Compressed partition or block device?

[Jamon Camisso]

On 12-07-09 04:51 PM, Lennart Sorensen wrote:
> On Mon, Jul 09, 2012 at 04:11:16PM -0400, Jamon Camisso wrote:
>> There is a ZFS port that runs in kernel space, which is actively
>> maintained by Brian Behlendorf (of Apache, Mozilla fame). If someone was
>> going to port ZFS to Linux, he's one of the few I'd expect to be able to
>> do it correctly.
>>
>> It works well since it is a port of ZFS proper. Consider this /sites/git
>> directory that I use on an EXT4 filesystem, it is 479MB:
>>
>> git at zeus:pts/10:/git % du -sh /sites/git
>> 479M    /sites/pwp
>>
>> Now look at the same files (copied over with rsync) on a ZFS volume:
>>
>> git at zeus:pts/10:/BACKUPS/git % zfs get compressratio BACKUPS/git
>> NAME         PROPERTY       VALUE  SOURCE
>> BACKUPS/git  compressratio  1.24x  -
>>
>> git at zeus:pts/10:/BACKUPS/git % du -sh /BACKUPS/git
>> 352M    /BACKUPS/git
>>
>> That's a 127mb savings.
>>
>> You can even use disk image files as your zpool devices, so you don't
>> need to use an entire disk or partition if you just want to try things out.
>>
>> http://zfsonlinux.org/
> 
> But again that is filesystem compression, not block device compression
> (which is what was requested).
> 
> Also the ZFS lincese isn't compatible with the GPL, and hence while you
> can play with ZFS on your own system, you can't distribute it.
> 

It is block level compression & deduplication. It can be distributed
however you please as long as it is not a part of the Linux kernel,
since that would be considered a derived work.

Jamon
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