=D0=92 =D1=81=D0=BE=D0=BE=D0=B1=D1=89=D0=B5=D0=BD=D0=B8=D0=B8 =D0=BE=D1=82 =
5 =D0=B0=D0=B2=D0=B3=D1=83=D1=81=D1=82=D0=B0 2010 14:19:59 =D0=B2=D1=8B =D0=
=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB=D0=B8:
>=20
> Can you please remove use of the zpool entirely (e.g. zpool destroy
> tank) and do a write test to each disk itself? E.g.:
>=20
> dd if=3D/dev/zero of=3D/dev/ad8 bs=3D64k count=3D1000000
> dd if=3D/dev/zero of=3D/dev/ad10 bs=3D64k count=3D1000000
> dd if=3D/dev/zero of=3D/dev/ad12 bs=3D64k count=3D1000000
>=20
> I don't recommend using large block sizes (e.g. bs=3D1M, bs=3D3M).
dd if=3D/dev/zero of=3D/dev/ad8 bs=3D64k count=3D1000000
1000000+0 records in
1000000+0 records out
65536000000 bytes transferred in 604.849406 secs (108350937 bytes/sec)
dd if=3D/dev/zero of=3D/dev/ad10 bs=3D64k count=3D1000000
1000000+0 records in =20
1000000+0 records out
65536000000 bytes transferred in 757.755459 secs (86487005 bytes/sec)
dd if=3D/dev/zero of=3D/dev/ad12 bs=3D64k count=3D1000000
1000000+0 records in
1000000+0 records out
65536000000 bytes transferred in 604.857282 secs (108349526 bytes/sec)
=20
> If all of the above dds show good/decent throughput, then there's
> something strange going on with ZFS. If this is the case, I would
> recommend filing a PR and posting to freebsd-fs about the problem,
> pointing folks to this thread.
>=20
> If all of the dds show bad throughput, then could you please do the
> following:
>=20
> - Provide vmstat -i output
> - Install ports/sysutils/smartmontools and run smartctl -a /dev/ad8,
> smartctl -a /dev/ad10, and smartctl -a /dev/ad12
>=20
> If only one of the dds shows bad throughput, then please:
>=20
> - Install ports/sysutils/smartmontools and run smartctl -a /dev/XXX,
> where XXX is the disk which has bad throughput
> - Try making a ZFS pool with all 3 disks, but then do "zpool offline
> tank XXX" and then re-attempt the following dd:
> dd if=3D/dev/zero of=3D/tank/test.zero bs=3D64k count=3D1000000
> And see what throughput looks like.
>=20
> Thanks.
=2D----
Alex V. Petrov
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