EBS snapshot backups from a FreeBSD zfs file system: zpool freeze?

[Daniel Feenberg]

On Wed, 3 Jul 2013, Jeremy Chadwick wrote:

>  scripts.
>
>  Also, because nobody seems to warn others of this: if you go the
>  ZFS route on FreeBSD, please do not use features like dedup or
>  compression.  I can expand more on this if asked, as they have
>  separate (and in one case identical/similar) caveats.  (I'm always
>  willing to bend on compression as long as the user knows of the one
>  problem that still exists today and feels it's okay/acceptable)
>

Please expand on the problem with compression - we have a lot of very 
large, very "fluffy" datasets that compress down about 90% (and are 
accessed in pure sequential order) so compression is very attractive to 
us.

dan feenberg
NBER