From: Jarkko Airaksinen (JAiraksinen@zed.com)
Date: Mon Mar 19 2007 - 11:20:29 EST
Hello all Gurus out there,
I'm running Sol8 on a Fujitsu-Siemens PW450. I'm seeing some heavy
(70-85%) iowait and I don't know what the CPUs are waiting for.
CPU ID %usr %avg %sys %avg %wio %avg %idle %avg
MadpE avg
0 0 6.93 28.96 6.93 9.02 74.26 51.70 11.88 10.33
46 88
1 1 8.91 27.78 1.98 7.66 85.15 53.96 3.96 10.60
30 84
2 2 13.86 25.95 1.98 6.53 72.28 56.71 11.88 10.81
29 75
3 3 12.87 26.92 3.96 6.94 72.28 56.55 10.89 9.59
35 75
Average 10.64 27.40 3.71 7.54 75.99 54.73 9.65 10.33
35 80
It's not the disks at least. The busiest disks are:
Disk %busy %avg avque await aserv nrd avg nwr avg rd(k)
wr(k)
Avg. 1.77 1.50 0.1 0.0 0.5 1205 1046 559 62 25603
31961
c5t50001 66.56 13.07 3.2 0.0 4.2 765 118 0 0 14943
0
c3t50001 33.40 9.70 1.5 0.0 3.6 420 91 0 0 10342
0
c3t50001 13.10 1.48 0.2 0.0 2.8 7 1 77 6 103
4562
c5t50001 10.65 2.33 0.2 0.0 1.6 2 2 96 9 63
5513
c3t50001 9.66 1.64 0.1 0.0 1.7 4 1 83 7 55
4887
c5t50001 8.75 1.53 0.2 0.0 2.7 1 1 59 5 8
3516
c3t50001 8.24 1.93 0.1 0.0 1.7 2 2 79 8 32
4531
c3t50001 7.72 1.21 0.1 0.0 2.3 2 1 59 5 16
3390
Nor is it the network adapter:
Net ipkts avg opkts avg colli avg ierr oerr frm crc
uflo oflo
hme0 6.9 9.5 7.9 8.4 0.0 0.0 0 0 0 0
0 0
What else could it be? What tools would you recommend for finding the
source of the iowait?
Br,
Jarkko
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