Dnia poniedziałek, 21 listopada 2005 10:34, Mario Splivalo napisał:
> On Sun, 2005-11-20 at 11:53 -0600, Jim C. Nasby wrote:
> > Two general comments: most people find that Opterons perform much better
> > than Xeons. With some versions of PostgreSQL, the difference is over
> > 50%.
>
> Could you be more specific on that? Which version of Postgres perform
> better on Opteron than on Xeon?
Try http://85.128.68.44 - I made some test about Xeon and Opteron
>
> > RAID5 generally doesn't make for a fast database. The problem is that
> > there is a huge amount of overhead everytime you go to write something
> > out to a RAID5 array. With careful tuning of the background writer you
> > might be able to avoid some of that penalty, though your read
> > performance will likely still be affected by the write overhead.
>
> RAID5 was not ment to improve performance, but to minimize disaster and
> downtime when your hard disk dies. We're using RAID5 with postgres. In
> the last 3 years we changed 5 disks, but the system downtime was zero
> minutes.
I'm ready enough to put some tests about different RAID's for Postgresql - but
I will soon. However almost all people I know preffer RAID10 for database
like PGSQL.
Marcin
>
>
> Mike
