Yep, compression is generally a nice win for backups. The amount of
compression will depend on the nature of the data. If it's all mpegs,
you won't see any advantage because they're already compressed. But
for just about everything else, 2-3x is typical.
As for hot spares, they are indeed global.
Jeff
On Tue, Dec 11, 2007 at 03:16:44PM -0800, Dave Lowenstein wrote:
Okay, my order for an x4500 went through so sometime soon I'll be using
it as a big honkin area for DSUs and DSSUs for netbackup.
Does anybody have any experience with using zfs compression for this
purpose? The thought of doubling 48tb to 96 tb is enticing. Are there
any other zfs tweaks that might aid in performance for what will pretty
much be a lot of long and large reads and writes?
I'm planning on one big chunk of space for a permanently on disk DSU,
and another for the DSSU staging areas.
Also, I haven't looked into this but is a spare considered part of a
zpool, or is there such a thing as a global spare?
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