Re: Is it safe to run RAID0 on a replicate cluster?

Ernie Dunbar <maillist@xxxxxxxxxxxxx> · Wed, 1 Mar 2017 13:52:45 -0800



    On 2017-02-28 04:01 PM, Lindsay Mathieson wrote:

    
          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.

        
    We're running Gluster on 3 Dell 2950s, using the PERC6i controller.
    There's only one brick so far, but I think I'm going to have to keep
    it that way, although some of our data on that brick isn't mail - VM
    hosting is something that we'll be doing with this very soon.

    
    Considering that this is our mail store, I don't think that setting
    up JBOD and a brick per disk is really reasonable, or we'd have to
    go around creating new e-mail accounts on random gluster shares,
    nevermind the tiny detail of what happens when any set of mailboxes
    outgrows the brick. This makes it look like this more efficient
    scheme would be highly impractical to us.

  
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