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zfs_vdev_max_pending
2009 Jul 07
0
[perf-discuss] help diagnosing system hang
...RU: 0x0
I had an idea that this might be due to NCQ overruns since if I''m not mistaken the X25E only supports 32 outstanding commands, so I''ve started testing various things. Setting sd_max_throttle in /etc/system doesn''t seem to make any difference.
However... tuning zfs_vdev_max_pendning down from 35 to 10 made a difference. Whereas if I used to see long "hickups" in "zpool iostat X25E 10", with that one tuned down to 10 things run *much* more smoothly - no hickups:
capacity operations bandwidth
pool used avail read write rea...