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New Servers - Sata vs SCSI and RAID Options

  1. #1


    TheScullster Guest

    New Servers - Sata vs SCSI and RAID Options

    Hi all

    I am looking to replace our ageing File/Print and Exchange servers and would
    welcome opinion on the above subjects:

    For the drive arrays, there seems to be a trend towards SATA drives for
    array builds.
    I have approx 20 PC users running SATA drives, with no failures in the last
    five years.
    However I have had 2 failures in 6 months in a cluster of 4 servers running
    SCSI arrays.
    This would tend to support the argument for SATA.

    Once the drive type has been decided, what is the preferred drive
    configuration?
    Mirrored system drives and RAID 5 data
    OR
    RAID 5 array for both system and data?
    I am looking for around 2 TB

    Any comments on the above opions appreciated.

    Phil



      My System SpecsSystem Spec

  2.   


  3. #2


    Phillip Windell Guest

    Re: New Servers - Sata vs SCSI and RAID Options

    I always do a mirror on the system drive and RAID5 on the rest.

    Regardless of what problams you may have had with your SCSI setup I still
    consider SCSI more reliable. The problem may be your particular hardware
    brand or model,...or just bad luck.

    I have seen a ton of trouble with custom built machines. I have had little
    to no trouble with machines from major vendors like Dell. The worse I have
    had to do with my Dells is update the Firmware on both the Controller and
    the Drives (which should always be done anyway), and I might have had to
    re-seat a drive one or twice.


    --
    Phillip Windell

    The views expressed, are my own and not those of my employer, or Microsoft,
    or anyone else associated with me, including my cats.
    -----------------------------------------------------


    "TheScullster" <phil@newsgroup> wrote in message
    news:qY6dncKmXINC9_3WnZ2dnUVZ7vydnZ2d@newsgroup

    > Hi all
    >
    > I am looking to replace our ageing File/Print and Exchange servers and
    > would welcome opinion on the above subjects:
    >
    > For the drive arrays, there seems to be a trend towards SATA drives for
    > array builds.
    > I have approx 20 PC users running SATA drives, with no failures in the
    > last five years.
    > However I have had 2 failures in 6 months in a cluster of 4 servers
    > running SCSI arrays.
    > This would tend to support the argument for SATA.
    >
    > Once the drive type has been decided, what is the preferred drive
    > configuration?
    > Mirrored system drives and RAID 5 data
    > OR
    > RAID 5 array for both system and data?
    > I am looking for around 2 TB
    >
    > Any comments on the above opions appreciated.
    >
    > Phil
    >


      My System SpecsSystem Spec

  4. #3


    Leythos Guest

    Re: New Servers - Sata vs SCSI and RAID Options

    In article <qY6dncKmXINC9_3WnZ2dnUVZ7vydnZ2d@newsgroup>,
    phil@newsgroup says...

    > RAID 5 array for both system and data?
    > I am looking for around 2 TB
    >
    I would rather see you install 4 x 1TB drives in a RAID 0+1 or 1+0
    setup, you get speed and redundancy.

    Normally I would setup an OS partition for 100GB, since space is cheap
    and running out of space is a PITA. Use the rest for your data.

    As for SATA, SAS, SCSI.... SAS/SCSI perform well, SATA is still slow. If
    you get a caching raid controller for the SATA you may not see the
    performance difference with 20 users.

    --
    You can't trust your best friends, your five senses, only the little
    voice inside you that most civilians don't even hear -- Listen to that.
    Trust yourself.
    spam999free@newsgroup (remove 999 for proper email address)

      My System SpecsSystem Spec

  5. #4


    TheScullster Guest

    Re: New Servers - Sata vs SCSI and RAID Options

    Thanks to all respondents

    Plenty of food for thought there.

