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Hi all!
We have a 30tb Raid 5 Thunderbay 4 RAID, with 4x 10tb drives installed. Recently, it started unmounting for no apparent reason, and we think we have narrowed this down to a bad Thunderbolt cable. The disk now mounts fine, but after a restart we get a warning that it is in read-only mode and Softraid is saying its missing one or more disks from the array. All files are read-only accessible in Finder.
The disk pane is showing one disk as "out-of-sync- rebuiliding"
The Volumes pane in Softraid is saying "Raid 5 " - degraded - safeguard enabled - no errors- rebuilding - current offset 1 616 904 192"
No real indicator on time/progress. Should the machine just be left to deal with this on its own?
MacPro, macOS 10.14.6. Softraid XT v 5.8.3 and driver 5.8.3
Thanks for any input!
Posted : 27/11/2020 6:46 am
You need Disk Warrior to replace the directory first. then it will rebuild.
Posted : 27/11/2020 4:18 pm
I have this issue too. I am on Sierra and Mojave. Which version of Diskwarrior is feasible for performing this operation? Do we just run DW on the disk and then softraid will go back in sync?
I have 4 new 10TB drives installed so does the out of sync error rule out any hardware issues with the drive? Should I run Drive DX on the individual drives in the array?
Is this a common issue and if so what usually causes it?
Posted : 06/12/2020 4:20 am
You run Disk Warrior 5.2 on your volume. It should be able to rebuild / replace the directory. Once that happens, SoftRAID should rebuild, or may require a restart first.
Let us know.
DriveDx is not doing anything different than SoftRAID, except perhaps guessing at new predictive failure ideas. The only data that is statistically proven are related to reallocated sectors. Other factors may seem relevant, but in two major studies of large disk populations, were not related to disk failures. So SoftRAID's predictive failure is adequate, even if it does not have all the fancy extra tests, we do not want to get into testing for testing's sake, just to predict failure on disks that are showing known failure symptoms.
Directory damage is not uncommon. it is more prevalent these days, as my theory is macOS on SSD/flash media shuts down faster than the file system expects, not giving media enough time to write cache memory to disk. Plus, it seems to write for a long time to disks, after volumes are unmounted. Generally most incidents of directory corruption appear after driver installs, or OS updates, from what I have seen.
So running Disk Warrior monthly or regularly, seems to be a good idea.
Posted : 06/12/2020 1:20 pm
