[OpenIndiana-discuss] ZFS improvements.

Maurilio Longo maurilio.longo at libero.it
Tue Nov 23 17:55:29 UTC 2010

Jesus Cea wrote:
> The problem is evident. If you minimal allocation size is 512 bytes, per
> file you waste 256bytes.
> If your minimal allocation size is 4096 bytes, per file you waste 2048
> bytes.
> Mean values, of course.


more than that

maurilio at krumiro:~$ ls -lR /iscsi/snv_143 | wc -l

maurilio at rsync:~$ ls -lR /nas/test/snv_143/ | wc -l

At 2Kb, mean, per file, we have 360Mb, more or less, but here we go from
2,73Gb to 3,81 so it is more than 1Gb, or, nearly 8Kb per file!

> This waste is per file. If you have a lot of small files...

Surely, so you have that a 1Tb 4Kb drive could end up being able to contain a
lot less files than a smaller, but 512b one!

Best regards.


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