sar %wi/o is very high_urgent

[Md. Farhan A Azam]

Hi,

%wi/o of one of our server is very high and its hampering our buisness. So plz give me any suggestin to resolve the issue. plz get the sar output below.

HP-UX host1 B.11.11 U 9000/800 11/20/08

09:54:17 %usr %sys %wio %idle
09:54:22 30 8 61 0
09:54:27 36 9 55 0
09:54:32 34 8 58 0
09:54:37 37 9 54 0
09:54:42 36 8 57 0

Average 35 8 57 0

[SKR_1]

This can be a database(oracle) issue. May be lots of oracle processes are running. You can contact oracle admin too for this issue.

OR you can check the disk utilization with glance, if any of the disk is having some problems.

Thanks

SKR

[Steven E. Protter]

Shalom,

Well figure out from top or your system knowledge what applications are waiting for i/o

* Reconfigure disk array to use raid 1 on disks that are used for heavy database rights.

* Plan your data layout to spread the heavy i/o to different disks.

* Perhaps plan a purchase of a data holder like a disk array that can handle higher i/o

SEP

[Md. Farhan A Azam]

Hi,
Database admin has done, what ever they can as per DBA...previously it was Ok. again we observed that %wi/o is very high.

[Md. Farhan A Azam]

Is there anything which we can do fron OS side.

[Suraj K Sankari]

Hi,

Can u post sar -d 2 10
did u checked how many disk are there some time if one disk is having problem then also its effect the hole.

Suraj

[Md. Farhan A Azam]

Hi,

This server attached with storage...plz find the sar -d output attachde.

[SKR_1]

sar -d output is looking ok.
Check for the top processes and total how many number of processes are running/sleep/zombie at the moment with top/glance. Check for cpu and memory utilization too.

Thanks

SKR

[Wim Rombauts · Accepted solution]

sar -d output looking OK ???
Or I am mistaken and don't know what the values for AcServ mean, or this system has a serious IO problem.

A good storage system had an average AvServ below 20, referably even below 10. Peaks over 100 are plain deadly (to my humble opinion). In a quick scan of the sar output, I have seen AvServ values of almost 500,what means you have an average of 2 I/O's per second.

So, I think you need to have a serious look at your storage.