On Sun, Aug 09, 2015 at 02:29:53PM +0200, Jim MacBaine wrote: > Hi, > > How does btrfs handle raid1 on a bunch of uneven sized disks? Can I > just keep adding arbitrarily sized disks to an existing raid1 and > expect the file system to continue to keep two copies of everything, > so I could survive the loss of any single disk without data loss? Does > btrfs work this way?
Yes, exactly. You may find that http://carfax.org.uk/btrfs-usage/ is helpful. Hugo. > For backing up several machines at home, I use an old Debian machine > which is equipped with some spare disks I could get my hands on. > Currently that would be 2 x 2TB, 1 x 1.5TB , 3 x 1TB disks. > > Traditionally I'm using rsync to create hardlinked backups on ext3/4 > on md-raid1. This setup has been working reliably for many years now, > including the survival of two disk failures. But it is quite > cumbersome to reshape the structure of the raids when I get a new > disk, an old one fails, or space requirements change. A single btrfs > with snapshots would be much easier to handle. I'm not aiming for > absolute reliability here -- all the really important stuff is backed > up in a third place as well. But I would rather not like my file > system to be the weakest link in the backup chain. > > Regards, > Jim -- Hugo Mills | Guards! Help! We're being rescued! hugo@... carfax.org.uk | http://carfax.org.uk/ | PGP: E2AB1DE4 | The Stainless Steel Rat Forever
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