Re: Sync two disks and hot swap

From	David Christensen <dpchrist@holgerdanske.com>
Newsgroups	linux.debian.user
Subject	Re: Sync two disks and hot swap
Date	2017-11-10 00:10 +0100
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On 11/09/17 14:46, Bob Weber wrote:
> On 11/9/17 2:01 AM, David Christensen wrote:
>> Okay.  What RAID technology were you using -- LVM, mdadm, btrfs, ZFS, other?
>>
> I use software raid with mdadm.  Its pretty forgiving with powering down and
> removing a drive (after sync) and growing the array back down to the original
> size.  I mainly do this on my backup server running backuppc.  The files are
> compressed and hard linked between backups if they have not changed.  This makes
> any other type of offsite backup pretty hard ... rsync just ran out of memory.
> So adding a drive to the raid 1 and syncing is easy in comparison.  Having grub
> make the drive bootable  (since the os is also on a raid 1 partition) makes the
> drive very easy to just install in new hardware and get going again (assuming
> the original backup system was destroyed).

Yes, rsync's --link-dest=DIR option gets tedious very quickly when you 
have trees of directories.  (Driving rsync using scripts can solve this; 
perhaps this was a motivator for BackupPC?)


If your array file system is ext2, ext3, or ext4, how about unmounting 
the array, unmounting the destination partition, and using dump(8) and 
restore(8)?


David

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Thread

Sync two disks and hot swap Dominik George <nik@naturalnet.de> - 2017-11-08 12:00 +0100
  Re: Sync two disks and hot swap Michael Stone <mstone@debian.org> - 2017-11-08 18:10 +0100
    Re: Sync two disks and hot swap Dominik George <nik@naturalnet.de> - 2017-11-08 20:00 +0100
      Re: Sync two disks and hot swap Michael Stone <mstone@debian.org> - 2017-11-08 20:20 +0100
        Re: Sync two disks and hot swap Dominik George <nik@naturalnet.de> - 2017-11-09 10:20 +0100
          Re: Sync two disks and hot swap Michael Stone <mstone@debian.org> - 2017-11-09 13:40 +0100
            Re: Sync two disks and hot swap David Christensen <dpchrist@holgerdanske.com> - 2017-11-09 20:00 +0100
              Re: Sync two disks and hot swap Michael Stone <mstone@debian.org> - 2017-11-09 20:40 +0100
                Re: Sync two disks and hot swap Curt <curty@free.fr> - 2017-11-10 11:00 +0100
                Re: Sync two disks and hot swap Curt <curty@free.fr> - 2017-11-10 11:10 +0100
  Re: Sync two disks and hot swap David Christensen <dpchrist@holgerdanske.com> - 2017-11-09 00:10 +0100
    Re: Sync two disks and hot swap Bob Weber <bobrweber@gmail.com> - 2017-11-09 02:50 +0100
      Re: Sync two disks and hot swap David Christensen <dpchrist@holgerdanske.com> - 2017-11-09 08:10 +0100
        Re: Sync two disks and hot swap Bob Weber <bobrweber@gmail.com> - 2017-11-09 23:50 +0100
          Re: Sync two disks and hot swap David Christensen <dpchrist@holgerdanske.com> - 2017-11-10 00:10 +0100

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