Web Reference: Nov 26, 2009 · RAID level 5: RAID level 5 is well suited for medium to large workloads. RAID5 requires at least three disk drives, but the more drives you place in a RAID5 array the faster it generally runs and the better it handles heavy parallel load. This article covers basic recommendation for setting up and configuring Disk Arrays, RAID and Disk Layout for your Postgresql database server. No-Read-Ahead: Selecting no-read-ahead policy indicates that the controller should not use read-ahead policy. You want a good RAID controller that can keep up with 8 fast HDDs (that's actually not a given). If you have a fair amount of writes to your DB, then you really want a Battery Backup Unit, and to enable battery-protected write caching on the RAID controller.
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