On Sun, Feb 15, 2009 at 5:00 PM, Bob Friesenhahn < bfrie...@simple.dallas.tx.us> wrote:
> On Sun, 15 Feb 2009, Robert Milkowski wrote: > >> >> Well, in most cases resilver in ZFS should be quicker than resilver in >> a disk array because ZFS will resilver only blocks which are actually >> in use while most disk arrays will blindly resilver full disk drives. >> So assuming you still have plenty unused disk space in a pool then zfs >> resilver should take less time. >> > > It is reasonable to assume that storage will eventually become close to > full. Then the user becomes entrapped by their design. Adding to the > issues is that as the ZFS pool ages and becomes full, it becomes slower as > well due to increased fragmentation, and this fragmentation slows down > resilver performance. > Pardon me for jumping into this discussion. I invariably lurk and keep mouth firmly shut. In this case however, curiosity and a degree of alarm bade me to jump in....could you elaborate on 'fragmentation' since the only context I know this is Windows. Now surely, ZFS doesn't suffer from the same sickness? As a followup; is there any ongoing sensible way to defend against the dreaded fragmentation? A [shudder] "defrag" routine of some kind perhaps? Forgive the "silly questions" from the sidelines.....ignorance knows no bounds apparently :) Warm Regards, -Colin
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