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September 18th, 2014 03:00
volume on Equallogic PS6110
Hi.
I have a 2 TB volume on Equallogic PS6110. 400 GB is used by virtual machines, but EL generated message that I have 9 % free space on the volume. How to cleanup a volume or to get an accurate real statistic about storage occupation.
Thanks
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DELL-Joe S
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September 18th, 2014 08:00
There is a knowledge base article on the EqualLogic Support site that explains why the OS will display the actual volume size and the array has a different measurement. (Onced logged in to the support site, go to the KB, and do a search on “ARRAY: GUI space usage differs from what the OS shows”
In short, the array is a block level device, and has no knowledge of the OS file system. As the application data grows these are writes to the array. If later the application frees up space, the space is not marked as unused in the PS Series GUI, and is the reason for the difference in views between the OS/file system and the PS Series GUI.
In order to tell the arary to clear the unused blocks, the volume will need to be thin provisioned, with no snapshots, and NOT replicated, when you run SCSI UNMAP from the Host. The host OS will need to support the SCSI UNMAP or Retrim commands (version of ESXi 4.x and above and Win12 support this, if using Win2K8 the EqualLogic HIT/ME has a utility called EQLRethin that will clear unused blocks).
-joe