LUN showing sufficient free space but VMware showing low on space!

Hello

I have a very strange problem on a loan SAN, I don't have on hand the model number for the moment, but it's a PS6000 with NL - SAS drives.

When I look in VMware to the DRLUN01 it seems that there is only 149 GB of free. When I look at the same SAN logical unit number, he says he has 985 GB free!

The SAN is running the latest firmware and is connected to a server ESXi 4.1.0 through iSCSI. The LUN contains replicas of Veeam my production systems. When I talked to Veeam they notify that they have seen this twice but only know that Dell has solved the problems.

As I'm not offered no support, even if I'm likely to spend August 20 k with Dell and have the Support Pro on my production SAN, I was wondering if someone can get ideas?

Thank you

Greg

If you have allocated (from the point of view ESX) all your space so it is a different matter.  ESX needs free space to work properly.  Temp files, the swapfiles, newspapers and snapshots of VMware.   For example, I usually create volumes of 600GO (in general), I leave at least 100 GB free.  If that gets close, I create a new data store and move the virtual machines or simply create the new on the new data store.

Re: ESX knows.   Basics of basic/SCSI disk.  At the level of the storage disk, there is no "files" there are only blocks.   Each block has an address, called a LBA, logical block addressing.  Each volume (disk) reports so that its ability to the controller.

The volume (disk) starts at LBA 0 and goes to the LBA The ESX server keeps a table of total blocks and when you make an entry, it selects and for use LBA.   LBA (and data) are written in the volume (disk).

The table knows also how each volume is great, so he knows how many blocks there.   ESX server sends that data with the LBA ESX choose to use, at the same time, it will update the allocation table which is on this VMFS volume...  The table can then locate LBA (X) and write the data here.

So, since you gave us (X) MB, we can infer that from the free space of the total volume.   Works fine as long as you never delete anything.   A removal of ESX is a WRITING on the VMFS allocation table.  We record this writing as others.   There is nothing to say the array, AMLA (X) is no longer used, so return to the Member's area.   This is where the new command comes in cancel the MAPPING.  Now the server can send a command that tells unallocate (free) LBA (X).   Use space will go down and free space on this member will go up.

Re: Re-use of Array.   So since it's the ESX Server that determines the LBA to use, it will be re - write down as needed.

Re: Free to the declaration space.  # Important indicator is what the operating system said, not the table.  Finally when SCSI UNMAP is indeed those two will be much closer together.   If a VMFS volume goes to 100%, you're in trouble.   ESX will no longer be a LBA list to choose from.  Entries will fail and VMs will go down.

The table in use is assistance to make sure that you attach no more space than you did.

That is if you had a table of 2 TB, you can create a volume thin MUCH bigger than available.  But up to what you actually write more than 2 TB, of a data value, you're fine.  If you do, then the table runs out of space and volumes to disconnect and all virtual machines would stop.  This gauge to judge when to buy more storage.

If w/o UNMAP, finally the EQL GUI does NOT reflect the free space for a volume.

Bottom line, follow what ESX (or any server) said being used and free space on a volume.

Best?

Tags: Dell Tech

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