topic Create Lun less than 1GB in HPE EVA Storage

Create Lun less than 1GB

Gerald Taylor — Mon, 19 May 2008 10:49:43 GMT

Hello Guru's

I would like to create a LUN that is less than 1GB in size. It appearst he Command View 8.0 GUI will not allow this. Has anyone run into this situation? Thanks in advance

Hardware: EVA4400 and Command View 8.0

Gerald

Re: Create Lun less than 1GB

SJO EGGER — Mon, 19 May 2008 11:00:12 GMT

hello

it doesnÂ´t work. the minimum is 1GB.

regards

Re: Create Lun less than 1GB

OFC_EDM — Mon, 19 May 2008 11:05:25 GMT

You can't do it.

What's your reason for wanting a smaller lun?

You can present the 1GB carve it up into smaller chunks at the OS level if needed.

Re: Create Lun less than 1GB

Gerald Taylor — Mon, 19 May 2008 11:10:39 GMT

DBA requested a series of very small LUNS for an Oracle RAC implementation. This will be "raw" storage for oracle.

However, Perhaps there is a way to divide this space up that I don't know about. Redhat 4 is the OS the LUNS are presented too.

Re: Create Lun less than 1GB

Uwe Zessin — Mon, 19 May 2008 11:35:55 GMT

Maybe you could create new, smaller devices with the help of LVM (Logical Volume Manager).

Command View EVA and its parent, the HSV Element Manager, have never allowed virtual disks smaller than 1 GigaByte.

Re: Create Lun less than 1GB

OFC_EDM — Mon, 19 May 2008 12:01:20 GMT

We had to do this before for the DBA's.

We had to create 8 small disk areas for them for various logs.

Had to create the 1GB LUN and then use LVM (on HPUX) to carve it up.

What's the IO per sec requirement? Do you have enough disks in your group to meet it? I don't have the formula to calculate IO per second...I got support to do that.

In the meantime we just created the LUN in the group with the largest amount of disks to get as many spindles as possible.

Eventually moving the LUN to our XP12000 where more spindles were available.

Redhat has LVM so you should be good to go.

Re: Create Lun less than 1GB

Petr Spisek — Tue, 20 May 2008 13:25:47 GMT

Hi,
you can create small partition (slice) by some volume manager. What operatin system do you have?
P.

Re: Create Lun less than 1GB

Duncan Edmonstone — Tue, 20 May 2008 14:44:57 GMT

In the scheme of things 1GB is pretty small these days.

In RAC you do use some small disks for the OCR and voting disks - with mirrors etc you might have 4 of these - so thats maybe 4GB of storage in total. Yes its a watse, but not much of one... don't sweat it...

HTH

Duncan

Re: Create Lun less than 1GB

Rob Leadbeater — Tue, 20 May 2008 17:04:49 GMT

> Yes its a waste, but not much of one...

Agreed. On TruCluster systems, I've had a 1GB Vdisk just for a 2048 byte partition on a cluster disk. It's a little annoying, but in the grand scheme of things, 1GB isn't that much space.

Cheers,

Rob