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VMware and SAN storage

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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tolinrome
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tolinrome
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you have any snapshots on the VMs?

Some space is allocated to the metadata on the datastore.
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tolinromeAuthor Commented:
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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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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tolinromeAuthor Commented:
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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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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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tolinromeAuthor Commented:
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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