Re: Advice for implementation of LED behavior in Ceph ecosystem

[John Spray <john.spray@redhat.com>]

On 01/04/2015 23:04, 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.
Sorry, mental lapse: we're not talking about phoning home, we're talking 
about flashing the LED.  So perhaps ceph-disk itself could be modified 
to flash an LED on a drive if it has a GPT partition ID for a ceph osd 
but we can't mount it or start an OSD service.

John