Jeremy Chadwick wrote:
Compared to UFS2 snapshots (e.g. dump -L or mksnap_ffs), ZFS snapshots
are fantastic. The two main positives for me were:
1) ZFS snapshots take significantly less time to create; I'm talking
seconds or minutes vs. 30-45 minutes. I also remember receiving mail
from someone (on -hackers? I can't remember -- let me know and I can
dig through my mail archives for the specific mail/details) stating
something along the lines of "over time, yes, UFS2 snapshots take
longer and longer, it's a known design problem".
2) ZFS snapshots, when created, do not cause the system to more or less
deadlock until the snapshot is generated; you can continue to use the
system during the time the snapshot is being generated. While with
UFS2, dump -L and mksnap_ffs will surely disappoint you.
"a known design problem" in the sense of "intentional", yes. They were
written to support bg fsck, not as a lightweight filesystem feature for
general use.
Kris
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