Chris Barnes wrote:
What is the preferred setup for postgres concerning cache settings on the controller and disks and the preferred block size allocated for the disks when postgres uses block size 8192?
Controller settings
Read-cache mode - Enabled
Write-cache mode - Enabled (write-back)
Write-cache setting - Enabled (write-back) when protected by battery
Stripe-unit size : 256 KB
Disk setting
Write Cache : Disabled (write-through)
You already have the right cache settings: write-back when protected by battery, write cache on disks disabled. And there aren't any interesting settings to change for block of stripe size on a RAID10 array that do anything you'll be able to measure. You're done with controller and disk setup.
Looks like a standard ext3 filesystem under Linux, right? Next you should run tests with bonnie++ to make sure the array is performing as expecting.
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Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com www.2ndQuadrant.us
