Hi, All,
We have an oracle standby running on zfs and the database recovers very very
slow. The problem is the IO performance is very bad. I find the recordsize
of the ZFS is 128K, and the oracle block size is 8K. My
My question is:
When oracle tries to write a 8k block, will zfs read in 128K and then write
128K. If that's the case, then zfs will do 16 (128k/8k=16 )times IO as
necessary.
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.2 0.0 1.6 0.0 0.0 6.0 7.7 0 0 md4
0.0 0.2 0.0 1.6 0.0 0.0 0.0 7.4 0 0 md14
0.0 0.2 0.0 1.6 0.0 0.0 0.0 7.6 0 0 md24
0.0 0.4 0.0 1.7 0.0 0.0 0.0 6.7 0 0 sd0
0.0 0.4 0.0 1.7 0.0 0.0 0.0 6.5 0 0 sd2
0.0 1.4 0.0 105.2 0.0 4.9 0.0 3503.3 0 100 ssd97
0.0 3.0 0.0 384.0 0.0 10.0 0.0 3332.9 0 100 ssd99
0.0 2.6 0.0 332.8 0.0 10.0 0.0 3845.7 0 100 ssd101
0.0 4.4 0.0 563.3 0.0 10.0 0.0 2272.4 0 100 ssd103
0.0 3.4 0.0 435.2 0.0 10.0 0.0 2940.8 0 100 ssd105
0.0 3.6 0.0 460.8 0.0 10.0 0.0 2777.4 0 100 ssd107
0.0 0.2 0.0 25.6 0.0 0.0 0.0 72.8 0 1 ssd112
UC4-zuc4arch$> zfs list -o recordsize
RECSIZE
128K
128K
128K
128K
128K
128K
128K
128K
128K
Thanks,
Daniel,
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