Mirroring disks on an Itanium rx4640

[Joe Profaizer]

I only experience in disk mirroring on our L series PA-RISC servers. It seems that there may be a different procedure on the Itaniums. This is a new install on a rx4640 and vg00 currently has its only member as c2t1d0s2. The ioscan -funC disk displays:
disk 1 0/1/1/0.0.0 sdisk CLAIMED DEVICE HP 146 GMAT3147NC
/dev/dsk/c2t0d0 /dev/rdsk/c2t0d0
disk 2 0/1/1/0.1.0 sdisk CLAIMED DEVICE HP 146 GMAT3147NC
/dev/dsk/c2t1d0 /dev/dsk/c2t1d0s3 /dev/rdsk/c2t1d0s2
/dev/dsk/c2t1d0s1 /dev/rdsk/c2t1d0 /dev/rdsk/c2t1d0s3
/dev/dsk/c2t1d0s2 /dev/rdsk/c2t1d0s1


I did a pvcreate on /dev/rdsk/c2t0d0, it did not create all the other devices as I see for c2t1d0. I'm just not sure what the differences are here. Basically I want to have both disks in vg00 and I also want to mirror. I do have mirrordisk-ux.

Please consult.

Thanks,

..Joe

[Patrick Wallek · Accepted solution]

The procedure is indeed different for Itanium machines.

The appropriate procedure is outlined in these docs:

Submitted Date: 3/31/04
Title: How to mirror vg00 using LVM on IA with 11.23
Document ID: KBRC00014526
Last Modified Date: 8/3/05
http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000079976697

Submitted Date: 7/1/05
Title: hp server rx4610 - Creating a Root Mirror in HP-UX
Document ID: tis07412
Last Modified Date: 7/19/05
http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000079537324

[Andrew Rutter]

hi joe

there is some considerable changes to mirroring itanium systems
I have been putting together a small doc with the required procedure myself in preperation for a new server arriving.
There seems to be many ideas of the best ways, but this looks ok to me
I've attached it for you to look at hopefully give you a rough idea of whats needed.
I will be doing it today from this doc so hopefully i got it right!



Andy

[Joe Profaizer]

Andrew,
I'm following your document. I have a question though on the following line:
Confirm efi partition is present and populated
#efi_ls â d /dev/rdsk/cxtxdxs1
#efi_ls â d /dev/rdsk/cxtxdxs1 â u /EFI/HPUX/AUTO /tmp/AUTO; cat /tmp/AUTO

Should the second command be efi_cp instead of efi_ls. There is no -u qualifier for efi_ls.

[Patrick Wallek]

To verify the contents of the EFI you can use:

9. Verify the contents of the auto file on the primary and the mirror.
NOTE: Using "s1"
# efi_cp -d /dev/rdsk/c2t1d0s1 -u /EFI/HPUX/AUTO /tmp/AUTO.pri
# efi_cp -d /dev/rdsk/c3t2d0s1 -u /EFI/HPUX/AUTO /tmp/AUTO.alt
# cat /tmp/AUTO.pri
# cat /tmp/AUTO.alt

That is step 9 from the first document link in my previous post.

[Joe Profaizer]

So, the alternate disk is the only disk that needs to override quorum, correct?

[Andrew Rutter]

hi joe,

yes i came across my mistake aswell.

just copy the file back when amended and cat it to check the output, or reboot to the efi and you can check it there.

personally i always overide quorum on both boot disks, this only needs to be done if you only have 2 disks.

Andy

[Jayasuntar]

Hi,

Please see the attached file. This will give u full details.

Regards