Use of specified space

Hello

SAN HQ and EqualLogic Group Manager report only one space left 10% on one of our 6210xs EqualLogic volumes. We have two virtual machines in VMWare with thin disks residing on this volume. No snapshot used or reserved space.

The vSphere client reports a different amount of space left (a lot more).

I understand that a block storage device may not be aware of the correct amount of beeing used space on the OS volume. Is this correct?

If so, I wonder why this feature (use of space show) has been implemented at the forefront in storage management if it does not work reliable at this level?

Should I disable instead all kinds of reports of volume and warnings to the storage layer and delegate this function to the OS (in my case create respective alarms in vsphere client for the use of space)?

Thank you very much.

Best regards

Martin

Hello Martin,

Re: Values EQL GUI.  This is the correct behavior.  By default block storage devices are not informed when a file is deleted.  A deletion is a writing on an allocation table maintained only by the file system of the OS.

There is a new SCSI command that support more in addition to file systems.  CANCEL THE SCSI MAPPING.  AKA space Reclaim.  When a file is deleted, the host sends the command cancel with the departure of LBA MAPPING and the number of blocks after that for free.  EQL spatial rupture in the pages of 15MB, when an entire page is not assigned, he returned to the free space on a thin provisioned volume.  If the volume is thick put into service just use space will drop.

Part 2.  When VMware creates a 40 GB VM, even with thick VMDK provisioned, it is not actually write 40 GB.  No where close actually.  She however deduct 40GB of the allocation table in the VMFS data store.

If you do not use the EQL (async or sync) replication, you can free up space manually using the CLI utility.

For version 6.0 and ESXi v5.5 here's how to run this utility.

https://KB.VMware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalID=2057513

Kind regards

Don

Tags: Dell Products

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