Is it safe to run RAID0 on a replicate cluster?

Ernie Dunbar <maillist@xxxxxxxxxxxxx> · Tue, 28 Feb 2017 15:20:05 -0800



    Hi everyone!
    I've asked this question before, but I don't think my subject
      line got the right people's attention, so apologies for
      re-posting.
    We've got a mail server with about 10,000 e-mail accounts, all
      sharing their Maildir mailboxes on our 3-node Gluster array
      configured as a replicated volume. The performance of this Gluster
      share is quite poor, and it takes a long time to fetch peoples'
      mail, especially when they're using webmail.
    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. I think that that Gluster's data
      replication is good enough to keep our data from being lost in the
      event of a disk failure, but I want other people's opinions on the
      matter before we go doing something so drastic. At the very least,
      I need someone's opinion on this particular subject before we do
      anything.

      
      One other person has recommended some Gluster settings to improve
      Gluster performance for small files, but considering the IO and
      CPU overhead of Gluster, I'd have to wonder about its usefulness.
      

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