On Sun, Jan 18, 2009 at 4:36 PM, Timothy Renner <timothy.ren...@gmail.com>wrote:
> A few questions on data replication: > Assuming I've created a pool named zfspool containing two unmirrored > disks and I create: > > zfs create zfspool/test2 > zfs set copies=2 zfspool/test2 > > Will data copied in there be guaranteed to be replicated on both > devices? Or does ZFS just try its best to spread the data among > different devices? > No, and not even that. It guarantee's you there will be two copies. It doesn't even make any intentional effort to spread it to multiple devices from what I understand. The second copy goes where it goes. > > > Also: Data replication begins on newly-written data AFTER the set > copies=? command. Is there a way to force a file system to "catch up" > to the new replication settings? (ie: copies=1 switching to copies=2 > for ALL data in the filesystem), or is the way to do it to create a new > file system with copies=2 and move data to it? Also conversely, > copies=2 switching to copies=1, in order to recover disk space... > Again, AFAIK, no way to do so recursively short of the copying.
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