Re: [Gluster-users] Backup bricks?

Avra Sengupta <asengupt@xxxxxxxxxx> · Mon, 17 Aug 2015 18:32:40 +0530



    Yes for long term backups LVM snapshots
      might not be the solution. There is no side effect in backing up
      the bricks. The data would indeed be readable. And if you back up
      "/var/lib/glusterd/vols/<volname>" on each volume as well,
      you can effectively recreate the volume from the bricks at a later
      stage.

      
      Regards,

      Avra

      
      On 08/17/2015 04:11 PM, Thibault Godouet wrote:

    
      Thanks Avra.
      I am aware of the Gluster snapshots, but didn't think
        about using them on the offsite replica.  That could indeed
        cover the short term backups, and be used to do longer term
        backups from.
      What I perhaps wasn't clear about is that we'll need
        longer term backups to tape (e.g. to keep multiple years).  I
        don't think keeping LVM snapshots for that long would really
        work.

        So basically my initial question was on whether backing up the
        brick instead of the volume, which would be significantly
        faster, would be a good idea: would the data be readable ok? Any
        known side effect that could cause issues?
      On 17 Aug 2015 10:12 am, "Avra Sengupta"
        <asengupt@xxxxxxxxxx>
        wrote:

        
            Hi Thibault,

              
              Instead of backing up, individual bricks or the entire
              thin logical volume, you can take a gluster volume
              snapshot, and you will have a point in time backup of the
              volume. 

              
              gluster snapshots internally use thin lv snapshots, so you
              can't move the backup out of the system. Also having the
              backup on the same filesystem as the data doesn't protect
              you from device failure scenarios. However in events of
              any other data loss or corruption, you can restore the
              volume from the snapshot, mount the read-only snapshot and
              copy the necessary files. 

              
              In order to take backup at a remore site, using geo-rep is
              recommended.

              
              Regards,

              Avra

              
              On 08/17/2015 02:27 PM, Thibault Godouet wrote:

            
              I have a 1 x 2 = 2 volume geo-replicated to a
                single-brick volume in another physical site, where I
                would like to set up a backup.
              I could setup a backup on a mount of
                the volume, but a quick test shows it is slow in this
                setup (presumably because there are loads of small files
                on there).
              Instead I thought I could maybe backup the
                filesystem where the brick is (or rather a snapshot of
                the thin logical volume).  My understanding is that all
                the files will be in there, and readable, so it seems to
                me it would be fine to back things up from there.
              Is that right, or am I missing something
                here?
              Note the .glusterfs directory would also be
                backed up too, although I'm not sure whether that would
                be of any use in a backup.
              More generally is there a recommended way to
                setup backups?
              Thanks,

                Thibault.
              

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