I am currently running the trial version of UnRaid on my R710 for a few weeks, and have been pretty happy so far. However, I bought a brand new 2 TB drive on prime day (Seagate ST2000LX001). I was going to add it to my array of two 4 TB disks but things aren't working out as smoothly as the previous drives. At first when I went to perform anything on the drive, it disappeared from unassigned devices. I switched the slot it was in just in case that was an issue and it appeared.
I ran a preclear then afterwards was unable to use it. Unraid wouldn't let me run a smart test as it had to be spun up. However it wouldn't spin up. Everything was greyed out. After reset, it wouldn't even show up. I ended up removing the drive and formatting it outside of the unraid box and reinserting it before it would pop up. I then formatted it in Unraid and added it to the array. I thought everything was fine, then after a couple hours the drive becomes missing. It won't recognize it again. I have tried drive slots from both SAS bays.
I have been having this battle for days. After a format it shows up almost every time only to disappear when I try to perform any actions such as adding it to the array and starting a rebuild. The drive is recognized in the BIOS and shows up in UnRaid system devices. The SMART results seem fine with no pending or reallocated sectors and passes every test I have thrown at it when unraid would let me. I have also tested the drive multiple times on other computers without issue.
I looked at the system log and found this around the time that it disappeared after trying to do a rebuild on it:
Jul 23 13:52:22 R710 emhttp: err: ckmbr: read: Input/output error
Jul 23 13:52:22 R710 emhttp: ckmbr error: -1
Jul 23 13:52:22 R710 kernel: sd 2:0:5:0: Device offlined - not ready after error recovery
Jul 23 13:52:22 R710 kernel: blk_update_request: I/O error, dev sde, sector 0
Any help would be greatly appreciated.
r710-diagnostics-20170723-1432.zip
r710-syslog-20170723-1434.zip