topic Re: DISK I/O in Operating System - HP-UX

DISK I/O

Trng — Sat, 07 Mar 2009 07:20:37 GMT

Hi,

os hpux 11.23 ia 64

One of my disk is showing high I/O...is there any way to check whcih process is highly using the disk ??no glance on my machine ..is there any script to check which process is causing my disk I/O high ??

rgds

Re: DISK I/O

Taifur — Sat, 07 Mar 2009 07:55:35 GMT

Hi Trng,

You can check it by sar tools or you can install glance from application cd for checking activity report.
From root console
#sar

For details man pages of sar and check by the below link
#man sar

http://docs.hp.com/en/B2355-
90692/sar.1M.html

If it helps, pls assign point.

Rgds//
Taifur

Re: DISK I/O

Hakki Aydin Ucar — Sat, 07 Mar 2009 21:14:32 GMT

you can use
vmstat -d

iostat also can show disk I/O statistics

but glance seems most sutiable for your request

Re: DISK I/O

Hakki Aydin Ucar — Sat, 07 Mar 2009 21:26:19 GMT

HP OpenView Performance Agent also is good comes a part of Glance:

http://docs.hp.com/en/5991-7469/ar01s06.html

Re: DISK I/O

skt_skt — Sun, 08 Mar 2009 00:09:25 GMT

where r u seeing HIGH IO for a particular disk? Which tool r u using?

Re: DISK I/O

Asif Sharif — Sun, 08 Mar 2009 05:06:34 GMT

Hi,

Disk Bottlenecks

High disk utilization (sar -d, io stat, Glance);

Example:-

#sar -d 5 10

Large disk queue length (sar -d, io stat, Glance);
High %wio (sar -u);
Low buffer cache hit rates (sar -b);
Large run queue with idle CPU (vmstat 5 30).

Regards,
Asif Sharif

Re: DISK I/O

Avinash20 — Sun, 08 Mar 2009 05:48:46 GMT

"is there any way to check whcih process is highly using the disk"

It would be difficult to find the process which utilized the disk without having specific tools, eg: glance

You would be able to find the disk which is doing high IO via "sar -d"
You need to look into the VG which this disk belongs to
To find the VG(strings /etc/lvmtab)

Once you find the VG, check what lv's are configured, and which Filesystem it is mounted.

If its application FS, then u cud check from the application end.

But to find the exact process, you need some tools.

Am not sure, but sometime back, trial software for glance was available free for download,

Re: DISK I/O

Avinash20 — Sun, 08 Mar 2009 05:55:17 GMT

You could download Glance trail version from

https://h10078.www1.hp.com/cda/hpms/display/main/hpms_content.jsp?zn=bto&cp=1-11-15-28^9637_4000_100__&jumpid=reg_R1002_USEN

"HP GlancePlus/UX for HP-UX 11i Software Evaluation"

Re: DISK I/O

Trng — Mon, 23 Mar 2009 10:43:25 GMT

Hi,

thanks for the replies,still i havent recd the correct answer which i am looking for .i dont want to use glance,as my customer dont to to install it ...i heared some scripts are there to findout the process which is higly utilising the disk i/o...does anyone knows ?..

rgds
trng