I have a db (tables with up to 5,000,000 records, up to 70 columns x 1,500,000 records, around 50Gb of disk space for the database (incl data, indexes, etc) Most records have PostGIS geometry columns, which work very well. For read performance this is on a (2 yr old) Linux box with 2x software RAID 0 (striped) WD 10,000RPM Raptor drives. FWIW bonnie gives reads at about 150Mb/sec from the filesystem. We have been more than happy with performance. though the 4Gb of RAM helps.... For data security, pg_dump backs it up every second day onto another 250Gb drive on the box, & this is copied over the LAN to another server which is backed up to tape every day. It works for us :-) Cheers, Brent Wood >>> Ow Mun Heng <Ow.Mun.Heng@xxxxxxx> 08/19/08 4:00 PM >>> On Mon, 2008-08-18 at 11:01 -0400, justin wrote: > Ow Mun Heng wrote: > > -----Original Message----- > > From: Scott Marlowe <scott.marlowe@xxxxxxxxx> > > > > > If you're looking at read only / read > > > mostly, then RAID5 or 6 might be a better choice than RAID-10. But > > > RAID 10 is my default choice unless testing shows RAID-5/6 can beat > > > it. > > > > > > > I'm loading my slave server with RAID-0 based on 3 IDE 7200 Drives. > > Is this worst off than a RAID 5 implementation? > > > > > > > I see no problem using Raid-0 on a purely read only database where > there is a copy of the data somewhere else. RAID 0 gives performance. > If one of the 3 drives dies it takes the server down and lost of data > will happen. The idea behind RAID 1/5/6/10 is if a drive does fail > the system can keep going. Giving you time to shut down and replace > the bad disk or if you have hot swappable just pull and replace. I'm looking for purely read-only performance and since I didn't have the bandwidth to do extensive testing, I didn't know whether a RAID1 or a Raid 0 will do the better job. In the end, I decided to go with RAID 0 and now, I'm thinking if RAID1 will do a better job. > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
