Unable to replace failed disk
I have a disk that is causing issues and am trying to replace it. The issue with the disk is that when I power on the disk enclosure, or power on the Mac with the enclosure powered on, the system hangs and goes into a loop of rebooting. Once I remove the bad disk, the system will boot and remain stable.
I have inserted a new disk into the enclosure, but I am unable to add the disk to the volume.
Also, the volume is displaying in SoftRAID two volumes instead of one. Both reporting degraded with missing disks. See attached screen shots.
This is a 4 disk raid 1+0 setup.
When I go to add a disk to either volume, I get error that I cannot add a disk to a volume that does not have enough disks to mount! That is why I am trying to add a disk, duh!
How do I get back to a mountable, usable volume?
SoftRAID XT 5.8.4
I need a SoftRAID tech support file to see what is going on. I think you can attach one.
This is a complicated problem. The issue is a disk has been removed, and I believe the other disk has split from the volume, so all that remains is a "mirror pair" which is only 50% of the 0 part of the RAID.
When was the last event since your volume was mountable? Did you pull a drive, or use "remove disk" before unplugging the disk you replaced? Was your machine shut down when this happened?
I am trying to figure out if this is fixable. While we can probably put the volume back together with the disk that is "missing three disks", if the volume mounted after that disk was separated, it will cause irrepearable directory damage.
Do you have a backup to this volume? that is the safest approach to resolving this. I would feel reluctant to ask engineering to do a "repair", when the result could not be a usable volume.
This issue was caused due to a power outage. When the power restored and the system was booted it would go into a panic loop during the boot process, causing the system to keep panicking and reboot. I turned off the disk enclosure and was able to boot the system without issue. I then turned on the enclosure while having SoftRAID UI up and could see only 3 of the four disks and was received pop-up stating that a disk was missing. Then the system would hang and panic again going back into boot loop until I turned off the enclosure.
I removed the disk that was no showing up in the UI and the system would then boot without issue and this is the state we are in now. I do not believe that the volume has successfully mounted since the disk died.
I do not have a backup of this volume, so ideally I would like to make every effort to repair it.
If you disable Auto rebuilding, then connect the enclosure, does it still panic? (RAID preferences)
If you can get the 4th drive in the set, the volume may be mountable.
Sorry about this lets do it this way:
Connect only 2 of the 4 disks (assuming this is a 4 disk volume)
Create a SoftRAID tech support file.
Connect only the other 2 disks
Create a SoftRAID tech support file.
Send me both of them, at least we can see the disks and what is going wrong.
I need the support files to see what is going on, then I can make recommendations.
You see the disk that is failing? remove that and send me a support file with the other 3 connected. I hope the volume can be put together. I was assuming this was a RAID 5 volume, not RAID 10.
The disk that shows as failing is predictive failure based on SMART data. The disk that is actually failed does not appear in Disk Utility or SoftRaid when it is attached, and the system will crash within a few minutes of attaching this failed drive. Attached is support files with the 3 functional disks, and another with the bad disk inserted and disk that indicates predictive failure removed (as requested)