    Phil



      My System SpecsSystem Spec

  6. #5


    Phillip Windell Guest

    Re: New Servers - Sata vs SCSI and RAID Options

    "David Kerber" <ns_dkerber@newsgroup_warrenrogersassociates.com> wrote in message
    news:MPG.25cce77caeb589c39896bb@newsgroup

    >> When a single drive fails in a RAID 10/01 setup you really don't see a
    >> significant performance hit.
    >
    > You will when you start rebuilding the failed disk.

    >> If you have a 3 or 4 drive R5 setup and a single drive fails you will
    >> see a SIGNIFICANT PERFORMANCE HIT.
    >
    > Only once you replace the failed drive and start rebuilding it. If you
    > continue to operate with the failed drive in place, you no longer have
    > the redundancy, but the speed isn't hurt.
    That's what I thought too. Even with the debate over speed the difference
    in speed (during *normal* operation) is so miniscule to not even be
    "humanly" perceivable. I have never been in a situation where the drive
    speed was the bottleneck. It was always the Network throughput that held
    things up.

    --
    Phillip Windell

    The views expressed, are my own and not those of my employer, or Microsoft,
    or anyone else associated with me, including my cats.
    -----------------------------------------------------



      My System SpecsSystem Spec

  7. #6


    David Kerber Guest

    Re: New Servers - Sata vs SCSI and RAID Options

    In article <OMp3W8QoKHA.4648@newsgroup>,
    philwindell@newsgroup says...

    >
    > "David Kerber" <ns_dkerber@newsgroup_warrenrogersassociates.com> wrote in message
    > news:MPG.25cce77caeb589c39896bb@newsgroup

    > >> When a single drive fails in a RAID 10/01 setup you really don't see a
    > >> significant performance hit.
    > >
    > > You will when you start rebuilding the failed disk.
    >

    > >> If you have a 3 or 4 drive R5 setup and a single drive fails you will
    > >> see a SIGNIFICANT PERFORMANCE HIT.
    > >
    > > Only once you replace the failed drive and start rebuilding it. If you
    > > continue to operate with the failed drive in place, you no longer have
    > > the redundancy, but the speed isn't hurt.
    >
    > That's what I thought too. Even with the debate over speed the difference
    > in speed (during *normal* operation) is so miniscule to not even be
    > "humanly" perceivable. I have never been in a situation where the drive
    > speed was the bottleneck. It was always the Network throughput that held
    > things up.
    I have some highly disk-intensive processes that run in the middle of
    the night that I have found are limiting my backup speed while the
    network is nowhere near being saturated, but those kinds of situations
    are going to be rare for most applications.

    I suppose one situation where a failed HD in a raid array may cause
    throughput issues, MIGHT be if you have a software raid instead of a
    hardware controller. That's just speculation on my part, though,
    because I've never had the nerve to try software raid.

    D

      My System SpecsSystem Spec

  8. #7


    Falcon ITS Guest

    Re: New Servers - Sata vs SCSI and RAID Options

    Hello,

    I agree with all the prior posts : SAS or SCSI for RAID and definitely
    Hardware RAID.

    Important: use a GOOD raid controller, LSI, Adaptec, Mylex. Stay away
    from cheapies. I have witnessed horrible experiences with low end SATA
    drives and SATA RAID controllers even from well known companies (that
    make CPU's and GPU's) where I have witnessed corrupt data when one
    drive fails, clueless tech support personnel and buggy drivers and
    product discontinuation w/o future support. Low end RAID controllers
    bring headaches instead of preventing them.

    The Adaptec and LSI controllers on Dell Servers sunning SCSI or SAS
    have been VERY reliable for me. I have never had problems with either
    and doubtful I ever will (knock on wood). I have 6+ year old models
    out in the field that have had failed drives. I replaced the drives,
    rebuild, no problems, no lost data, no worries, no headaches. Worth
    the $.

    Good luck,

    Miguel Fra / Falcon ITS
    http://www.falconits.com



      My System SpecsSystem Spec


New Servers - Sata vs SCSI and RAID Options