[zfs-discuss] One dataset per user?

Bob Friesenhahn
2010-06-21T15:33:06Z

On Mon, 21 Jun 2010, Edward Ned Harvey wrote:

>> From: zfs-discuss-bounces at opensolaris.org [mailto:zfs-discuss-
>> bounces at opensolaris.org] On Behalf Of Roy Sigurd Karlsbakk
>>
>> Close to 1TB SSD cache will also help to boost read speeds,
>
> Remember, this will not boost large sequential reads.  (Could
> possibly maybe even hurt it.)  This will only boost random reads.

Or more accurately, it boosts repeated reads.  It won''t help much in
the case where data is accessed only once.  It is basically a
poor-man''s substitute for caching data in RAM.  The RAM is at least
20X faster so the system should be stuffed with RAM first as long as
the budget can afford it.

Luckily, most servers experience mostly repeated reads.

Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/