iostat and Hitachi Luns

[jaggerd]

Hey all

I have a new Tagmastore Hitachi, I'm running the iostat to see which LUNS are getting hit the hardest during an application upgrade and conversion. Does anyone know of an iostat flag or another command with the same or similar output as iostat which would give LUN information rather than averaging out the hdisk stats?

Thanks in advance

 

[DukeSSD]

Check the iostat man page or command reference:

http://publib.boulder.ibm.com/infoc...pic=/com.ibm.aix.cmds/doc/aixcmds3/iostat.htm

-d and -D.

 

[sbix]

I have Hitachi on a SAN too.
IMHO there are no command capable to convert hdisk name to LUN.
As you know, the LUN is only visible via lscfg -vl hdisk command (probably in some Z1 field?)

 

[coolaix]

I had worked with Hitachi SAN, some time back, you can use iostat <n> where n is the number of seconds , but getting details from this output is lil difficult ,
if you have large number of disks AND you have multipaths , so you see a disk many times in iostat . Getting the info from that output is difficult.

Hitachi provides you some commands to monitor disk i/o , unfortunately I donk know them. You have to check your manuals.

some handy commands are
dlnkmgr view -path
dlnkmgr view -drv

If you are worried about the performance
==========================================

1)Check the qdepth setting of the LUNs before you add them to your VG.I generally set it to 256.
2)Also check the pbuf setting with
"dlmodmset -o" and make it 65536 with "dlmodmset -b 65536". I guess you have to reboot after this.

 

[jaggerd]

Awesome, thanks guys.

I think that the senior is just getting tired of having to spreadsheet everything, so he has started writing something to collect everything and average it out.