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4829
April 8th, 2016 00:00
Space utilization reported
Hello,
SAN HQ and the EqualLogic Group Manager report only 10% left space on one of our EqualLogic 6210xs volumes. We have two VMWare VMs with thin disks residing on that volume. No snapshot space used or reserved.
The vSphere client reports a totally different amount of space left (much more).
I understand that a block storage device cannot be aware of the correct amount of space beeing used on the volume by the OS. Is that correct?
If so, I ask myself why this function (show space utilization) was implemented in first place in storage managers if it cannot work reliable at this level?
Should I instead deactivate all kind of volume reports and warnings at storage layer and delegate this function to the OS (in my case create respective alarms in vsphere client for space utilization)?
Thanks a lot.
Best regards
Martin
martin79_
3 Posts
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April 11th, 2016 05:00
Hello Don, thanks for your reply. The EQL volume itself is not thin provisioned, its 2TB fixed.
Like I have never paid attention to this kind of behaviour I just moved some data from one volume to another volume and compared the values before and after the operation to better understand whats happening.
The values shown at VMWare level are just like one would expect. The free capacity on the source is increased by the exact same amount that will be decreased on the target.
The values shown in the DELL Group Manager dont behave like I expected. Okay, the Group Manager does not reconize if data is taken FROM a volume - the free capacity stays the same at the source. But the strange thing now is that the value on the target does not increase by the amount of data I copied to it. For example if I add a 40GB VM it would add only 25GB.
What would be the explanation for this?
Regards
Martin
martin79_
3 Posts
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April 14th, 2016 00:00
Hello Don, thank you, I'll try that.