Why is my Pegasus R6 so slow?

Discussion in 'Mac Accessories' started by chfilm, Jan 13, 2014.

  1. chfilm macrumors 65816

    chfilm

    Joined:
    Nov 15, 2012
    Location:
    Germany
    #1
    Hi,

    I've got a promise pegasus r6 12Tb raid with tb1 since one year now.

    Recently I noticed that my read speeds seem to have dropped.
    I now can only get around 400 mb/s read max, while before I would get around 600 mb/s. The drive is still more than half empty.

    I realized that in the promise utility it says the interface of my drives would be 3gb/s S-ata. But They are Seagate ST2000DM001 Barracuda 2TB SATA60 S-ata3 drives with a 6gb/s interface.
    Any ideas what to do about the slow speed?
     
  2. satcomer macrumors 603

    satcomer

    Joined:
    Feb 19, 2008
    Location:
    The Finger Lakes Region
    #2
    Did you check your cables to make sure the are at least 5E or 6. Plus is thus network in your home or at work?
     
  3. chfilm thread starter macrumors 65816

    chfilm

    Joined:
    Nov 15, 2012
    Location:
    Germany
    #3
    What do you mean E5 or 6?

    It's at home.
    I'm in touch with Promise support now.. but they wanted me to generate a report file and I cant find out where the promise utility saves those..
     
  4. psfahey macrumors newbie

    Joined:
    Feb 14, 2014
    Location:
    Tacoma
    #4
    R6 is locked at 3Gb "for reliability reasons"

    As unbelievable as it sounds, I was told by Promise tech support that, when the Pegasus R6 was released, it did allow disks to connect to the internal controller at 6Gb. But a subsequent firmware update "locked" the rate down to 3Gb. He said it was done to address "reliability issues".

    This to me is mindboggling. The whole thing about the R6 is speed. Why cut the throughput in half rather than just fix the original problem?

    It also borders on (if not a clear case of) misrepresentation, as their ads clearly say it supports SATA III (6Gb).

    Not too cool, Promise!

    -Pat
     
  5. xraydoc macrumors demi-god

    xraydoc

    Joined:
    Oct 9, 2005
    Location:
    192.168.1.1
    #5
    The Promise connects over Thunderbolt, not Ethernet.
     
  6. carestudio macrumors 6502

    Joined:
    Aug 6, 2008
    #6
    Do you disks still have space? the more you use, the slower you would get, that's the spinning disks.

    I am wondering what type of reliability Promise was talking about? It would scare me away. I was just thinking about buying a Promise Thunderbolt 2 storage. Looks like I must look for other better choice such as CalDigit T3 thunderbolt drive. They are running big promotion now, less than 1000 bucks and you get two thunderbolt devices, one is their docking station and one is T3 storage. Their quality and support are way better than Promise.
     
  7. psfahey macrumors newbie

    Joined:
    Feb 14, 2014
    Location:
    Tacoma
    #7
    Reliability Issues

    I purchased the R6 about a year ago. At that time a lot of people were complaining about drops in the data stream. It was bad enough that it was disrupting communication with the device. Again, this is R6 version1, not the new version 2 with TBII.

    I never had any comms problems with mine, and shortly after that the complaints seemed to go away. At the time people were thinking that the TB cables were getting some type of RF interference by being too close to other cables and devices.

    When I was only seeing 350-400 MB of throughput, I called tech support and that's when they told me about the SATA limitation. The device has been rock-solid and the only problems I've had, I've caused.

    Granted, 350-400MB is really fast, but nothing like the nearly 800MB the device is capable of.

    One other note: tech support for the Pegasus devices is VERY good. They are easy to get to, and they know what they are doing.

    -Pat
     
  8. satcomer macrumors 603

    satcomer

    Joined:
    Feb 19, 2008
    Location:
    The Finger Lakes Region
    #8
    My bad, bad day for me. :(
     

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