Hi all. Recent builds (b129, b130 and b131) have had me noticing some zpool performance issues when scrubbing.
Running "bare" into some cheap SATA controllers, on a cheap mobo, running 6GB of DDR2 + an Intel Q6600, with 4 * 1TB Samsung consumer grade SATA drives, I've been accustomed to seeing around 150 to 180MB/sec scrubs on a single pool. Until b129, 130 and 131 hit. I've got dedup=on, compression=on (default, not gzip), no dedupe verify etc. I now see maybe 10MB/sec across 4 drives on scrub. Turning dedupe off seemingly didn't help. A mate has managed to replicate it on a totally different system, with different HDD's, different SATA card (LSI 3081 series), different mobo et al. Interestingly, scrubbing the singular rpool (root boot) in a single drive config seems to show normal performance (60+ MB/sec maintained). It's only when a multi-disk RAIDZ-1 is scrubbed does the performance problem show itself. Are we seeing an issue of dedupe here, or something less complex entirely? Thoughts/comments/issues/ideas to help troubleshoot? Thanks all. z -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
