VxVM boot disks

[John Guster]

hp-ux 11.11 with mirrored 2 boot disks A and B under VxVM. Planning upgrade OS to 11.23 say with cold install. 2 scenarios:
split the mirror before cold install:
1. If install new OS on A disk failed, will system boot from old os from disk B?
2. how can we mount all file systems on disk B if cold install is good?
mirror is kept and new OS is on disk A:
1. system should boot up from disk B should cold install OS failed, correct?
2. If new install is successful, once VxVM enabled, will disk B auto sync to disk A and lose all old OS on disk B as flag on disk B is set to auto import?
Basically I am looking for a solid back out path and mountable old os file systems.

Thank you for sharing your expertise.

[SANTOSH S. MHASKAR]

Hi,

Now all server boot disks are hot-plugable. So
why don't u pull out disk B (having OS 11.11)
and start cold install of OS 11.23 on disk A,
this will also hide disk B from the total disk
capacity while cold install filesystem
configuration and prevents accidential
overwriting of data in disk B.

If cold install is successful, boot from disk
A, plugin disk B and mirror it online.

If installation fails then plugin disk B and boot from disk B, then mirror disk A online.


-Santosh

[John Guster]

This is one point. However, in such an installation, lots system configuration files need be copied over from old to new os, /etc/passwd, for an example...I would like leave the disk B in so I can mount it...

Thank you.

[SANTOSH S. MHASKAR]

Hi,

U can unplug Disk B while cold install of 11.23 and once successful, plugin disk B,create new vg for disk B mount the filesystem to new location eg.

/ filesystem in disk B u can mount on /old_root
/stand filesystem in disk B u can mount on /old_stand
/usr filesystem in disk B u can mount on /old_usr

and u then copy the required file.

-Santosh

[John Guster]

thanks.