Different drives for the LDF and the MDF.

  • I have a question about the placement of the LDF and the MDF files for a MSSQL database. I am using SQL 7.0 and 2000 all with the latest service packs.

    In a RAID 5 configuration it is my understanding that all drives behave as one with a parity stripe to keep track of where the data is (simplified I know). Now if the drives are partitioned into separate logical drives is there any real performance gain by putting the mdf on a different logical from the ldf?

    The same question goes for a clustered environment where there are logical drives represent the clustered drives.

    Thanks is advance for any responses.

  • If you have one RAID 5 array and divide that single array into two logical partitions, then no - there will be no performance gain for this type of partitioning. It's only a logical partitioning - it yields no more spindles or heads that can work in parallell as separate physical partitions do.

    You would probably end up with less performance doing this.

    /Kenneth

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