From: C. Tate Baumrucker (tate@baumrucker.org)
Date: Thu Jul 13 2006 - 16:42:21 EDT
Problem: poor write performance with configuration included below.
Before attaching striped subdevices to mirror, they write/read very fast
(>20,000 kw/s according to iostat), but after mirror attachment and sync
performance is <2,000 kw/s. I've got standard SVM-mirrored root disks
that perform at > 20,000 kw/s, so something seems odd.
My I/O tests are done using large file transfer and bonnie++ while
watching iostat output.
Any help would be greatly appreciated.
Thanks,
Tate
Config follows:
Running 5.9 Generic_117171-17 on sun4u sparc SUNW,Sun-Fire-V890.
Configuration is 4 72GB 10K disks with the following layout:
d0: Mirror
Submirror 0: d3
State: Okay
Submirror 1: d2
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 286607040 blocks (136 GB)
d3: Submirror of d0
State: Okay
Size: 286607040 blocks (136 GB)
Stripe 0: (interlace: 4096 blocks)
Device Start Block Dbase State Reloc Hot Spare
c1t4d0s0 0 No Okay Yes
c1t5d0s0 10176 No Okay Yes
d2: Submirror of d0
State: Okay
Size: 286607040 blocks (136 GB)
Stripe 0: (interlace: 4096 blocks)
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s0 0 No Okay Yes
c1t2d0s0 10176 No Okay Yes
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