Just a note, I've noticed this problem too. I run a RAID1 check once
every 24 hours, and while developing the script to do it, noticed that
the machine became virtually unusable - mouse was jumpy, typing lagged.
I run this check every morning at 4.00am so I'm usually asleep and
don't notice it, so it hasn't been a big bother to me.
The data may be a bit corse, however here is what sysstat/sar says my
machine does during the check. Let me know if you want any more or other
sar data.
sar
~~~
00:01:01 CPU %user %nice %system %iowait %steal %idle
.
.
03:51:01 all 0.68 0.00 0.33 0.00 0.00 98.99
03:56:01 all 1.03 0.00 0.39 0.00 0.00 98.58
04:01:01 all 0.73 0.01 20.70 0.01 0.00 78.55
04:06:01 all 1.32 0.00 82.81 0.07 0.00 15.80
04:11:01 all 1.26 0.00 67.91 0.20 0.00 30.63
04:16:01 all 1.18 0.00 58.14 0.22 0.00 40.46
04:21:01 all 1.00 0.00 79.94 0.16 0.00 18.89
04:26:01 all 1.09 0.00 94.54 0.28 0.00 4.09
04:31:01 all 1.33 0.00 84.23 0.13 0.00 14.30
04:36:01 all 1.58 0.00 71.76 0.19 0.00 26.47
04:41:01 all 0.68 0.00 0.35 0.00 0.00 98.97
04:46:01 all 0.82 0.00 0.42 0.00 0.00 98.76
.
.
sar -b (Report I/O and transfer rate statistics)
~~~~~~
00:01:01 tps rtps wtps bread/s bwrtn/s
.
.
03:51:01 0.45 0.00 0.45 0.00 4.19
03:56:01 0.98 0.00 0.98 0.00 10.53
04:01:01 294.21 293.21 1.00 37529.57 10.01
04:06:01 1198.39 1197.36 1.03 153262.11 9.22
04:11:01 995.09 994.64 0.45 127314.06 4.11
04:16:01 852.48 852.03 0.45 109060.47 4.19
04:21:01 1161.13 1160.17 0.96 148500.42 9.15
04:26:01 1361.27 1360.51 0.76 174144.93 7.33
04:31:01 1226.02 1225.36 0.66 156846.40 6.13
04:36:01 1052.60 1051.96 0.65 134650.39 6.03
04:41:01 0.73 0.00 0.73 0.00 6.61
04:46:01 0.45 0.00 0.45 0.00 4.19
.
.
.
sar -B (Report paging statistics)
~~~~~~
00:01:01 pgpgin/s pgpgout/s fault/s majflt/s
.
.
03:51:01 0.00 1.16 5.05 0.00
03:56:01 0.00 2.47 15.38 0.00
04:01:01 0.01 2.54 21.32 0.00
04:06:01 0.00 2.57 6.94 0.00
04:11:01 0.00 1.15 5.04 0.00
04:16:01 0.00 1.16 5.04 0.00
04:21:01 0.01 2.36 6.24 0.00
04:26:01 0.00 1.88 4.88 0.00
04:31:01 0.00 1.63 8.35 0.00
04:36:01 0.00 1.63 5.04 0.00
04:41:01 0.00 1.81 11.12 0.00
04:46:01 0.00 1.16 5.04 0.00
04:51:01 0.00 1.07 5.05 0.00
04:56:01 0.00 1.16 5.05 0.00
.
.
sar -q (Report queue length and load averages)
~~~~~~
00:01:01 runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15
.
.
03:51:01 0 106 0.00 0.00 0.00
03:56:01 0 106 0.00 0.00 0.00
04:01:01 3 117 7.14 2.19 0.76
04:06:01 0 113 7.97 6.23 2.95
04:11:01 0 113 7.95 7.29 4.31
04:16:01 0 113 7.56 7.48 5.20
04:21:01 1 110 6.38 7.35 5.81
04:26:01 1 107 2.07 4.33 4.96
04:31:01 0 107 2.16 2.94 4.17
04:36:01 0 106 1.57 2.19 3.50
04:41:01 0 106 0.01 0.79 2.52
04:46:01 0 106 0.00 0.28 1.81
04:51:01 0 106 0.00 0.09 1.30
04:56:01 0 106 0.00 0.03 0.93
.
.
Regards,
Mark.
--
"Sheep are slow and tasty, and therefore must remain constantly
alert."
- Bruce Schneier, "Beyond Fear"
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