Migrate raw devices from XP storage to EMC

[maurizio_6]

Hi,
I got some raw devices configurated in a vg on Xp storage, and i will migrate this devices in another vg on EMC storage. In the past, when i've migrated the file system, i've created a EMC vg similar to XP vg, and then i've copied whith cp command the data, in the end i've modified the fstab with the new vg name and mount the new file systems.
Now, how can i do?
I should create a new EMC vg, and then copy (throught the dd command) the raw devices, but the oracle's istance does not startup, because new link is on a different vg.
Can i solve this problem, with the vg export and then vg import?

Regards
Maurizio

[Stefan Farrelly]

yes, once youve copied to the new EMC vg vgexport the old XP vg and reimport the new EMC vg as the same vgname and lvol names as the old XP vg - this means your filesystems are the same as before so oracle will work.

or, get your oracle dba to do a simple piece of sql to rename the locations for the databases files from the old XP vg to the new EMC vg. This is what we do as its so simple.

[Jean-Luc Oudart]

Would HP MirrorUX be the solution ?

mirror to the new storage
sync
break the mirror

JL

[Jeff Schussele]

I'm with Jean-Luc.

Mirror the XP LVs to the EMC, then when you're convinced all is well & stable, break off the XP LVs.
Of course the LUN size would need to be the same.
Has the added benefit of not needing to change VG name(s).

Rgds,
Jeff

[tommy_28]

Hi,

I have a simular case here, and each VG has more than one PVs.

I plan to mirror all LVs with below steps:

0. Connect both Storage subsystems, define PVs with same size of old PVs.
1. Close all applications use storage subsystem
2. Add new PVs to VG that I would mirror
3. modify VG propertiy, seperate old and new PVs to two PVGs.
4. modify LV mirror policy to use PVG.
5. modify each LV's mirror number to 1
6. split off each LV
7. remove all current LVs
8. mv lv*copy to lv*, and mv rlv*copy to rlv*
9. mount necessary file systems

I've tested above steps in a trial environment, and gonna implement it on customer site.

Is there anything inappropriate?

Thanks&Regards.
Tommy

[Tim D Fulford]

Similar thread

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x655c31bd9c1b72419b87b2bef76caca5,00.html

Tim

[RolandH]

As I remeber, if you run Oracle with raw devices the lvol must belong to the oracle user, too

HTH
Roland