topic Re: snapshot creation in Operating System - HP-UX

snapshot creation

Arturo_5 — Tue, 15 Jun 2004 13:40:54 GMT

Hello folks,

Can i create a snapshot of a raw device? and How to?
I have sybase database 12 with raw device definition.

Thanks

Re: snapshot creation

Steven E. Protter — Tue, 15 Jun 2004 13:47:44 GMT

snapshot of a raw device? Do you have a digital camera?

Apologies if the joke is bad.

Though not sure of your term, there is n snapshot type function for raw disk areas.

As the name implies the storage is raw and its up to the admin or application to handle backups and configuration.

There fore sybase utilities are used to back up the data on the raw device.

Ignite/UX will back up raw devcies, but not necessarily the data stored on them. If you restore a system from ignite, you will get a raw disk area with proper permissions, of this I am sure.

SEP

Re: snapshot creation

Uday_S_Ankolekar — Tue, 15 Jun 2004 14:01:00 GMT

If you mean snpshot of a file system then yes you can do it..

use snapoff option while mounting the file system

mount -F vxfs -o snapoff=dev/vgnn/lvolnn(for which you want to take snap) /dev/vgnn/lvolnn ( This one where you keep snap)

-USA..

Re: snapshot creation

Thierry Poels_1 — Tue, 15 Jun 2004 14:03:36 GMT

hi,

if you can cleanly stop the Sybase DB, you can dd the raw devices to other LVOLs (of same size), and dd them back if things go wrong.

No such thing as snapshot for raw devices, only for VXFS filesystems.

good luck,
Thierry.

Re: snapshot creation

A. Clay Stephenson — Tue, 15 Jun 2004 15:18:56 GMT

It depends. If you are running LVM then it's not possible although you can do an lvsplit but VxVM does have snapshot ability.

vxassist snapshot volname snapvolname

Re: snapshot creation

David Child_1 — Wed, 16 Jun 2004 08:23:22 GMT

Depending on what type of storage this is on and what software you have on that array (if any), you may be able to make copies from the storage side.

HPs VA series has this capability, EMC has TimeFinder, HP XPs/Hitachi's also have some business continuance capabilities.

David

Re: snapshot creation

Arturo_5 — Wed, 16 Jun 2004 10:59:38 GMT

Thanks all,

Now a have a clear idea over the use of snapshot... IÂ´m going to work in enable this feautere in our EVAÂ´s..

Ger