topic Re: Data migration and Mirroring in Operating System - HP-UX

Data migration and Mirroring

Darren Gibbs — Fri, 14 Mar 2003 14:23:53 GMT

We are migrating data from an XP256 to an XP1024. I'd like to use Mirror/DiskUX to do the migration, but I need to re-create the VG's to handle the larger LUN on the XP1024. Is my best option to perform a tape backup/restore on my SAN attached library?

BTW - I have to keep the same VG names as our Sybase database is using raw devices and requires the same path name to the device.

Re: Data migration and Mirroring

Pete Randall — Fri, 14 Mar 2003 14:28:47 GMT

Firstly, you need to remember that Mirror/DiskUX functions at the logical volume level within a VG, so you would have set up the XP1024 within the same VG as the XP256.

I would lean towards tape, myself.

Pete

Re: Data migration and Mirroring

Rita C Workman — Fri, 14 Mar 2003 14:36:06 GMT

I recently migrated data from an Old EMC array to a new one and had the same issue has you with having to recreate the vg's.

Jim & John gave me some great pointers that have proved invaluable in migrating data from array to array. And although I still have more to go...to date...it has worked seamlessly with NO errors.

Take a look at this thread that recommends the fbackup/frecover option. And the tips about cleaning up you hardware path.

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x520f31ec5e34d711abdc0090277a778c,00.html

Rgrds,
Rita

Re: Data migration and Mirroring

John Palmer — Fri, 14 Mar 2003 14:41:34 GMT

If you can temporarily connect both XP's then you could:

1. Create your new VG with a different name.
2. Create your new LV's
3. Use dd to copy old to new LV's.
4. Export both VG's then import the new one with the old one's name.

This avoids tape and you can consider the old VG as a backup until everything has been tested on the new XP.

Regards,
John

Re: Data migration and Mirroring

Darren Gibbs — Fri, 14 Mar 2003 14:55:08 GMT

Rita - I read your post but the difference here is that I must re-use the VG name.

John - I didn't you could import an exported VG with an alternate name. What must you do to accomplish this?