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dojobel's avatar
dojobel
Tutor
Nov 30, 2018
Solved

ReadyNAS Pro 4 Kernel Panic

Hi guys,   I've got a ReadyNAS Pro 4 that seems to be kernel panicking on occasion (usually every few days). The LCD will display "_raw_spin_lock_bh+16" when this occurs and I have to perform a h...
  • dojobel's avatar
    dojobel
    Mar 28, 2019

    Hi guys,

     

    Sorry it's a few months down the track now but I thought I better do the right thing and come back in case anyone else experiences this. It looks like with the combination of heavy I/O from the maintenance tasks coupled with heavy I/O on the backup LUN stored on it (there are regular backups every 3 hours) was starving the RAID volume of IOPS and effectively crashing the OS because it couldn't write to it's disks quickly enough. The balance appears to have just been the symptom of that problem.

     

    Unfortunately I can't say anything for certain, but I SSH'd into the NAS and watched it under load and the CPU was really struggling and the load averages were really high. I've adjusted my backup schedules to try and avoid heavy writes during the hours the NAS could potentially be doing maintenance and it hasn't crashed since.

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