On 1 March 2017 at 09:20, Ernie Dunbar <maillist@xxxxxxxxxxxxx> wrote:
Every node in the Gluster array has their RAID array configured as RAID5, so I'd like to improve the performance on each node by changing that to RAID0 instead.
Hi Ernie, sorry saw your question before and meant to reply but "stuff" kept happening ... :)
Presuming you're running Replica 3 I don't see any issues with converting from RAID5 to RAID0, there should be quite a local performance boost and I would think its actually safer - the rebuild times for RAID5 are horrendous and a performance killer to boot. With RAID0 you'll loose the whole brick if you lose a disk but depending on your network, healing from the other nodes would probably be quicker.
nb. What is your raid controller? network setup?
Alternatively I believe the general recommendation is to actually run all your disks in JBOD mode and create a brick per disk, that way individual disk failures won't effect the other bricks on the node. However that would require the same number of disks per node.
For myself, I actually run 4 disks per node, setup as RAID10 with ZFS. One ZFS Pool and Brick per node. I use it for VM Hosting though which is quite a different usecase, a few very large files.
--
Lindsay
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