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jason_mills
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June 3rd, 2014 06:00
Removing a LUN from AVM - VNX 5500 Unified
VNX 5500 Unified
The entire array is being used for file and was setup with 3TB Disks/RAID 6 with 8 disks per group. Somehow through a wizard we ended up with one group that has only 6 drives and we have 2 left unbound. Instead of two 8TB LUNs we got one 8TB and one 2.5TB LUN. These LUNs are part of the Storage Pool for File. I am trying to figure out how I can possibly get those other two disks involved to get the missing space back. Any ideas?
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Posted June 3rd, 2014 06:00
Yes they are already in use. I was trying to figure out if there is a way I could create new file systems (without using those LUNS), move the data, remove those file systems & the LUNs so they could be rebuilt. Not sure if thats even possible.
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Posted June 3rd, 2014 07:00
We do have an SR open for this currently, but support told us it would need to be a PS engagement hence why I am looking for information on my own.
We actually have this problem on two arrays. One where there are 10 disks available currently (enough for another raid group, plus the 2 that were left out). The other array only has the two left out disks available.
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Posted June 3rd, 2014 07:00
how big are the file system that got created on the new LUNs ? I was thinking what if you had a couple of extra drives, create user-defined pools (you will need to validate supported raid types), create new file systems from this pool, then use server_archive or replicator to migrate the data. Delete file systems from incorrectly configured RG/LUNs, reclaim LUN, rebuild RG and re-represent. That of course depends if you have some extra drives laying around, or maybe create LUNs on VAULT drives (since this would be temporary swing space). Just throwing ideas out there
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Posted June 3rd, 2014 07:00
i don't think with AVM you can control file system placement, maybe support has some tricks up their sleeve.
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Posted June 3rd, 2014 08:00
Free up the dvols and delete the raidgroup
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Posted June 3rd, 2014 10:00
Is there a process around freeing up a dvol or do I have to do research to find anything use it and then figure some manual way to move it?
I saw the nas_vol -shrink command, but I can't find out if that is only for empty volumes or if this is what I am looking for.
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Posted June 4th, 2014 07:00
Find out which file systems use these dvols and move them to other dvols (Replicator, emcopy,…)
See /nas/tools/whereisfs, nas_disk, nas_fs ….
Once you delete the file systems the dvols should show as not in use
dynamox
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408
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Posted June 3rd, 2014 06:00
you can't add them now, do you know if new files systems (including snapshots) have been placed on the new LUNs ? if you run nas_disk -l you will see the LUNs and "in_use" column will tell you if they are part of the pool and being used. storageID-devID column tell you the LUN id (in hex), convert that to decimal to help you identify the LUNs and corresponding raid groups.