SQL Server Performance

SAN Setup for diskgroups

Discussion in 'Performance Tuning for Hardware Configurations' started by humut, Jul 7, 2006.

  1. humut New Member

    Hi
    I have a customer which needs new hardware for running sql 2000 and later 2005. I have recommended dual dual-core xeon with 2MB L2, however he leans towards itanium. Does anyone have a case comparison with the two architectures?
    Secondly they are running a SAN with approx 40 spindles in pool where the diskgroups are striped along the disks. The groups can run RAID 1 or RAID 5 on top of the SAN
    The san is not dedicated
    Our normal requirement are 10 spindles in RAID 10 (write goes to 20% in peak),raid 1 for logfiles.
    How should they setup the SAN to get the same performance?



  2. joechang New Member

    the current single core Itanium 1.6GHz is really old and not competitive with the latest dual core platforms at the 1-8 socket level
    unless of course, you need 64-bit and must be on SQL2000

    the new Itanium dual core coming out soon, with the HP zx2 or sx-2000 chipset will have best of class performance at 4 sockets and up,
    the new Xeon socket coming out in a few months will be competitive.

    most itanium systems i have seen in production are 8 socket or more,
    many were not properly configured for what the application needed, and probably under performed a 4-socket

    I would recommend starting with an evaluation of the new 2-socket Xeon 51x0 line for now,
    second choice would be the Xeon 50x0 line, which is probably what you mentioned.
    this probably has best all around performance except for a few special cases that favors Opteron

    SAN tend to have poor sequential performance and cannot benefit from high queue depth operation, for 40 disks, try to have 3 FC ports.
    it is bad enough that the SAN is shared, if the disks are shared as well, make no warranties on their performance level
  3. humut New Member

    Hi
    They have 3 FC ports, and i meant the xeon 50x0 line.

    Thx for the advice.

    Since they have mirror on top of shared disks will it perform as a RAID 1+0 drive?

  4. joechang New Member

  5. humut New Member

    Hi
    well the problem is that once they have bought the hardware it seems very hard to get it changed, and if i only set up IOPS, throughput and server requirements, they'll ask their hardware vendor which has its own approach
  6. joechang New Member

    this is why you need to spec the performance requirements before the hw is purchased
    also, if the system performance is adequate, whats the point of arguing
    if not, then state that you cannot make service level guarantee because of the hw deficiency

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