The volume main (ZFS) state is DEGRADED: One or more devices could not be opened. Sufficient replicas exist for the pool to continue functioning in a

[mmon]

I tried to upgrade 9.10 to 11.3 and it failed. So I rebooted in 9.10. After that the main zfs were degraded. I still can access data and has not lost any data yet. I need help :(.

I attached the screen shot

 

[c77dk]

looks like you have lost a disk - 1. thing I would do is to make sure all cables are attached correctly. With the amount of disks I assume you're not using a backplane.

 

[mmon]

looks like you have lost a disk - 1. thing I would do is to make sure all cables are attached correctly. With the amount of disks I assume you're not using a backplane.

not I am not using backplane. I have checked all the cables. I have made disconnected and reconnected again and again. I try to replace the drive, it shows "Disk is not clear, partitions or ZFS labels were found"

 

[Redcoat]

You need to fully wipe that disk before attempting to use it as a replacement - this thread covers the steps https://www.ixsystems.com/community/threads/operation-not-permitted-when-trying-to-wipe-disks.69240/

 

[mmon]

You need to fully wipe that disk before attempting to use it as a replacement - this thread covers the steps https://www.ixsystems.com/community/threads/operation-not-permitted-when-trying-to-wipe-disks.69240/

thank you I will try