Supposing a 50% performance increase disk-by-disk with 15.000rpm vs 10.000rpm you would get better performance (100%) by doubling number of disks versus using 15K rpm disk (50%). However, you have to check other parameters, for example, if your RAID controller can deal with such a high bandwidth or the disk cache size. Do you have benchmarks about these hard disk models ?
How about using SSD? ;-) -----Original Message----- From: Anj Adu <fotogra...@gmail.com> To: pgsql-admin@postgresql.org Subject: [ADMIN] more 10K disks or less 15K disks Date: Wed, 28 Apr 2010 11:27:26 -0700 I am faced with a hardware choice for a postgres data warehouse (extremely high volume inserts..over 200 million records a day) with a total storage of either 12 x 600G disks (15K) (the new Dell Poweredge C server) or 24 x 600G (10K disks) ALL direct attached storage. I am leaning toward the 24 disks as I expect the higher number of disks to provide overall better performance under high loads Does anyone have any experience with a mixed 10K / 15K DAS storage that you can share. Thank you Sriram
