Mirror Disk 11 to 11i upgrade

[Robert A Kirkpatrick]

Hi,
I am upgrading a number of D and L class systems from 11 to 11i. I have read through the upgrade guide from HP and I am confused as I am told that I have to un-mirror my disks to upgrade. In what guide and in another it does not mention this???

[LucianoCarvalho]

Hi,

I you will do a col install you don't have to do that.

regards

[Stefan Farrelly]

There is nothing in the 11i Installation and upgrade guide (on www.dos.hp.com) about mirroring. Nothing in the requirements section or perparation section, or problems section, so I dont think you need to unmirror.

Who told you that you have to unmirror your disks to upgrade ?

[Pete Randall]

Robert,

This is pure conjecture on my part, but it would seem to me that the guide that recommends breaking the mirror is attempting to provide a fall-back path in case there are problems with the upgrade. I can't imagine another reason.


Pete

[Ravi_8]

Hi,

no need to unmirror the disk to upgrade.

i prefer cold install rather than upgrade for better performance

[Robert A Kirkpatrick]

Hi,
In the March 2002 11i install & upgrade guide p58. It says that update-ux removes Mirror Disk ux bundles??? There is no reference in the same guide dated Sep 2002??

[Robert A Kirkpatrick]

Ravi, can you justify that??

[Dave Wherry]

Just a personal opinion. First, I would unmirror so I had a fall back point.
Second, the upgrade may go a bit faster if the I/O's only have to happen on the primary disk instead of writing to the primary and the mirror. It may not be significant but, there will be half the writes happening.

[Steven E. Protter]

To do the upgrade, you do not have to unmirror. My evidence, that's how I did it in upgrade class.

Though I'll warn you, the failure rate in an HP lab for that upgrade was around 35% in my class.

This was an environment where HP completely controlled the setup with Ignite.

Cold install has a 100% success rate witht he hardware you mention. What we are doing right now here is as follows:

We built an Ignite Server with HP-UX 11.11(11i) we installed all of our applications.

We then boot the other servers off this Ignite server and do a network based Ignite installation.

Here are some docs on Ingite.

http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90767/B2355-90767_top.html&con=/hpux/onlinedocs/B2355-90767/00/00/11-con.html&toc=/hpux/onlinedocs/B2355-90767/00/00/11-toc.html&searchterms=network%7cinstall%7c11i%7cIgnite&queryid=20030515-085354


http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/5187-1827/5187-1827_top.html&con=/hpux/onlinedocs/5187-1827/00/00/25-con.html&toc=/hpux/onlinedocs/5187-1827/00/00/25-toc.html&searchterms=network%7cinstall%7c11i%7cIgnite&queryid=20030515-085354

The methodology I'm recommending works, I even have 11.00 images on the Ignite server for disaster recovery on the boxes we're decommissioning this year.

SEP

[Paul Platts]

My experience is that, where MirrorDisk is installed, as part of the upgrade to 11i a new version of LVM is installed - without MirrorDisk. The disks will still be mirrored (I think) but you will not be able to change or maintain mirroring. You will need to get a new codeword to get MirrorDisk off of the 11i CD's & then re-install MirrorDisk asap.

[Todd McDaniel_1]

Since you boxes are older, Im not sure I would recommmend upgrading on them, Although I prefer upgrading 11.0 to 11i on newer systems.

Regarding the mirroring... when I did an 11i upgrade, not cold installs, it does NOT disable mirrored filesystems.

After I did my upgrade all my previous mirrored filesystems were still mirrored. however, I had to reinstall MirrorDisk/UX before I could make NEW mirrored VGs/LVOLs.

I did this with 5 N-4000s and had no problems whatsoever, other than having to vxenablefs -a so my advanced mount options would work.

Also, I would sugggest doing the vxupgrade to move your JFS filesystems to version 4.