topic Present 2 Vdisk as one logical volume on one host in HPE EVA Storage

Present 2 Vdisk as one logical volume on one host

Indra Satriani — Mon, 11 Oct 2010 16:55:27 GMT

Hi,

This may be simple question among you expert here. I have an EVA4400 and I wanna know if it's possible to present 2 vdisk as one logical volume on one host (a Windows 2003 host), or should I just use spanned volume on the host?

Thanks and regards.

Re: Present 2 Vdisk as one logical volume on one host

Rob Leadbeater — Mon, 11 Oct 2010 17:11:55 GMT

Hi,

No I don't think you can combine two vdisks at the EVA level.

You'd have to use a spanned volume on the host.

Regards,
Rob

Re: Present 2 Vdisk as one logical volume on one host

HenkW — Tue, 12 Oct 2010 04:50:01 GMT

Indra,

What is the reason you want to persent 2 vdisks in one logical volume instead of presenting one big Vdisk.

Regards

Re: Present 2 Vdisk as one logical volume on one host

Indra Satriani — Tue, 12 Oct 2010 05:31:46 GMT

Actually I want to create 4TB vdisk but from what I read, my EVA only allows me to create a maximum 2TB per vdisk, so I'm looking another way to present 4TB to the host.

And apparently I'm gonna use striped volume instead of spanned volume since each vdisk are already on vraid5. Any suggestions?

Re: Present 2 Vdisk as one logical volume on one host

Uwe Zessin — Tue, 12 Oct 2010 05:45:41 GMT

You can create a 4TB virtual disk on an EVA-4400 if:
- the controller firmware is quite new
- the disk group was created from this firmware AND
-- in enhanced mode

As far as I know, you cannot grow that virtual disk any further even with the most recent firmware, so it might not be a bad idea to use OS-level volume management. Then you can assign both 2TB virtual disks to both controllers and maybe enjoy better throughput.