var sidebar_align = 'right';
var content_container_margin = parseInt('350px');
var sidebar_width = parseInt('330px');
What is considered to be high disk I/O?
Here's what I have in cPanel
Device Trans./Sec Blocks Read/sec Blocks Written/Sec Total Blocks Read Total Blocks Written
sdb 17.34 28.97 205.08 1258108 8906492
sdb1 0.01 0.03 0.00 1214 4
sdb2 16.84 15.99 120.88 694646 5249768
sdb3 6.32 8.89 48.33 386190 2099064
sdb5 1.59 2.83 12.05 122762 523288
sdb6 0.01 0.02 0.00 980 0
sdb7 2.13 1.14 15.77 49550 684992
sdb8 1.02 0.06 8.04 2726 349376
And I think it's going really slow because of disk writes... but do these numbers support that theory?
I just ran "sudo hdparm -t /dev/sdb7"... that's the drive that has my /home directory.. and this is what I got
84 MB in 3.02 seconds = 27.86 MB/sec
Is that really slow?
I ran it again and got
160 MB in 3.05 seconds = 52.47 MB/sec
what does /usr/bin/sar say for iowait?
What command do I use to get that?
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Higher the disk read speed, better it is. But when the load is high, or if there are more I/O bound applications hdparm could give low speed..
Try it when there arent much applications waiting on I/O, to check for any possible hardware issue.
Or check which are the processes in the 'D' state. Such processes are mostly on IO wait..
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