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Investigating Problems with Disks
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Topic starter
My SoftRaid formatted disks are working flawlessly for several months, but noticed one little puzzler.
If I reboot, my drives don't show on the desktop, nor are they visible with the softraid App.
However, all is well when I power all the way down, wait 30 seconds, and boot up.
Posted : 28/03/2016 4:39 pm
Are these SSD drives?
What brand/size/model number?
Are they in a thunderbolt enclosure?
what brand/type?
If you simply unplug the TB cable and re-insert it a few seconds later, do they show up?
Posted : 28/03/2016 4:43 pm
Topic starter
oh, sorry ... forgot the details.
• 3x 6TB HGST Hard Drives, Model # HUS726060ALE610
• These three drives, live in the internal Bays 1-3 of my Mid 2010 MP 5.1 ("Westmere" 6 core 333GHX Tower)
• The three drives are split into 2 volumes, an 8TB RAID5, and a 4TB RAID 5.
• Mac OS 10.10.5 (Yosemite)
Posted : 28/03/2016 5:32 pm
Possibly a power supply issue.
Internal drives should be 100% reliable. Perhaps you have a high power video card? or additional drives in the Mac Pro?
Yes your mac should have plenty of power, but the drives not powering up is an indicator it does not.
Posted : 28/03/2016 5:49 pm
Topic starter
Should also add that none of the SoftRaid drives are boot drives. My system boots from an 480 OWC SSD mounted in a PCI slot. This thingy here ...
Posted : 28/03/2016 5:50 pm
We experience this exact issue with 6TB drives (Hitachi 6TB Ultrastar 7K6000) in nearly an identical installation. We have four of them in a 2010 Mac Pro and a SSD for the system drive installed in one of the optical bays. On reboots the drives won't re-mount correctly...but if you power DOWN and then do a cold boot they mount fine.
I read about this on a few different places on the Web. Its nothing to do with SoftRAID but something about the drives themselves (and possibly how they work in older host machines).
Posted : 04/08/2016 3:49 pm
Yes when we see this kind of issue, it is generally, but not always, the Power Supply in the Mac Pro.
With the 6TB drives it could be a timing issue, as I would expect the opposite behavior to happen, disks not showing up on a cold start, but showing up with a warm start.
Thanks for the tip, it well could be behavior from these drives. If you can provide the link to what you read, from a good source, we would be happy to post it here.
Posted : 04/08/2016 4:32 pm
Thanks for the tip, it well could be behavior from these drives. If you can provide the link to what you read, from a good source, we would be happy to post it here.
Some links to discussions about this:
https://discussions.apple.com/thread/8338922
https://discussions.apple.com/thread/8246354
https://discussions.apple.com/message/28638226?start=0&tstart=0
https://arstechnica.com/civis/viewtopic.php?f=19&t=1300231
Posted : 21/06/2018 10:09 am
I have direct experience over the past 2-3 years.
Not all drives have this issue, and recent evidence points to TLER being involved.
We are going to research if a workaround is possible, but this may just be an issue with how the Mac Pro deals with drives. (and not easily fixed without a special driver)
Posted : 21/06/2018 12:41 pm
