Hard drive performance question

[Jason Lieurance]

Hello,

Ok, I guess I thought 14 was high but it's ok then? I'm not sure what is acceptible
but I guess sometimes I thought it would go down instead of always being constant.
So I assumed(ignorantly) that there is a disk i/o problem.

-- 
Jason

Dan Nelson said:
> In the last episode (Aug 05), Jason Lieurance said:
>> I have FreeBSD 4.7 server running a qmail-imap-squirrelmail email server and a
>> apache 1.3.27 web server hosting 6 virtual domains that don't get a lot of
>> traffic.
>>
>> Hardware is:
>>
>> P3 933MHz CPU
>> 512 DDR ram
>> Fujitsu MAN3184MP 18.2 GB U160 10K rpm 8MB buffer 2.9 ms access Hard drive
>> Adaptec 29160LP U160 SCSI controller
>>
>> When I run vmstat, I get:
>>
>> procs      memory      page                    disks     faults      CPU
>>  r b w     avm    fre  flt  re  pi  po  fr  sr da0 md0   in   sy  cs us sy id 0
>> 14 0  184016  40900   26   0   0   0  31   0   0   0  245  839  28  1  1 98 0
>> 14 0   86940  40896    7   0   0   0  15   0  12   0  242  115  21  0  0 99 0
>> 14 0   81460  40896    6   0   0   0  12   0  10   0  239   98  18  0  0 100 0
>> 14 0   85172  40896    7   0   0   0  15   0  14   0  243  116  21  0  1 99 0
>> 14 0  190092  40896   32   0   0   0  37   0  10   0  250  220  35  0  0 100
>>
>> I've read this is a disk access problem where process are waiting on the disk.
>> As you can see this is a constant but I thought the disk system I have was
>> sufficient. Any thoughts, analysis, or other is appreciated, thanks.
>
> I see only 10-15 I/Os per second on your disk, which would overload a floppy drive
> but nothing else.  What problem specifically are you
> trying to fix?
>
> --
> 	Dan Nelson
> 	dnelson at allantgroup.com
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