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VMware and SAN storage

Posted on 2011-09-19
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Last Modified: 2012-05-12
If I look at my LUNs on the SAN that are associated with VMware it adds up to 2.8 TB
When I log into Vcenter Server and on the cluster I click on the Storage Views tab and add up all the VM space it equals 2.0 TB. Whats happened to the other 800 GB missing?
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Question by:tolinrome
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LVL 118
ID: 36563736
Do you have any snapshots on the VMs?

Some space is allocated to the metadata on the datastore.
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by:tolinrome
ID: 36563763
Ok, let me be a litte more detailed.

3 LUNS that total 2.8 TB capacity
Used is 2.4 TB
All the VM's totaled individually are 2.0 TB

So thats 400 GB in question.

20 GB on a snapshot which brings it down to 380 GB in question.

How much space would be allocated to metadata on the datastore and what does that mean specifically?
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LVL 118
ID: 36563793
if you look at the root of the datastore, you will find a bunch of files - these are the metadata descriptor files for the datastore - do not delete.

these are hidden from the datastore browser view, but if you check the datastore through the console, you will see them.

the best thing to do is to check each datastore at the console. use the ls -al to list files
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LVL 118
ID: 36563800
Do the totals of the datastore add up to 2.8T? in the vSphere Client?

what do the used figures for each datastore?
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LVL 118
ID: 36563811
ls -al within the datastore lists metadata files for the VMFS3 volume.

 

.fdc.sf - file descriptor system file

.sbc.sf - sub-block system file

.fbb.sf - file block system file

.pbc.sf - pointer block system file

.vh.sf - volume header system file
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Author Comment

by:tolinrome
ID: 36563835
yes, in the vsphere clinet on the datastores the total add up to 2.8TB.

and the used all add up to 2.4 TB.

I'm not sure how to view them through the console. Just strange how 380 GB is unaccounted for.
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Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE) earned 250 total points
ID: 36563847
without checking the VMFS volume on the console, it's difficult to comment.

you can also use df and vdf to check disk usage.

to access the console, you can SSH from a workstation, but you would need to enable SSH on the host server, or access it from the KVM.
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Author Closing Comment

by:tolinrome
ID: 36567316
I also called vmware and they mentioned that swapfiles, logs, virtual memory, overhead functionality etc will take up disk space as well and this may be why the numbers dont match exactly.
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