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Question related to moving tempdb files into different disk drive

  • June 10, 2020 at 6:36 am

    #3761873

    Hi everyone. I asked this question in dba.stackexchange.com but unfortunately I wasn't satisfied with answers so I decided to ask here.

    Question:  is there any point of moving tempdb files into different disk drive if all LUNs are from the same RAID pool?

    According to best practices, it is recommended to move all tempdb (not just tempdb) files into different physical disk. I have a virtual server which had originally 4 LUNs from the same RAID 10 pool. By the help of volume manager, I converted those 4 LUNs into 4 different volumes. Now the question is, will it make any difference in terms of performance by moving tempdb into separate volume, if those volumes are actually originated from the same raid pool?

    • This topic was modified 4 years, 6 months ago by  RaufDBA.

  • June 10, 2020 at 12:57 pm

    #3761962

    Yes on keeping it on a separate assigned drive letter.  I find that it's important to keep TempDB associated with a different drive letter than all the rest so that someone's nasty code mistake doesn't cause TempDB to fill an entire data drive.  It just keeps things simpler.

    As far as performance goes, it you can put TempDB on Raid 1/0, it'll be faster.  Of course, not much difference if it's on SSDs.  Just be aware that TempDB is a bit tough on the lifetime of whatever SSDs you put it on.

     

    --Jeff Moden

    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.

    Helpful Links:
    How to post code problems
    How to Post Performance Problems
    Create a Tally Function (fnTally)

  • June 10, 2020 at 4:54 pm

    #3762045

    In addition to what Jeff noted, if you get to move this to different hardware or change the makeup of the LUN, having a different drive letter provides some abstraction.

  • June 10, 2020 at 5:30 pm

    #3762056

    Thank you guys for your valuable time and answers. I am now satisfied with answers.

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