SQL Server Performance

write-back / write-thru

Discussion in 'Performance Tuning for Hardware Configurations' started by brimba, Aug 16, 2005.

  1. brimba New Member

    Hello!

    On our raid controller we can choose between write-back and write-thru.

    I have read that write-back could cause corrupt data with use with sql-servers.
    So most tips says that write-back should be turned off, but does that mean I should choose write-thru?

    Should I choose write-thru instead?
  2. satya Moderator

    Write Policy: Default is "Write-Back" (also have "Write-thru" available)

    If you have a controller that supports write-back caching, you should make sure that you have a battery backup. The backup unit will preserve the contents of the controller's onboard RAM even when the power fails, so you won#%92t lose data due to a sudden outage. Note that even with a backup battery, you can still lose data—say, if the controller itself fails and you have to pull it—but a backup unit is a good safety measure nonetheless.


    If not choose write-thru only.


    Satya SKJ
    Moderator
    http://www.SQL-Server-Performance.Com/forum
    This posting is provided “AS IS” with no rights for the sake of knowledge sharing.
  3. brimba New Member


    Ok, thank you!

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