There are better ways to snapshotting [LWN.net]

There are better ways to snapshotting

Posted May 11, 2009 5:22 UTC (Mon) by butlerm (subscriber, #13312)
In reply to: There are better ways to snapshotting by anton
Parent article: The two sides of reflink()

Netapp does writable snapshots of writable snapshots. The advantage of the
ZFS scheme is you can have an unlimited number of snapshots, where with
Netapp these days I believe you get 256.

The ZFS scheme is based on logical sequence numbers, Netapp uses block maps.
I understand that BTRFS allows nested writable snapshots, but that comes at a
general performance cost that ZFS doesn't have.

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