Vsan object space reservation

Vsan object space reservation. Sep 23, 2022 · Offer guaranteed capacity with reservations. e. They are powered off and the VM OVERRESERVED is 0. n. Resiliency: Number of failures to tolerate. The VM objects will be protected based on the vSAN Default Storage Policy configurations. In case there is enough free space in the cluster, vSAN might use more space than the operations threshold for the resyncing operations to complete faster. This is what the policy looks like: Replica Disk – Flash Read Cache Reservation = 10% Object reserved Includes the reservation for objects created with a policy that has specified object space reservation. For more information on Object Space Reservations, see the post: Demystifying Capacity Reporting in vSAN. More details can be found in KB 2121181. cmmds_find. vsan. Apr 20, 2020 · What are the vSAN storage policy settings applied to the VxRail Manager VM during initial setup? A. 5. Jan 13, 2015 · Those objects include the VM Home Namespace, VMDKs and of course VM Swap. I hope this script helps better use this advanced Virtual SAN 6. This alarm triggers when vSAN detects thick-provisioned VMs, which in my case was occurring despite the presence of Object Space Reservation = 0 (thin provisioned) in the applied vSAN Storage Policy. What are the vSAN storage policy settings applied to the VxRail Manager VM during initial setup*? A . One challenge to thin provisioning is that VMDKs, once grown, will not shrink when files within the guest OS are deleted. Jul 18, 2018 · In past versions of vSAN, while other objects were thin provisioned by default, the VM swap object has always been provisioned with 100% Object Space Reservation (thick provisioned). Object Space Reservation = Thin provisioning. It is used for the VM home files and operating system VMDK files of virtual machines created in this solution. The number of disk stripes affects how many magnetic disks you have (HDDs). Email Address . Click to edit the Reservations and Alerts. 2) During normal operation w hen VSAN is migrating/placing objects the vmdk's will be smaller. esxcli vsan debug disk. The administrator creates the policy using storage policy based management and assigns it to a 100GB virtual machine on a 4-node vSAN cluster to test the results of the new storage Number of disk stripes per object = 1; Object space reservation (%) = 0; This policy is the vSAN default policy. I have stated many times in the past that when a VM is deployed on the VSAN datastore, it behaves like it is thinly provisioned unless the capability ‘Object Space Reservation’ (OSR) is specified in the VM Storage Policy. To create a thick-provisioned disk, a Storage Policy must be used which has Object Space Reservation (OSR) set to 100% in its Rule-Set. Dec 8, 2020 · These soft reservations prevent the creation of new VMs or powering on VMs if such operations consume the reserved space. 09GB of swap space. This policy enables to configure per VM the following settings: IOPS limit for object: This setting enables to configure the IOPS limit of an object as a VMDK. Apr 21, 2020 · If it is the former then unfortunately you will need to SvMotion/Clone the VM to essentially create new Thin Objects, if it is just set at the SP level then you can just apply a SP with Object Space Reservation = 0 (or one without this rule at all which will default to it being 0) - provided you don't apply a SP with any other rule changes that Jan 16, 2024 · Provide enough temporary storage space for changes in the vSAN VM storage policy. Sep 10, 2013 · The reservation should be left at 0 (default) unless you are trying to solve a real performance problem and you believe dedicating read cache is the solution. May 31, 2019 · vSAN can eliminate duplicate data blocks within each disk group, but not across disk groups. This reservation is based on the N+1 host count recommendation. Object type Oct 29, 2020 · This reservation is set to one host worth of capacity. VMware vSAN provides a few dashboards for tracking capacity utilization, free space remaining, deduplication and compression efficiency, and more. IOPS limit for object = 0. Pre-filling zeros on VMFS had an advantage of avoiding “burn in” bottlenecks tied to metadata allocation. Those components can cross physical disks, disk groups and even hosts if needed. vswp-provisioning rule A. . It is not accurate to compare this to Zeroed Thick or Eager Zeroed Thick in the VMFS/NFS world as VSAN is an Object Store. From here, not only can administrators see the Jul 3, 2023 · A witness consumes approximately 2 MB of space for metadata on the vSAN datastore when using on-disk format 1. The deduplication and compression overhead is 6. Jun 13, 2017 · We see the disk as thick on the edit settings page in the details pane of the disks with the old c# client and with powershell "get-harddisk". If the VM should be using "Thin provisioning", see the workarounds below. hostfailuresToTolerate") -Value 1), (New May 12, 2024 · Note: There are no benefits from the