Storage and snapshot space views

Hi all

Among the new features of vSphere is the tab "storage views."  Click on an object in vCenter (for example, a cluster) and then click on the tab "storage views."

This tab includes useful information on the topic, including the amount of snapshot space which currently consumes each VM.  This is a great way to eyeball a cluster quickly and see what virtual machines are currently a snapshot.

My question is not a big problem - more a curiosity.  When I look at the tab "Storage views" I can see all virtual machines running on this group.  None of my virtual machines currently have a snapshot.  However, the amount of snapshot displayed for each virtual computer space varies.  Even say 1.08 KB, others say 633 B etc.  About three quarters of my virtual machines have a very low value like this (1 KB or less) with the remaining quarter actually list 0 B.

I would have thought that any virtual computer without a snapshot must be 0 b.

As I said, this isn't a big problem - just a curiosity.  It is still pretty easy to tell who the virtual machines have a real snapshot that you can ignore all those containing 1 KB or less space snapshot.  I expect always all VM without a snapshot to show 0 B well and I consider it a (minor) bug.

Does anyone else get these strange numbers?

See you soon,.

David

Did a little research on our environment and I think I know what you saw, we have a few shots in our environment but also show some VMs who have no snapshot with the display of 1.08 KB on the view of storage under use of snapshots, then I guess that its getting this information based on files located in the directory of the virtual machine. What I found to a specific VM has been there is a filed with an extension called .vmsd that contains the metadata about snapshots, also defined on VMwares Web site: http://www.vmware.com/support/ws5/doc/ws_learning_files_in_a_vm.html

The size of the meta file:

[root@himalaya Quentin]# ls -lha | grep .vmsd
-rw------- 1 root root 1.1K Jul 12 08:18 Quentin.vmsd

This metafile looks like the following (which I remember creation but via the CLI):

[root@himalaya Quentin]# cat Quentin.vmsd
.encoding = "UTF-8"
snapshot.lastUID = "127"
snapshot.numSnapshots = "0"
snapshot.current = "0"
snapshot0.uid = "127"
snapshot0.filename = "Quentin-Snapshot127.vmsn"
snapshot0.displayName = "BackupShot"
snapshot0.description = "Snapshot for Backups"
snapshot0.createTimeHigh = "290435"
snapshot0.createTimeLow = "-1325916361"
snapshot0.numDisks = "1"
snapshot0.disk0.fileName = "Quentin.vmdk"
snapshot0.disk0.node = "scsi0:0"

snapshot.needConsolidate = "FALSE"

snapshot1.uid = "101"
snapshot1.filename = "Quentin-Snapshot101.vmsn"
snapshot1.parent = "100"
snapshot1.displayName = "Snapshot-2-8:45"
snapshot1.description = "8:45am snapshot"
snapshot1.createTimeHigh = "287640"
snapshot1.createTimeLow = "-1172553953"
snapshot1.numDisks = "2"
snapshot1.disk0.fileName = "Quentin-000001.vmdk"
snapshot1.disk0.node = "scsi0:0"

snapshot0.type = "0"

snapshot1.type = "1"

snapshot0.disk1.fileName = "/vmfs/volumes/48e91a93-a0a8d3bf-f831-003048670887/Quentin/Quentin.vmdk"
snapshot0.disk1.node = "scsi0:1"

snapshot1.disk1.fileName = "Quentin-000002.vmdk"
snapshot1.disk1.node = "scsi0:1"

I also look at other virtual machines that are not instant and the size is more properly associated with it real snapshot deltas, although virtual machines without the clichés that the size of the .vmsd seems to fit with what is shown in the view of storage that you noted, these virtual machines have no snapshots. I think that if a virtual machine has snapshots at any given time and was afflicted with consolidation or remove, the .vmsd could not have been cleaned and then used as a benchmark as "thinking that it snapshots and uses the file size of the .vmsd.

This hypothesis was fairly easy to test, what I did to remove Quentin.vmsd (the virtual machine has been turned off, may want to be careful when his online) and what you need to do, is not to update the display of storage, but go to the virtual abstract machine and do a refresh on the use of the storage. This will refresh the specific data store on which this VMs lived on and if you return to the storage view and put a refresh/update, you will notice that the size of the snapshot goes to 0bytes now, which is pending.

So I think that explains which continues, perhaps a quirk or expected behavior. Yet once again, I agree that suits you just look for the use of delta< 1gb="" for="" real="" snapshots="" or="" you="" can="" always="" go="" in="" and="" clean="" up="" the="" .vmsd="" files="">

=========================================================================

William Lam

VMware vExpert 2009

Scripts for VMware ESX/ESXi and resources at: http://engineering.ucsb.edu/~duonglt/vmware/

repository scripts vGhetto

VMware Code Central - Scripts/code samples for developers and administrators

http://Twitter.com/lamw

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