[zfs-discuss] One dataset per user?

Arne Jansen
2010-06-21T12:29:09Z

David Magda wrote:
> On Jun 21, 2010, at 05:00, Roy Sigurd Karlsbakk wrote:
>
>> So far the plan is to keep it in one pool for design and
>> administration simplicity. Why would you want to split up (net) 40TB
>> into more pools? Seems to me that''ll mess up things a bit,
having to
>> split up SSDs for use on different pools, loosing the flexibility of a
>> common pool etc. Why?
>
> If different groups or areas have different I/O characteristics for one.
> If in one case (users) you want responsiveness, you could go with
> striped-mirrors. However, if departments have lots of data, it may be
> worthwhile to put it on a RAID-Z pool for better storage efficiency.
>

Especially if the characteristics are different I find it a good idea
to mix all on one set of spindles. This way you have lots of spindles
for fast access and lots of space for the sake of space. If you devide
the available spindles in two sets you will have much fewer spindles
available for the responsiveness goal. I don''t think taking them into
a mirror can compensate that.

--Arne