jess
2011-Jun-15 19:16 UTC
[zfs-discuss] Oracle F20 SSD devices for ZIL and L2ARC - decreased performance
Using the filebench workload "fileserver" with default settings for
120 seconds I consistently get better IO performance without F20 (pcie) SSD zil
devices and/or SSD L2ARC devices.
Without F20s I get the following results (often better):
IO Summary: 542430 ops, 4520.0 ops/s, (411/822 r/w) 109.4mb/s, 4963us
cpu/op, 39.8ms latency
With the F20s as Zil and L2ARC devices (see zpool status output below):
IO Summary: 424930 ops, 3540.9 ops/s, (322/644 r/w) 85.3mb/s, 7584us
cpu/op, 49.9ms latency
The SSDs when mounted on their own appear to perform well with very little
latency. Further iostat doesn''t appear to show any issues on the F20
devices while in the zpool and filebench running.
Single SSD as a lone zpool:
IO Summary: 698585 ops, 5821.2 ops/s, (529/1058 r/w) 140.8mb/s, 2827us
cpu/op, 31.1ms latency
zpool with all devices including F20s (c7 and c8):
NAME STATE READ WRITE CKSUM
store ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c0t5000C50039C0C1DBd0 ONLINE 0 0 0
c0t5000C50039D7A4D7d0 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
c0t5000C50039D7A147d0 ONLINE 0 0 0
c0t5000C50039D7FE5Bd0 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
c0t5000C50039D9A7C7d0 ONLINE 0 0 0
c0t5000C50039D78F33d0 ONLINE 0 0 0
mirror-3 ONLINE 0 0 0
c0t5000C50039D81DCFd0 ONLINE 0 0 0
c0t5000C50039D82AF3d0 ONLINE 0 0 0
mirror-4 ONLINE 0 0 0
c0t5000C50039D82BBBd0 ONLINE 0 0 0
c0t5000C50039D8314Fd0 ONLINE 0 0 0
logs
mirror-5 ONLINE 0 0 0
c7t0d0 ONLINE 0 0 0
c8t0d0 ONLINE 0 0 0
cache
c7t1d0 ONLINE 0 0 0
c8t1d0 ONLINE 0 0 0
spares
c0t5000C50039D82887d0 AVAIL
Oracle T3-1 w 16 drive trays
Oracle Solaris 10 9/10 s10s_u9wos_14a SPARC
SunOS data01-boc 5.10 Generic_144488-12 sun4v sparc sun4v
ZFS pool v22 FS v4
FileBench 21.4.8
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