default thin provisioning of the vSAN datastore. Click to enable or disable the host rebuild reserve. Jan 4, 2024 · If the resynchronization of objects is in progress in a cluster, vSAN displays the capacity used in the capacity chart as operations usage. Description. Replica 1 : 412MB Used Capacity Replica 2 : 412MB Used Capacity This is what I expect to see. When you dynamically change a VM storage policy, vSAN might create a new RAID tree layout of the object. esxcli vsan debug object. Jun 12, 2014 · Best Answer. One challenge to thin provisioning is that VMDK’s once grown will not shrink when files within the guest OS are deleted. Either way, it all depends on VM sizing and requirement. So there is a lot of room for flexibility. No data protection will be applied to the VM objects. I've powerd on just one VM That has 4GB RAM assigned. Once the reserved capacity is enabled, vSAN does not prevent powered on VM operations, such as I/O from the guest operating system or applications from consuming the space even after the threshold limits are reached. g. The 10 or so VMs that I have powered on are consuming 84. Jan 23, 2023 · In a vSAN environment, Virtual Machine Disk (VMDK) files are created as thin-provisioned by default. Noting the slack space reservation has been reduced to 12. Click to enable or deactivate the operations reserve. When vSAN instantiates and synchronizes a new layout, the object may consume extra space temporarily. The operations space needed by vSAN to perform policy change or other such operations on an object created by vSAN 7. 6 version. Dec 7, 2015 · The first is to use Object Space Reservation in the VM Storage Policy and allocate all of the space for the object up front. disks_info. To start the configuration wizard for either vSAN stretched cluster or two-node, navigate to [Cluster] > Configure > vSAN > Services and pick the appropriate option: Follow the screens to configure the disks, as per a standard vSAN cluster. Policies with 100 percent object space reservations are always honored, but can make deduplication and compression less efficient. 7 Patch Release ESXi670-201912001) – release date DEC 5, 2019 Dec 7, 2023 · Stripes: Number of disk stripes per object. One additional consideration is that it makes it speedier to place a host in maintenance mode, as their will be less data to rebuild/evacuate. 2 feature to reclaim some space. In this case, we are reserving all of the space for the persistent disk in advance. I have deployed a new server 2016 guest from a template with hardware version v14 and latest vmware tools installed. The vSphere Web Client will choose the last vSAN Storage Policy used. Object space reservation changes the how vSAN handles thickness for the VMDK. Debug vSAN physical disks. However VSAN can have 1 VMDK which is an object consisting of multiple components. Select StripeWidth=2 policy from the list of available policies, and then the Edit Settings option. Expose Correct Answer. Please note that this is not the default storage policy applied to the cluster. This has some drawbacks, since it tended to consume… To fix this issue, ensure the storage policies are not set for object space reservation: 100% (Thick provisiong): Click Menu > Policies and Profiles > Click VM Storage Policies > search for the vSAN Storage Policy or the custom policy used and select it, this will display the policy details and show it has 100% reservation: Workaround: Aug 17, 2020 · Note: The numbers above do not factor in potential reductions in raw capacity consumption as a result of thin-provisioning (vSAN Object Space Reservation set to 0%, which is the default setting) or enabling vSAN Deduplication and Compression. Storage Reservation: Object space reservation. Feb 16, 2015 · Yes - those are definite valid reasons for leaving the VM objects as thin. Jan 14, 2019 · January 14, 2019. This is configured by default using the Storage Policy Based Management (SPBM) policy of Object Space Reservation (OSR) being set to 0. Jan 10, 2024 · Provide enough temporary storage space for changes in the vSAN VM storage policy. This is typically difficult to plan for and hence the guidance was to keep 30 percent of free space in the cluster assuming that it is The “object space reservation” policy setting defines how much space is initially reserved on the vSAN datastore for a VM's objects. Monitoring deduplication and compression space-saving. What if analysis enables you to estimate the effective free space while keeping the Dec 9, 2019 · In vSAN , the Eager Zero thick attribute can be controlled by a rule in the VM Storage Policy called ‘Object Space Reservation’ which need to be set to 100% which pre-allocates all object’s components on disk. Debug vSAN objects. provisioned. Now the VM OVERRESERVED is 8 GB and in the used capacity breackdown I see swap object is 8 GB that is correct because we have 2 copy of the VM objects. Jun 3, 2016 · Note: When referring to Thick provisioned in VSAN (proportionalCapacity = 100), It is defined as provisioned