diskinfo show different size vs the actual device

[hi_5]

I configured a 345G lun on EMC storage,
do ioscan and diskinfo only give 212G ?
What happen???

[Michael Tully]

Creating a LUN of that size gives you no flexibility at all.

What type of EMC storage have you got ? Symmextrix/Clariion ?

You would better served creating smaller LUN's so that you can present them to more systems, and then have the flexibility to add them as required to more than one volume group. Even if you were using them on a windows based system you could create what is called a 'meta' where you group a number of LUN's into one single LUN.

Regards
Michael
"When I have trouble spelling, it's called fat finger syndrome"

[hi_5]

Symmetric, I understand what you said, but that is not the current issue . No matter what size I created on EMC, diskinfo should give me the same size reflecting the EMC disk...hopefully a reboot will fix this problem... any other thoughts???

[Michael Tully]

There are specific methods on LUN creation and this depends upon the size of the physical disks in your symm.
For example if your using 181Gb disks, you must split them into a minimum of 12 logical LUN's, 73Gb for memory is 5.

Please advise the actual method your using to create these LUN's?

So it seems you could be creating 'meta' LUN's.

Regards
Michael
"When I have trouble spelling, it's called fat finger syndrome"

[hi_5]

Mike,
We created a "Meta volume " with a size of 345G. After rebooted the host, diskinfo shows the proper size. I don't know whether or not this is a OS issue or EMC issue.

[hi_5]

reboot the problem since to fix this...

[Sridhar Bhaskarla]

Hi,

Diskinfo actually does not physically query the drive if the information about the drive is already cached. If you previously created 212GB drive and you destroyed and created a new one with the same LUN number, then yours was the case.

There are patches to fix this problem. In the patches site search for the keyword "diskinfo" and see if it finds any patches that are not there on the system.

-Sri