On Thu, May 01, 2008 at 10:21:19AM -0700, Bryan wrote: > What's the status of online capacity expansion for RAID-Z? > Hardware raid cards still have a leg up in this regard because it negates > the zfs's supposed scalability feature that SMBs are most interested in. > For example if you start off with 2 raidz2 vdevs of 5 1TB drives each. Then > as required they can be grown by adding additional drives to the same > raidz2 vdevs minimizing costs. Creating new raidz2 vdevs would carry an > additional 100% cost increase just to increase the pool size by 2TB.
While Sun has no official plans to implement RAID-Z expansion, Matt Ahrens and I have written up a plan for how one might implement it: http://blogs.sun.com/ahl/entry/expand_o_matic_raid_z If there are members of the community interested in implementing pieces of this, we could set up a project on opensolaris.org. Adam -- Adam Leventhal, Fishworks http://blogs.sun.com/ahl
