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Zfs nexenta snapshots

Please clarify snapshots on zfs nexenta: best practises, use etc.
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janhoedt
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janhoedt
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
1. Ensure you have enough storage space in the ZFS pool.

2. Setup a Snapshot, as you would a Backup, one a day, twice a day.

3. Make sure you delete older snapshots after your retention period.

Make sure if you do use Snapshots for Backup and Restore you test them, you may want to tie in with VMware Snapshot at the same time the Nexenta Snapshot is created to maintain a consitent backup.

Overview of ZFS Snapshots

http://info.nexenta.com/rs/nexenta/images/white_paper_nexentastor_zfs_snapshots_and_replication.pdf
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janhoedtAuthor Commented:
Thanks! All I now would like to know: what can I safely enable by deafult?
During setup Nexenta there was a certain option, don't know it anymore but it mentioned that it speeds up functioning of Nexenta although I had to make sure an UPS was attached.

Therefore I'd like to have a quick backup solution (other backup solution are failing right now: VDP, VDR).
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
snapshots are very quick!

probably a write cache option if UPS was required.
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janhoedtAuthor Commented:
Thanks! But all I now would like to know: what can I safely enable by deafult and what happens if I restore a snapshot?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Just enable snapshots to be completed daily at a specific time.

when you have restore a snapshot, you have rolled back the zfs pool to the same state it was when the snapshot was taken, in a very similar fashion to VMware Snapshots. (e.g. Revert)
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janhoedtAuthor Commented:
Thanks, but that means you revert for ALL vm s and cannot restore one of the vm s.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That's correct.

But that depends on how you have configured your SAN.

If you had a VM per iSCSI LUN, that does not apply.

you can mount the existing saved snapshot, and restore a VM individually.
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