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21029
April 29th, 2014 08:00
Free space merging
Hi, I have a md3200i, with 12x1Tb in raid5 disks with a big volume at the begining and some smaller ones after that, with some free space at the end:
volume1 8,192.000 GB
cluster2-vms 200.000 GB
cluster2-vms2 100.000 GB
proxmox4 5.000
proxmox5 5.000
proxmox6 5.000
proxmox7 5.000
My question is, if I were to delete volume1, would it be possible to expand cluster2-vms or cluster2-vms2 or the free space used to expand a volume must be contiguous?
DELL-Sam L
Moderator
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7.7K Posts
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April 29th, 2014 11:00
Hello Zoid,
If you have all the virtual disks in the same disk group then when you delete volume 1 the space will show under free space for the group. Once the free space is shown then you can assign it to any other virtual disk that you would like.
Please let us know if you have any other questions.
Dev Mgr
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9.3K Posts
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April 30th, 2014 06:00
On an unrelated note: a 12-disk raid 5 is not the best for reliability. Raid 5 should be limited to 6 or 7 drives max. When you go over this, I'd highly recommend going raid 6 (or raid 10 if performance is important).
Especially with slower drives (7200rpm), the rebuild time will be longer (12-24 hours is not unlikely) and the risk of another drive having an issue during this rebuild window is fairly real, and could cause you data unavailability.
zoid_
6 Posts
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April 30th, 2014 14:00
Dev Mgr: I wish I knew that before :(
The raid5 is actually composed off 11 drives and one left as hot-spare.
Is it possible to change this disc group to use that disk to upgrade to raid 6 ( as far as I understand raid6 is raid5 with an aditional strip of parity).