Thin with a reservation so there is a guarantee that space is available for the object. Navigate to vSAN > Advanced Policy Rules and modify the Object space reservation setting to 25%, as shown below Nov 16, 2020 · If the VM should be using “Thick provisioning”, please apply a Storage Policy to the VM with the vSAN option “Object space reservation” set to 100 (Thick provisioning). vSAN requires that the virtual machines deployed on the vSAN datastores are assigned at least one storage policy. In future post we will see on How to Enable the Deduplicaiton and Compression on the vSAN. Keep some temporary storage space in the cluster to Mar 1, 2017 · (Objects with a Storage Policy rule of 100% Object Space Reservation) This can also occur due to being cloned/deployed from template that has thick-provisioned disks (though even default Storage Policy may show, this may not be applied in reality), reservation space per disk can be seen using this command via RVC at the cluster level: #vsan Nov 17, 2017 · With the release of PowerCLI 6. If All policies are set to zero, this may still show capacity still reserved. If one disk has reached 80%, vSAN will automatically remediate the situation. Flash read cache reservation (%): This setting is useful only in hybrid vSAN configuration (SSD + HDD). HTH Cormac Aug 19, 2020 · Having an EZT disk won’t necessarily improve vSAN performance the same way it does for VMFS. B. vSAN maintains a quorum by using an asymmetrical voting system where each component might have more than one vote to decide the availability of objects. If the vSAN datastore in the target site does not have extra space to accommodate the double sized VMs, a planned migration or a test recovery can fail. When the VM is powered on, the swap object will be created with 0 byte address space, but the components will not have (1<<27) flag. Number of failures to tolerate = 1; Failure tolerance method = RAID 1 Disable object Object Space Reservation: Reserves the specified percentage of the disk space for the VM (assuming it is thin provisioned); it does not thick-provision the space, but rather uses the calculated space as if it were already provisioned in much the same way that a CPU or memory reservation is used in compute calculations used by vSphere, HA, and DRS. As the first step, note the amount of free space in the vSAN datastore. If you want to preserve storage, thin is the way to go. Object Space Reservation: If you configure the Object space reservation then reservation will be done on the vSAN Datastore for the specified object or the VM on which this policy is assigned. This means that the VMDK is not thinly provisioned and that its disk space is reserved up front, so VSAN will chunk up the 255GB VMDK into multiple RAID-0 components and distribute them on multiple physical disk drives if Mar 23, 2017 · If you want to see this on your own vSAN, you will have to use the Object Space Reservation setting of 100% to achieve this (along with the necessary disk capacity of course). Jul 9, 2018 · Stripe width and object space reservation policy rules, as well as environmental factors such as cluster host count, the growth of thin provisioned VMDKs and physical device capacity usage, can impart changes in how and where components live on hosts across a vSAN cluster. I now powered off the VMs, and made the /VSAN/SwapThickPrivisionDisabled advanced setting changed on the ESXi hosts. Primary level of failures to tolerate = 1 Failure tolerance method = Erasure coding Object space reservation (%) = 100 B. Sep 16, 2013 · Object Space Reservation is all about the numbers used by VSAN when calculation used disk space / available disk space etc. Setup:vsan Stretched cluster running esxi 6. By default, it is set to "Thin provisioning", implying that the VM’s storage objects are entirely “thin” and consume no unnecessary space. Click to enable or deactivate the host May 7, 2020 · 1. C. Primary level of failures to tolerate = 1 Failure tolerance method = Erasure coding Object space reservation (%) = 100 B . VM Powered On. Then chose the vSAN witness host: Dec 25, 2018 · vSAN by default uses thin provisioning for VMs that are on vSAN datastore as the SPBM Policy for Object Space Reservation is set to its default of 0%. vm_object_info. By default, it is set to "thin provisioning", implying that the VM’s storage objects are entirely “thin” and consume no unnecessary space. The VM provisioning will fail. Primary level of failures to tolerate = 1Object space reservation (%) = 100 C. Jan 23, 2018 · This is the result of object space reservations being set to larger than zero. 02GB used Capacity This is where I might not have had enough coffee to figure out yet. Oct 15, 2017 · New-SpbmStoragePolicy -Name OBS -AnyOfRuleSets (New-SpbmRuleSet (New-SpbmRule -Capability (Get-SpbmCapability -Name "VSAN. VSAN 6. 