Disappointing speed with ZFS

Ivan Voras ivoras at freebsd.org
Tue Feb 12 11:31:04 UTC 2008


Alexey Tarasov wrote:
>       tty             ad4              ad5              ad6             cpu
>  tin tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
>    0  347  7.36   1  0.01  57.35  43  2.42  42.84  44  1.84   1  0  1  0 98
>    0  606  0.00   0  0.00  58.62  31  1.76  63.02 246 15.14   0  0  3  0 97
>    2 5334  0.00   0  0.00  57.14   7  0.37  64.00 355 22.20   0  0  2  0 97
>    2 3194  0.00   0  0.00   0.00   0  0.00  63.35 295 18.26   0  0  2  1 97
>    0  148  0.00   0  0.00   0.00   0  0.00  63.90 336 20.97   0  0  0  1 99
>    0  453  0.00   0  0.00  55.87  87  4.72  64.00 290 18.14   1  0  3  0 96

Sorry, can't help you. I was expecting to see a lot of small
transactions, indicating seeking across the file system, but the numbers
seem normal enough.

Is the drive & ZFS topology "normal" - you don't perhaps have a zpool
made of multiple partitions/slices on the same drive? Can you send the
output of "zpool status"?

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