Am Wed, 22 Mar 2017 21:10:51 +0100 Michael Gmelin <free...@grem.de> schrieb:
> > On 22 Mar 2017, at 21:02, O. Hartmann <ohartm...@walstatt.org> wrote: > > > > CURRENT (FreeBSD 12.0-CURRENT #82 r315720: Wed Mar 22 18:49:28 CET 2017 > > amd64) is > > annoyingly slow! While scrubbing is working on my 12 GB ZFS volume, > > updating /usr/ports takes >25 min(!). That is an absolute record now. > > > > I do an almost daily update of world and ports tree and have periodic > > scrubbing ZFS > > volumes every 35 days, as it is defined in /etc/defaults. Prts tree hasn't > > grown much, > > the content of the ZFS volume hasn't changed much (~ 100 GB, its fill is > > about 4 TB > > now) and this is now for ~ 2 years constant. > > > > I've experienced before that while scrubbing the ZFS volume, some > > operations, even the > > update of /usr/ports which resides on that ZFS RAIDZ volume, takes a bit > > longer than > > usual - but never that long like now! > > > > Another box is quite unusable while it is scrubbing and it has been usable > > times > > before. The change is dramatic ... > > > > What do "zpool list", "gstat" and "zpool status" show? > > > zpool list: NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT TANK00 10.9T 5.45T 5.42T - 7% 50% 1.58x ONLINE - Deduplication is off right now, I had one ZFS filesystem with dedup enabled gstat: not shown here, but the drives comprise the volume (4x 3 TB) show 100% busy each, but one drive is always a bit off (by 10% lower) and this drive is walking through all four drives ada2, ada3, ada4 and ada5. Nothing unusual in that situation. But the throughput is incredible low, for example ada4: L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name 2 174 174 1307 11.4 0 0 0.0 99.4| ada4 kBps (kilo Bits per second I presume) are peaking at ~ 4800 - 5000. On another bos, this is ~ 20x higher! Most time, kBps r and w stay at ~ 500 -600. zpool status: pool: TANK00 state: ONLINE scan: scrub in progress since Wed Mar 22 19:12:41 2017 167G scanned out of 5.62T at 15.9M/s, 99h46m to go 0 repaired, 2.91% done config: NAME STATE READ WRITE CKSUM TANK00 ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 gpt/tank00 ONLINE 0 0 0 gpt/tank01 ONLINE 0 0 0 gpt/tank02 ONLINE 0 0 0 gpt/tank03 ONLINE 0 0 0 logs gpt/zil00 ONLINE 0 0 0 cache gpt/l2arc00 ONLINE 0 0 0 errors: No known data errors Here are the incredible low numbers more clear. Usually, the hardware is capable of doing ~ 280 - 300 MBytes/s. It is stuck for hours at 15 - 16 MBytes/s.
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