2. ps1 which includes a function called Get-VSANVMThickSwap to retrieve the exact same information as the Python script. Mar 19, 2015 · Its only when you select an actual VM Storage Policy when deploying a VM that VSAN uses the Object Space Reservation capability, which by default is 0%, meaning that the VM is effectively thinly provisioned. A component sits on a disk. Sep 21, 2016 · To be deployed in the vSAN cluster, the VM must be bound to a VM Storage Policy. May 12, 2024 · Conditions For 0 Byte Object with (1<<27) Flag. 0 with the introduction of Reducing the object space reservation policy can free up space without the need to delete or move any data; Used - Total: Space not available for new allocations; Used - vSAN system overhead: Capacity consumed by vSAN for system needs. In the initial version of VSAN, there is no proportional share mechanism for this resource. 2 has introduced a new section to the UI called Capacity views. This would help ascertain the impact of the change in the policy. Jan 13, 2020 · A standard vSAN cluster supports between 3 and 64 hosts. Else go for thick. Dec 27, 2017 · vSAN storage polices define storage requirements for your virtual machines. Feb 27, 2020 · vSAN 8 node cluster summary: Nutanix 8 node cluster summary: Again we see vSAN still has a LOWER usable capacity than Nutanix, but in this case it’s now 41. a policy with Object Space Reservation / OSR = 100%). I guess you can compare it to a memory reservation. The object space reservation is 0% with default VSAN Storage policy. "Issue":When I try to create a VM storage policy with object space reservation set to 25, 50 or 75% t May 12, 2024 · For example, if Object Space Reservation in the storage policy is set to 100 (= 100%), the usage of the vSAN datastore by the target VM becomes double compared to the original VM. If the VM should be using "Thick provisioning", please apply a Storage Policy to the VM with the vSAN option "Object space reservation" set to 100 (Thick provisioning). 21 Questions] An organization wants to configure a new storage policy based on the following requirements: Failures to tolerate = FTT 1/RAID-5 (Erasure Coding) Number of disk stripes per object = 8. Force provisioning = No. Aug 8, 2022 · I was alerted to this by a vSAN online health check, as the “Thick-provisioned VMs on vSAN” alert tripped. Thanks. Feb 22, 2016 · The first screenshot here is the capacity view grouped by object type. An administrator should always be aware of over-committing storage on vSAN, just as one needs to monitor over-commitment on a traditional SAN or NAS array. As expected, there are Aug 22, 2023 · Navigate to the vSAN cluster. disks_stats. It totally depends on your requirement. By enabling the advanced “SwapThickProvisionedDisabled” host setting, swap files would be provisioned thin and disk space only claimed when the swap file is When you log on to the vSphere Client, you may notice a VM Storage Policy called vSAN Default Storage Policy with Object Space Reservation set to Thick provisioning. By default all VMs provisioned to a VSAN datastore have object space reservation of 0% (thin provisioned) which leads to space savings and also enables vSAN more freedom for placement of data. The third part explains commands related to the object management in vSAN. Jun 13, 2023 · This is a vSAN Default Storage Policy … policy. If you want to change the setting back, the (another) script will change the setting back to the default. vmdk and . The ‘used-total’ grows up to about 2 TB after enable Dedup and compression. This means that if one host in the vSAN cluster fails and no longer contributes storage, there is still sufficient capacity remaining in the cluster to rebuild and re-protect all vSAN objects. To use vSAN thin provisioning, set the SPBM policy for Object Space Reservation (OSR) to its default of 0. We realized that this was causing some issues for customers so we improved this whole deployment mechanism in 6. Primary level of failures to tolerate = 1 Object space reservation (%) = 100 C . Apr 6, 2016 · The persistent disk has an object space reservation value set to 100%. When Object Space Reservation is set to 100% on a disk of 25GB then this disk will be a thin provisioned disk but VSAN will do its math with 100% used of 25GB. Apr 28, 2018 · Policies must have either 0 percent or 100 percent object space reservations. Question #: 46. If you do not see deduplication or compression at all: See if the object space reservation policy has been set to above zero, as this reservation will effectively disable the benefits of deduplication for […] Aug 16, 2017 · Object Space Reservation (thin or thick provisioning) The name for this setting comes from vSAN using objects to store components of your VMs (VMDKs etc). There are two types of capacity breakdown, object types and data types. Workaround: Option 1: Schedule downtime for the VM and perform a clone within the vSAN datastore. VM shows as compliant. I have a newly configured VxRail all flash appliance running ESXi 6. Topic #: 1. This policy exists for historical purposes and will eventually be modified to Thin provisioning. By default, virtual machine storage objects deployed on vSAN are thinly provisioned. May 12, 2024 · vSAN attempts to balance the space usage of disks when they reach 80%. Pre-allocating the space for SQL Server logs can reserve the space to avoid the out of space issue. Feb 12, 2016 · With this option, VSAN removes components from the objects, rebuilds the disk group with the new on-disk format, and rebuild the component before moving onto the next step. They also provide an insight on how vSAN works. Are these valid? 