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Presenting Snapshot to Linux

Benoît
Regular Advisor

Presenting Snapshot to Linux

Hi,

Is it possible to present a snapshot to more than one Linux AS 4 at a time (read-only mode)?
From EVA side, no problem.
But from Linux servers, I don't know ...

Thanks
6 REPLIES
Steven Clementi
Honored Contributor

Re: Presenting Snapshot to Linux

The os should not care. Since it is read only, there should be no corruption possible.

The only thing is you may have to manually present it or make it part of a script to do multiple presentations.

Never done it so I am not absoultely sure, but don't see why it would not work.


Steven
Steven Clementi
HP Master ASE, Storage and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5)
RHCE
NPP3 (Nutanix Platform Professional)
Benoît
Regular Advisor

Re: Presenting Snapshot to Linux

I heard that Linux needs to write something about the superblock on each filesystem so that's why I wondered.

Do you think it's better to present it as read-only from CV EVA side or to just mount it as ro?
Steven Clementi
Honored Contributor

Re: Presenting Snapshot to Linux

Not sure. This is where my limited Linux experience comes in handy.

;o)


Steven
Steven Clementi
HP Master ASE, Storage and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5)
RHCE
NPP3 (Nutanix Platform Professional)
Nigel Poulton
Respected Contributor

Re: Presenting Snapshot to Linux

Hi Benoît,

I know that by default Linux does write certain metadata to the superblock when certain events happen. For example whether or not a filesystem was unmounted properly or not. This is then read by Linux to determine whter or not to perform a fsck on the filesystem. It also records how many times a LUN has been mounted for similar reasons.

There could well be other metadata that has to be written to the superblock and there may even be ways to override this but I would suggest you post this kind of question on a Linux forum as it seems to bea more of Linux than storage question because you are right that thisis no problem from the EVA.

mackem
Talk about the XP and EVA @ http://blog.nigelpoulton.com
Benoît
Regular Advisor

Re: Presenting Snapshot to Linux

Thanks.

Is it possible for an administrator to transfer this thread to Linux forum?
Steven Clementi
Honored Contributor

Re: Presenting Snapshot to Linux

If you post a message here...

" http://forums1.itrc.hp.com/service/forums/familyhome.do?familyId=295 "

...someone should be able to move it.

Include the link to this thread.

See if they can remove this replay as well, but not really necessary.


Steven
Steven Clementi
HP Master ASE, Storage and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5)
RHCE
NPP3 (Nutanix Platform Professional)