Quoting Pierre-Alain RIVIERE <[EMAIL PROTECTED]>:
Hi, I'm a pretty new user of Openfiler and I'm wondering myself what is the best way to achieve iSCSI backup. Indeed, I'm using iSCSI volume to export Xen block devices over network. Each of my Xen DomU have its own iSCSI volume. On my Openfiler box I have a LTO-3 tape drive and I want to make backup and recovery as simple as possible. I'm thinking about this procedure : - make a LVM snapshot of my iSCSI volume - dd the snapshot to a backup file (may be is it possible to pipe it directly to the tape drive?) - send the backup to the tape drive - delete the LVM snapshot And in case of disaster I should have only to restore LVM metadata and write backup to LVM volume using dd. What do you think about this usage? Am I wrong somewhere? May be I missed something?
It's not going to be possible to pipe a snap directly to tape because a snapshot doesn't involve any "data", only information about where the data is.
You should be able to dd the volume, you may be able to pipe it to tape from dd, but I wouldn't recommend that because dd isn't smart enough in this regard.
What I do is actually mount the volume and back it up using Backup Exec. In your case, you can use tar to write it to tape.
Also, its just my recommendation, but I'd suggest not exporting a new volume for each domU. I plan ahead and export all the data I need and create volumes on the dom0. I think this reduces the load on both your iscsi server and it's initiators.
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