1) In the event of a host/disk/ssd failure there will less data to migrate around the cluster. Under vSAN, select Services. VMware vSAN 6. Click Configure tab to enable the capacity reserve. Click the Configure tab. Object Space Reservation . In certain scenarios, it may be necessary to pre-allocate all of the VMDK space, or thick-provision the disk. 4 today, this issue has now been resolved and I have created the equivalent PowerCLI script called VSANVMThickSwap. If used capacity seems higher than it should be, look below at the used capacity break down. To use the function, you simply pass in the name of a vSAN Cluster as shown in Apr 1, 2024 · The esxcli vsan debug commands can help you debug and troubleshoot the vSAN cluster, especially when vCenter Server is not available. D. This capacity is not actually used by the objects. Some background into your current infrastructure (Physical server model, Disk group configuration Feb 15, 2015 · Other than the obvious situation of being able to over provision your storage, something I don't actually need to do. Subscribe to Blog via Email. vswp file space reservation policy change from 100% reserved to 0% reserved. The number of host failures to tolerate depends, of course, on the number of hosts you have. 5% (N+1) Next up, 4 node cluster comparison: Now let’s look at the usable capacity for vSAN: The “object space reservation” policy setting defines how much space is initially reserved on the vSAN datastore for a VM's objects. VM must be provisioned with a full memory reservation. Enter your email address to subscribe to this blog and receive updates of new posts by email. The guideline of approximately 25-30% of total capacity remain free applies to clusters of all sizes. Greater than 50 percent of Jun 8, 2020 · Stripes: Number of disk stripes per object. Aug 27, 2020 · About vSAN Object Format. If object space reservation is increased on the fly, for example, while moving from 5 percent to 10 percent object space reservation (which would mean creating a new policy) and the policy is then applied to the virtual machine, a new object will then be created and a Mar 8, 2019 · Hi, I don't think there's best practice for Object space reservation (%). 7U1, all flash. Since vSAN deploys objects thinly, if you do not use OSR=100%, you will only see the bare minimum 4 components in the RAID-5 object. Stephan. Keep some temporary storage space in the cluster to Mar 26, 2019 · Set object space reservation – “Thick provisioning” for all VMDKs hosting SQL Server data and log files. Primary level of failures to tolerate = 1 Failure tolerance method = Mirroring Object space Nov 1, 2017 · I’ve been getting some questions lately and here are a few quick thoughts on getting the most out of this feature. I see many post in this forum and I check Sep 10, 2018 · For a thin virtual disk, vSAN provisions the entire space required for the disk’s current and future activities, but commits only as much storage space as the disk needs for its initial operations. Used Capacity Breakdown. 7 P01 (ESXi 6. Upon closer inspection you’ll notice that the Object space reservation is set to thick provisioning. Disable object checksum = No. User created Splunk-Data-Policy. In this, case it is often the result of object swap which defaults to 100%. Feb 24, 2016 · Keep in mind that VM’s will have to be powered off to have the . Object Space Reservation. With vSAN (ESA and OSA), Object Space Reservations can be applied using a storage policy and is a capacity management technique to ensure the VM(s) using OSR are guaranteed their capacity. Replica 1 : 412MB used Capacity Replica 2 : 1. A factor to consider is how well the components are balanced on the capacity tier disks. Jan 30, 2020 · - If the Object is either Thick-provisioned from the vmdk primitive level (e. ClomMaxComponentSizeGB option. vSAN Capacity Management and Monitoring Series. An object exists of multiple components. Controls how much storage is set aside Dec 4, 2020 · Находим там «Object space reservation» и в выпадающем меню выбираем нужное значение, отличное от предыдущего: Далее идем по пунктам визарда, не меняя более ничего, пока не закончим редактирование по Oct 3, 2017 · So the Object Space Reservation rule is 0% or simply not present in your applied Storage Policy, correct? Also how many VM's/and how much RAM is being reserved in a vSwap file for each VM? 10 VM's w/4GB of RAM each will consume 80GB of vSAN capacity. Use: esxcli vsan debug {cmd} [cmd options] Debug commands: Command. Despite of doing the action via vSphere Web Client