Home Forums SQL Server 2012 SQL 2012 - General Going all solid state drives - latch timeout - large buffer cache RE: Going all solid state drives - latch timeout - large buffer cache

  • May 27, 2017 at 8:06 am

    #1944418

    Indianrock - Saturday, May 27, 2017 7:55 AM

    Ok that's what I thought.   So with that being near 100% ( except sometimes during evening index maintenance ), it's not clear how much help we're going to get from SSDs. 

    The way SQL works, and the specific way that counter works, it will ALWAYS be close to 100%, even if there's massive amounts of data being read off disk.
    Go read Jonathan Kehayias's blog post on why that counter is useless.

    That counter being at 100% does not mean that the disks are not being touched. Even if it did, there's still the writing portion of disk usage on data modifications.

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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