Promise Pegasus R4 8tb LONG synchronization

Discussion in 'Mac Accessories' started by SamPhoto, Feb 20, 2013.

  1. SamPhoto macrumors member

    Nov 30, 2007
    It's been 48hrs since I installed a Promise Pegasus R4 8tb Thunderbolt drive. The literature that came with it says synchronization takes around 10 hrs. I have heard others report it takes longer (as long as 30hrs), and I guess that depends on whether it's 4tb or 8tb. So after running 48hrs the synchronization on mine is at 66%.

    One call to tech support said to set the Background Synchronization Rate in the Promise Utility to "High" which I did. If it made a difference I'm not seeing it. The first 45% of the sync took around 24hrs and now it's taking forever.

    I made a second call to Promise tech support as well as emailing them system file generated by the software, and they say nothing is wrong with the drive.

    As it is now, it's going to take 3-4 days to synchronize this drive as opposed to 10 hrs. Anyone else have this happen?
  2. puraw macrumors newbie

    Aug 3, 2011
    I'm having the same problem. 30 hours and only 52%. Did the pegasus eventually synchronize?
  3. joema2 macrumors 68000


    Sep 3, 2013
    I have the same problem. On an 8TB R4, after 49 hours, synchronization was at 65%. Promise tech support said that was abnormal, suggested using Promise Utility to change background synchronization rate to 'high', then re-start sync. I did that and the sync rate improved a little.

    After 12 more hours running background synchronization as 'high', it progressed from 65% to 75%. That is slightly faster: 1.2% per hour vs the previous 0.75% per hour. However it would still take 83 hours if the entire sync ran at that rate.

    Used the Promise Utility to generate a subsystem report and sent it to Promise tech support.

    This is on a 2013 iMac 27, 3.5Ghz i7, 32GB RAM, 3TB Fusion Drive, GTX-780M video, Mac OS X 10.8.5.
  4. joema2 macrumors 68000


    Sep 3, 2013
    Problem traced to older firmware on the Pegasus R4 drive array, which caused slow synchronization.

    It was delivered with version 5.02.0000.70. I used the procedure outlined at this Promise KB article to update it:

    Latest version is 5.02.0000.98. After doing that I used the Promise disk management utility to delete the logical volume, re-created a new RAID 5 volume (8 TB unformatted, 6 TB after RAID 5 formatting). The synchronization rate was improved to about 10% per hour, which is vastly faster than before. This is also with background synchronization rate set to 'high'.

    The entire 8TB four-drive RAID 5 array will sync in about 10 hr, which only needs to be done one time. The drive can actually be used during this period, but activity slows down the sync.

    If one of the four physical drives fail, the array will re-sync after replacing the failed drive. I don't know what that sync time is.

    Firmware version and other info can be inspected by using the Promise utility, clicking on Subsystem Information, then selecting "Save Service Report". That produces an html file with the info.
  5. joema2 macrumors 68000


    Sep 3, 2013

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