to repair objects inmediately, did not work. We have tested one workaround: move the vm back to vmfs storage and select thin as disk format and then move the vm back to vSAN cluster again. May 1, 2018 · Virtual SAN fails to provision a virtual machine when the policy requirements are not met, but it successfully creates the user-defined storage policy. The actual default storage policy setting for stretched clusters is set to RAID-1 FTT-1 Dual Site, with Object space reservation set to Thin provisioning. Controls how much storage is set aside 3. The OSR will pre-allocate space on the VSAN datastore for the May 12, 2024 · However, if the smallest free space available on any capacity tier disks is less than object size, in this case, CLOMD will attempt one or more iterations to split replicas into smaller equal stripes that best fit on the free space of the capacity tier disks. May 31, 2019 · The esxcli vsan debug commands can help you debug and troubleshoot the vSAN cluster, especially when vCenter Server is not available. These policies determine how the virtual machine storage objects are provisioned and allocated within the datastore to guarantee the required level of service. All objects deployed on VSAN are thinly provisioned. Jan 22, 2024 · These soft reservations prevent the creation of new VMs or powering on VMs if such operations consume the reserved space. With an FTT=1 FTM=RAID1 Storage Policy Storage Policy (as is the default and as you have here), any . Is that the normal phenomenon after enable the feature? Jun 12, 2017 · All commands are from the latest vSAN 6. [All 5V0-22. Checkout Our Posts on vSAN: What is VMware vSAN ? IOPS limit for object = 0. On enabling the operations reserve, vSAN ensures that the cluster has enough space to complete the internal operations. Click to enable or disable the operations reserve. However, future deployments that do not use the object space reservation policy are thin provisioned, and their objects utilize the maximum component size defined by the VSAN. All objects deployed on VSAN are thin, in other words object space reservation is set to 0%. But the VM May 4, 2018 · Hello jvm2016 ,. The capacity will be reserved up front from the vSAN datastore. The swap object goes through a configuration change due to one of the following conditions: May 12, 2024 · Symptoms: VMware is aware of a scenario where after a host reboot, vSAN will initially show a significantly higher amount of used space on a deduplicated disk group when using “thick” objects (i. First off, vSAN has it’s own control of space reservation. May 2, 2016 · In an empty barand new cluster I've deployed 2 VM withe the default policy. Navigate to the vSAN cluster. This is an estimation of space necessary to perform transient activities, and in typical scenarios is also enough room for a single host rebuild to provide basic N+1 functionality. These commands are used for troubleshooting or reconfiguration of objects. Object Space reservation % : 0 Flash Read Cache reservation : 0 VM Powered Off. vSwap files are currently mirrored by default, and have a 100% space reservation. But from what i saw is that: 1. This is using the default Object Space Reservation = 100%. With VSAN a disk is an object. the Object Space Reservation policy OSR=100% (Thick) or OSR=0% (Thin). vswp, this can be changed to thin but not via Storage Policies but the default . 0, and 4 MB for on-disk format version 2. 0 and later. Capacity overhead for deduplication and compression is approximately five percent of total raw capacity. VM Swap is interesting, in that it only exists when the VM is powered on, but on VSAN it has always been provisioned with 100% Object Space Reservation in the past. EZT) or via Storage Policy being set to Object Space Reservation = 100 "VM vmdk (stored on vSAN and default storage policy) and viewed via vCenter datastore file browse shows around 150GB" May 13, 2014 · In this post, we talk about a particular behaviour with using the default (or None) policy with VSAN. Policies must have either 0 percent or 100 percent object space reservations. If all the physical disks are using greater than 80% of their capacity, vSAN still tries to keep the amount of consumed capacity balanced. Reserved capacity Includes the operations reserve and the host rebuild reserve. Flash read cache reservation = 0%. vsan object space reservation. 0 or earlier is the space used by a largest object in the cluster. Resync components in vSAN takes a long time! I have a vCSA + 3 ESXi on same cluster and a few days ago, I checked status in vSAN and I see that many components takes very long time to succesfully resync. vswp data Objects will use twice the space they are provisioned on vsandatastore - however this is thin-provisioned for . vmdk by default and Thick by default for . 7 build 13004448. 5TB. 25% lower for the exact same hardware. The VM as well as the template have the default vsan storage policy applied with object space reservation set to 0 - Thin. jl dg vx sg it rk wo cs ua qh