[PVE-User] WG: Severe error w. posibility of data loss

Holger Ernst he at ernstdatenmedien.de
Tue Nov 29 12:01:50 CET 2011


Yes, I know, because Proxmox deletes everything...;-)

No, seriously: I understand that not two nodes should try to access the same lvm partition at the same time but adding/deleting partitions and accessing different partitions should be safe because the nodes do see the actual lvm metadata (structure)!? 
At least that was what I found wile fiddling around with ISCSI. And dont the cluser nodes do exactly that?
The only thing I can imagine would be a race condition between two nodes adding/deleting exactly the same moment.

Best regards, Holger

-----Urspr√ľngliche Nachricht-----
Von: Dietmar Maurer [mailto:dietmar at proxmox.com] 
Gesendet: Montag, 28. November 2011 19:01
An: Holger Ernst; pve-user at pve.proxmox.com
Betreff: RE: [PVE-User] WG: Severe error w. posibility of data loss

> I am sorry that obviously I am unable to state my point clearly but I'll try again:
> I dont think it is neccessary to implement a full lock here because as you already
> said, the ISCSI device should not be used like this.

You can't use LVM without a locking mechanism - this would be very dangerous!

- Dietmar










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