On Wed, 18 Mar 2015 14:00:15 -0700, you wrote: >The disk errors were a red herring. The system had a Seagate USB disk >plugged into it which I was not aware of. (It was less not obvious >because of the rats nest of cables behind it.) This disk's partition >table was marked bootable - even though there was nothing on that disk >which would have supported a boot. This was the disk that was showing >up as /dev/sdb. When CentOS booted normally it was automatically >mounting this disk, which is why there was no mention of it in >/etc/fstab. However, nothing was using this disk. It looks like at 30 >minute intervals the OS "pinged" the device to see if it was still >there, and the enclosure/disk did not fully support whatever command was >being used for this operation, resulting in the sense error messages in >the log files. When the rescue DVD was >used it saw this device, created /dev/sda for it (yes, device names were >exchanged in the two environments) and didn't mount it.
Linux does not guarantee device names to remain the same, which is why partitions are usually mounted via a unique partition ID in /etc/fstab _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
