From: Gary Brett (gary.brett@fidessa.com)
Date: Thu Aug 09 2007 - 09:54:08 EDT
Hi Gurus
I have a disk that's having performance issues so I ran iostat and as you can
see below it shows extended periods where %w column (percentage of time there
are transactions waiting for the service) is at 100% yet very little is being
written to or read from the disks and %b column is often 0%. Is it possible to
see why these io operations are getting queued up? Has anybody seen this
before?
Cheers
Gary
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 106.9 0.0 919.5 0.0 0.2 0.0 1.8 0 19 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 125.1 0.0 1256.6 0.0 0.3 0.1 2.4 1 28 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 151.0 0.0 1507.8 0.0 0.3 0.1 2.2 1 28 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 109.0 0.0 976.1 0.0 0.4 0.0 3.2 0 34 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 24.0 0.0 200.0 0.7 0.1 28.0 2.5 67 6 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 3.0 0.0 16.0 1.0 0.1 326.4 16.8 98 2 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 5.0 0.0 52.0 1.0 0.0 198.0 4.5 99 1 c1t2d0
/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 100 0 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 100 0 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 100 0 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 100 0 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 100 0 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 100 0 c1t2d0
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
4.0 24.0 32.0 57.5 0.0 0.2 0.5 6.3 1 7 c1t0d0
0.0 95.0 0.0 3171.2 0.2 0.3 2.4 2.7 22 24 c1t2d0
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