Re: Advice for implementation of LED behavior in Ceph ecosystem

[Mark Nelson <mnelson@redhat.com>]

On 04/01/2015 05:04 PM, John Spray wrote:
> On 01/04/2015 22:57, Mark Nelson wrote:
>> It seems to me that the OSD potentially would flash the LED on it's
>> way down if it thinks it's drive is dead/dying?
> That's a good idea for the case where ceph-osd is proactively
> identifying a failing drive.  I'm also thinking about the case where we
> come back from a reboot and a drive is sufficiently unreadable that
> ceph-disk doesn't see the OSD partitions and ceph-osd never gets
> started, or the OSD's local filesystem is unmountable.  Because the
> keyring lives on that local filesystem, OSDs couldn't phone home in that
> case, even to report a failure.

If things are that bad, I think it should get picked up lower in the 
stack.  IE there should be some kind of daemon on the system that knows 
when there are scsi errors or whatever and blinks drives that are that 
far gone (in the case of RAID controllers, they may already do this anyway).

>
> John