topic Re: SAS with mirror in Operating System - HP-UX

SAS with mirror

Amir Salim — Thu, 18 Mar 2010 13:38:32 GMT

Hi,
I currently have sas (software partition) setup on a server rx6600. Can I setup the 3rd spare disk (local storage) as a root disk mirror?
Thanks.

Re: SAS with mirror

Torsten. — Thu, 18 Mar 2010 13:42:05 GMT

I know SAS as Serial Attached SCSI - do you talk about something different here?

Re: SAS with mirror

Johnson Punniyalingam — Thu, 18 Mar 2010 13:50:55 GMT

>>>Can I setup the 3rd spare disk (local storage) as a root disk mirror?<<<

Are you referring to (software partition) setup
sliced ???

It would be better if you could post the commands, to shed more light on your Q ?

# lvlnboot â v

Re: SAS with mirror

Amir Salim — Thu, 18 Mar 2010 13:51:17 GMT

Hi Torsten,
from what I understood SAS automatically mirrors the boot disk. Amd it's setup on my 2nd local disk.
But I have a 3 disk free, can I setup a mirror on the free disk in conjunction with SAS running. Or will that cause any issues.
Thanks.

Re: SAS with mirror

Torsten. — Thu, 18 Mar 2010 13:53:24 GMT

OK, I assume you have the "standard" SAS controller.

This controller can mage 2 pairs of mirrored disks. So you cannot have a third copy from this controller.

May I ask you why you need it (perhaps different solutions for you)?

Re: SAS with mirror

Torsten. — Thu, 18 Mar 2010 13:53:37 GMT

OK, I assume you have the "standard" SAS controller.

This controller can manage 2 pairs of mirrored disks. So you cannot have a third copy from this controller.

May I ask you why you need it (perhaps different solutions for you)?

Re: SAS with mirror

Johnson Punniyalingam — Thu, 18 Mar 2010 13:56:50 GMT

>>But I have a 3 disk free, can I setup a mirror on the free disk in conjunction with SAS running. Or will that cause any issues<<

mirroring d'not cause any issues , as long you are sure if its "Free disk"

Follow below link to mirror "root disk"

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad_WP.pdf

Re: SAS with mirror

Johnson Punniyalingam — Thu, 18 Mar 2010 13:58:15 GMT

You consider " Software mirroring" using HPUX-Mirror

Re: SAS with mirror

Amir Salim — Thu, 18 Mar 2010 14:02:21 GMT

Hi Johnson, please elaborate on you suggestion.
P.S I'm a 1st timer how do I assign points and hopw many points are the standard?
Thanks.

Re: SAS with mirror

Pete Randall — Thu, 18 Mar 2010 14:05:51 GMT

To mirror on Itanium architecture follow this guide:
http://docs.hp.com/en/B2355-90950/ch06s02.html#cchgjafa

And, for 11.31, follow this:
http://docs.hp.com/en/B2355-90950/ch06s02.html#mrflv

As for assigning points, there are guidelines offered on the "assign points" page once you click on that link.

Pete

Re: SAS with mirror

Torsten. — Thu, 18 Mar 2010 14:06:18 GMT

You may consider to use LVM mirroring to (software) mirror your Integrated RAID (the SAS controller based) to a third disk.

This will work fine, but it makes it complicated to replaced this disk, once failed ...

If you want to have a "standby" copy of your boot disk (a clone), consider to use DRD (dynamic root disk).

Regarding points:

http://forums13.itrc.hp.com/service/forums/helptips.do?#33

Re: SAS with mirror

Amir Salim — Thu, 18 Mar 2010 14:15:33 GMT

Thanks Pete and Torsten and Johnson,

I will setup a drd and as Johnson mentioned, doesn't seem to be an issue with setting up a mirror as long as it's a free disk.
Thanks again guys, I will assign points accordingly.

Re: SAS with mirror

Johnson Punniyalingam — Thu, 18 Mar 2010 14:17:33 GMT

>>Hi Johnson, please elaborate on you suggestion.<<

You follow links posted by >>Pete

and

HP -officals documents steps given how to mirror disk in (IA)

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad_WP.pdf

Re: SAS with mirror

Amir Salim — Thu, 18 Mar 2010 14:23:11 GMT

Thanks for your help everyone.