topic Re: Disk IO in Operating System - HP-UX

Disk IO

SM_8 — Tue, 11 Mar 2014 04:59:22 GMT

Hello All,
My knowledge on disk layouts is minimal. Can someone point me to the right direction where I can find more information on that.
I am working on a performance issue trying to resolve slow load times on a HP server.
Eg: c10t0d0 is one of the devices where there is a high avwait(average of 150) and avserv (avg of 27).
How can I find out what file system is mounted on the device c10t0d0?
How do I map the disk labels to the actual mount points ??

Can someone please help?

P.S. This thread has been moved from Disk to HP-UX > sysadmin. -HP Forum Moderator

Re: Disk IO

Shaikh Imran — Fri, 20 Aug 2004 23:51:27 GMT

Hi,

You can use this command
#strings /etc/lvmtab
This will give you the name of the
Volume group to which the disk is associated with & then use:
#bdf
This will give you the information as to which logical volume your file system is mounted & also to which Volume group this filesystem belongs.
So, now you have the information as to
which filesystem is the disk associated with.

As far as Disk I/O testing is considered
1)You use iostat command this will give you the exact throughput of the disk in Mbps
( see man iostat for details)
2)Also use sar -d 5 10 (e.g.)
command to see the disk i/o per 5 seconds
and 10 times.
( see man sar for details)

For all these information pls refer :

http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/5187-2216/5187-2216_top.html&con=/hpux/onlinedocs/5187-2216/00/00/53-con.html&toc=/hpux/onlinedocs/5187-2216/00/00/53-toc.html&searchterms=LVM&queryid=20040820-224652

Regards,

Re: Disk IO

SM_8 — Mon, 23 Aug 2004 12:59:35 GMT

Thanks for the response.
I have collected some stats using sar -d
Attached are the averages. Do you see something wrong??

Re: Disk IO

Sunil Sharma_1 — Tue, 24 Aug 2004 02:03:11 GMT

Hi,

If you are using LVM you can use
#pvdisplay -v /dev/dsk/c10t0d0

this will give you information about Volumes located on this disk and then you can find out the File system name by checking it with /etc/fstab file.

Sunil