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 ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
