I track a lot of parameters on my Server and the only thing I can't realy put in perspective is the IOstat. It is a MySQL Server, is this a good result, or should I worry?
root:/var/lib/mysql# iostat -xc
Linux 2.6.28-11-server () 07/25/2009 _x86_64_ (8 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
3.66 0.19 0.45 1.04 0.00 94.69
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 2.55 871.36 1.46 27.67 392.40 7200.45 260.64 1.02 34.85 2.48 7.22
sda1 0.18 0.61 0.03 0.01 3.60 4.98 215.91 0.01 185.95 19.25 0.08
sda2 0.01 0.00 0.00 0.00 1.03 0.02 919.32 0.00 21.36 6.94 0.00
sda3 2.36 870.75 1.43 27.66 387.76 7195.46 260.68 1.01 34.65 2.48 7.21
sdb 2.37 871.36 1.63 27.67 392.69 7200.45 259.12 0.65 22.07 2.51 7.35
sdb1 0.17 0.61 0.04 0.01 3.59 4.98 187.33 0.01 110.67 12.54 0.06
sdb2 0.00 0.00 0.00 0.00 1.03 0.02 256.48 0.00 2.36 1.50 0.00
sdb3 2.19 870.75 1.60 27.66 388.06 7195.46 259.23 0.64 21.93 2.51 7.34
md0 0.00 0.00 0.38 0.62 3.06 4.96 8.00 0.00 0.00 0.00 0.00
md1 0.00 0.00 0.00 0.00 0.00 0.02 8.36 0.00 0.00 0.00 0.00
md2 0.00 0.00 2.01 898.28 62.49 7186.28 8.05 0.00 0.00 0.00 0.00
Also what war options for decreasing read / write activity?
- delay_______key_______writes
- memory based Tables
- less indicies
The write load is quite high on the tables.