RAID5 with MirrorDisk installed

[Sergey Klusov]

Can i make RAID5 with MirrorDisk?
my specs is:
HP 9000 L1000
4x 18.2 Seagate HDD's
HP-UX 11.00

Online JFS
HP MirrorDisk/UX

and if i can, then HOW? :)

[Andreas Voss]

Hi,

RAID5 in my knowlegde is not available with dedicated disks but you can use mirroring AND striping (similar to RAID5).
Look at this thread:
http://forums.itrc.hp.com/cm/QuestionAnswer/1,1150,0x5ea40559ff7cd4118fef0090279cd0f9,00.html
It will show you how to setup mirroring+striping.

Regards

[R.Suresh]

Hi,

Let me understand the Question first,

You want to have Raid 5 option,on the
required disks by the MirrorDISK-UX software.

No, Only Mirroring is Possible with this
Software,If you want to have Raid5,
Go for HPs AutoRaid Boxes.
This is a Hardware Raid configuration.

Thanks
R.Suresh.

[Stefan Farrelly]

Nope, you cant do RAID 5 with software only, you need an intelligent disk controller, eg. and Autoraid, Nike, EMC, XP256, HC/FC10 etc. But dont buy an autoraid - the performance is absolutely crap.

You can only do RAID0/1 with sofware.

[Sergey Klusov]

I already have installed entire system on one of those HDD, so if i'll do all that guy says, will it destroy contents of this drive?

[CHRIS_ANORUO]

You are not supposed to stripe a RAID5 disk subsystem.
http://www.hp.com/essd/model12H_writews.html

[CHRIS_ANORUO]

It is advisable to backup your system first before carrying out this task.

[Sergey Klusov]

I've added one hdd to vg00 (where one HDD already was)
then i've added other two HDDs to vg01

now how do i mirror content of vg00 onto vg01 ?

[John Palmer]

Hi Sergey,

You must have the disks in the same volume group in order to mirror them.

Take a look at this previous thread which gives details of how to mirror your root disk:-

http://forums.itrc.hp.com/cm/QuestionAnswer/1,1150,0xcf860559ff7cd4118fef0090279cd0f9,00.html

Regards,
John

[Sergey Klusov]

Explain me this:
What exactly bein mirrored? Logical Volume?
Volume group? Entire disk?

I'm newbee in UNIX, where can i learn more about that disk stuff?

[James R. Ferguson]

Sergey:

In general, a great source of information is http://docs.hp.com

For a good overview on setting up mirroring & striping, see the HP-UX System Administration Tasks manual.

...JRF...

[Andreas Voss]

Hi,

volume group: Collection of (entire) disks
divided into physical extends.
logical volume: Pieces (physical extends) from the volume group (can spawn over multiple disks)
mirroring: Copies from logical volumes (physical extend to other disks within the volume group)

Regards

[Sergey Klusov]

Thanks folks, i've made it :)