So I have had this question on my mind and finally remembered while I was
checking my email to throw this by the PLUG.
Doing a quick iostat:
[r...@mythfe1 ~]# iostat -x 5
Linux 2.6.18-92.1.6.el5.centos.plus (mythfe1.xxxxxx.com) 01/22/2009
avg-cpu: %user %nice %system %iowait %steal %idle
6.88 0.00 1.17 0.48 0.00 91.47
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
avgqu-sz await svctm %util
sda 0.22 7.32 0.49 2.71 12.70 80.29 29.01
0.02 5.38 1.00 0.32
sdb 6.41 4.25 0.97 0.78 59.06 40.80 57.10
0.01 6.04 2.30 0.40
sdc 6.41 4.24 0.94 0.78 58.83 40.77 58.07
0.01 5.24 2.16 0.37
sdd 6.44 4.25 0.94 0.77 59.04 40.79 58.47
0.01 6.39 2.48 0.42
sde 6.44 4.25 0.91 0.77 58.85 40.77 59.16
0.01 6.22 2.41 0.41
sdf 2.35 2.20 0.29 0.14 21.14 18.97 92.20
0.00 10.44 4.25 0.18
sdg 2.35 2.20 0.29 0.14 21.10 18.96 93.42
0.00 9.46 4.16 0.18
sdh 2.36 2.22 0.28 0.12 21.09 18.96 100.85
0.01 12.85 4.90 0.19
sdi 2.36 2.22 0.28 0.12 21.13 18.97 99.68
0.01 12.97 4.84 0.19
sdj 2.35 2.18 0.29 0.16 21.11 18.97 89.45
0.00 7.86 3.78 0.17
sdk 2.35 2.18 0.29 0.16 21.13 18.97 89.45
0.00 8.36 3.89 0.17
sdl 6.49 4.67 0.86 0.35 58.84 40.76 82.43
0.01 7.93 3.73 0.45
sdm 6.50 4.67 0.88 0.35 59.06 40.79 81.23
0.01 9.16 4.10 0.50
hda 0.69 0.00 0.02 0.00 5.75 0.00 242.79
0.00 15.47 10.48 0.02
md0 0.00 0.00 5.34 24.47 343.89 195.79 18.10
0.00 0.00 0.00 0.00
md1 0.00 0.00 1.86 11.49 122.81 91.94 16.08
0.00 0.00 0.00 0.00
sdn 0.02 5.01 0.10 0.18 7.09 41.54 172.16
0.11 374.60 3.60 0.10
You can see my 14 drives, sda-sdn... My question is this:
What happens when you hit /dev/sdz? Does it use /dev/sdaa or what?
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