Hi there,
Customer has some questions regarding ZFS compression.
- What is the compression algorithm used?
- How much space saving, ballpark?
(I said it depends on the data but customer still wants to know if we
have stats.)
- Is there a ZFS feature that will output the real uncompressed size of
the data? The scenario is if they had to move a compressed ZFS
filesystem back to UFS, say. 'ls' will give the file's real
uncompressed size, but customer had rather not write a script to sum
everything up.
- Is there a Best-Practice for when and when not to turn on compression?
I read somewhere, I forget where, that compression should be used
primarily to save space, but is there a good balance to be struck
between giving up a few CPU cycles to gain more disk space?
- Compressed files have a -T bit set, I looked this up, docs say this
has no meaning, but does it have special meaning to ZFS?
- Customer wants to do a diff between snapshots. Is there an RFE
already filed?
_ Customer would like benchmarking numbers. I think there is a blog
item but do we have something more "official"?
Thanks very much.
CT
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
