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5382
May 9th, 2016 08:00
VNX Lun shrink option in Unisphere
I was just wondering if with the latest Flare code will we be seeing the option to 'Shrink' LUNS and not just 'Expand' LUNS in Unisphere. Provisioning 'Thin' LUNS can lead to an over provisioned capacity situation very easily, but then after performing 'house keeping' on the host we find a 2TB LUN now only has 300GB of data, so shrinking the LUN to 500GB makes sense which in turn would stop the VNX array from constantly complaining about being over provisioned.
Does anyone know if this functionality is or will be available in Block Code: 05.32.000.5.219
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dynamox
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20.4K Posts
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May 9th, 2016 20:00
not there and highly unlikely it's coming.
Rainer_EMC
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8.6K Posts
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May 10th, 2016 02:00
no
shrinking a LUN without being absolutely sure the host file system has evacuated the space and adjusted its metadata first would not be a good idea
m_makadmeh
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May 10th, 2016 04:00
There is NO shrink in Unisphere... Thin provisioning is the solution in your case and you need to keep an eye on the storage pools utilization ... The storage system automatically triggers an alert when the consumed capacity reaches the 85% full threshold value (you can change the threshold).
Otherwise, you can use the host's volume manager to shrink the filesystem (if supported).
e.g. set a quota on the filesystem if you use Solaris ZFS filesystem
e.g. use the vxresize command if you use VERITAS Volume Manager
davewhite23
2 Posts
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May 10th, 2016 04:00
Thanks for the answers. It looks like the best or rather only way forward is to create correctly sized LUN and get the data migrated into these LUNs using host based tools, then delete the original LUN.
Shame we can't resize LUN's in both directions would have saved a lot of time.