question about io problem

[M.Kursad DARA]

There is six disks in array.

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.28    0.00    3.45    8.87    0.00   87.40

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz
avgqu-sz   await  svctm  %util
sda               0.27     1.09 54.98  3.91   495.61   132.89    10.67
0.61   10.35   4.78  28.17

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           3.40    0.00   20.20   71.30    0.00    5.10

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz
avgqu-sz   await  svctm  %util
sda               1.60     2.40 390.20 13.80 32180.80   189.00    80.12
16.79   40.52   2.48 100.02

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           3.00    0.00   16.50   62.90    0.00   17.60

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz
avgqu-sz   await  svctm  %util
sda               0.80     0.20 342.00 29.00 26078.40   372.80    71.30
15.27   42.47   2.70 100.06

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           3.59    0.00   20.06   67.47    0.00    8.88

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz
avgqu-sz   await  svctm  %util
sda               1.00     0.00 444.51 13.97 31861.08   146.91    69.81
14.83   32.27   2.18  99.86

-----Original Message-----
From: owner-nginx at sysoev.ru [mailto:owner-nginx at sysoev.ru] On Behalf Of
Dave Cheney
Sent: Tuesday, May 27, 2008 2:07 PM
To: nginx at sysoev.ru
Subject: Re: question about io problem


Can you post a few samples of iostat 5

How many disks are in your array ?

On 27/05/2008, at 8:52 PM, M.Kursad DARA wrote:

> Concurrent established ~2000 users.
>
> It's SCSI
>
> 2 GB memory.  50 Mb is free now.
> It's not running on VPS
>
>
>
>
> -----Original Message-----
> From: owner-nginx at sysoev.ru [mailto:owner-nginx at sysoev.ru] On Behalf
> Of
> Dave Cheney
> Sent: Tuesday, May 27, 2008 12:49 PM
> To: nginx at sysoev.ru
> Subject: Re: question about io problem
>
>
> How many spindles do you have ? What kind of drives? SATA, PATA, SCSI,
> FC, etc?
>
> How much memory do you have, how much is free at the moment ?
>
> Are you running inside a VPS ?
>
> Dave
>
> On 27/05/2008, at 7:17 PM, M.Kursad DARA wrote:
>
>> Centos 5.
>>
>> I'm using iostat -x 1
>> Always see %90
>>
>> -----Original Message-----
>> From: owner-nginx at sysoev.ru [mailto:owner-nginx at sysoev.ru] On Behalf
>> Of
>> Igor Sysoev
>> Sent: Tuesday, May 27, 2008 11:32 AM
>> To: nginx at sysoev.ru
>> Subject: Re: question about io problem
>>
>>
>> On Tue, May 27, 2008 at 09:20:12AM +0300, M.Kursad DARA wrote:
>>
>>> How can i optimize io on nginx ?
>>>
>>> it's serving image and flv files. IO is very high ( %90 )
>>>
>>> is there any option to handle it ?
>>
>> What OS do you use ? Where do you see 90% IO ?
>>
>>
>> -- 
>> Igor Sysoev
>> http://sysoev.ru/en/
>>
>>
>>
>
>
>
>