On Thu, Aug 24, 2006 at 07:07:45AM -0700, Joe Little wrote: > We finally flipped the switch on one of our ZFS-based servers, with > approximately 1TB of 2.8TB (3 stripes of 950MB or so, each of which is > a RAID5 volume on the adaptec card). We have snapshots every 4 hours > for the first few days. If you add up the snapshot references it > appears somewhat high versus daily use (mostly mail boxes, spam, etc > changing), but say an aggregate of no more than 400+MB a day. > > However, zfs list shows our daily pool as a whole, and per day we are > growing by .01TB, or more specifically 80GB a day. That's a far cry > different than the 400MB we can account for. Is it possible that > metadata/ditto blocks, or the like is trully growing that rapidly. By > our calculations, we will triple our disk space (sitting still) in 6 > months and use up the remaining 1.7TB. Of course, this is only with > 2-3 days of churn, but its an alarming rate where before on the NetApp > we didn't see anything close to this rate.
How are you calculating this 400MB/day figure? Keep in mind that space "used" by each snapshot is the amount of space unique to that snapshot. Adding up the space "used" by all your snapshots is *not* the amount of space that they are all taking up cumulatively. For leaf filesystems (those with no descendents), you can calculate the space used by all snapshots as (fs's "used" - fs's "referenced"). How many filesystems do you have? Can you send me the output of 'zfs list' and 'zfs get -r all <pool>'? How much space did you expect to be using, and what data is that based on? Are you sure you aren't writing 80GB/day to your pool? --matt _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
