How to setup RAID 0 or RAID 1 in HPUX 11.0

[Charlotte Wong]

We have two sets of machine:

1) rp2470 + DS2300 + UX11.0
2) rp5470 + DS2405 + UX11.0

Both machine are used for running Sybase server. Disk mirroring is possible in machine 2 because of resources allocation.

We would like to setup RAID 0 in machine 1 and RAID 1 in machine 2.

Any procedure to do so? Or we should ask our HP engineer to do so?

By the way, any recommendation to the approach?

Thanks!!

[Steven E. Protter]

Raid 1 is easy.


Use a real lvol and use a real disk
lvextend -m 1 /dev/vg01/lvol2 /dev/dsk/c1t1d0

Thats raid 1 excact copy mirroring.

It requires installation of a pay for product called mirror/ux.

This manual,page 20
http://docs.hp.com/hpux/pdf/B5532-90001.pdf

I don't think Raid 0 is possible though.

I don't think you need an engineer for this, a good search of itrc would have answered this question.

Extra reading:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=140137

SEP

[Charlotte Wong]

Thanks.. Do you mean that we just have to stripe disks into the same volume group and configure mirroring for RAID 1?

Do you mean we need other tools for configuring RAID 0 or it is totally impossible in UX11.0?

[Paul Eadington_1]

Raid 0 is possible as it is striping with no redundancy.
You can create a non mirrored logical volume using the -i and -I options, note though you will need more than 1 drive to make this feasible.

Raid 1 is disk mirroring and has been detailed above.

If you want to stripe and mirror you can, but that's a bit more involved and needs some scripting to extend your logical volume 1 extent at a time onto a seperate physical volume and then mirror that lot once complete. You'd need at least 4 disks in a volume group to make this feasible.

[Charlotte Wong]

Thanks so much!!

So RAID 0 is enabled by simply stripe serveral physical disks to the same volume group by Unix OS?

Do you have any idea if the disk array supports hardware RAID?

[Paul Eadington_1 · Accepted solution]

Your welcome :o)

Indeed, Raid 0 is as you mention.

Simplified example : Using Disk1, Disk2 and Disk3

pvcreate disk1 disk2 disk3
vgcreate {options} VGNAME disks
lvcreate -i 3 -I {size} -L {LV Size} VGNAME

As for your disk arrays, neither the DS2300 or DS2405 are capable of HW Raid I'm afriad.

As a note, my last comment in my last post was wrong regarding making a striped mirror.. I forgot all about the distributed option in creating a logical volume. So you can create a distributed logical volume which is mirrored.

Cheers

Paul

[Mark Grant]

Charlotte,

Many people might disagree with me here but the control and flexibility you have with software raid is worth the minor hit on performance in my view.

[Charlotte Wong]

Thanks so much to every of you!