On 01/04/2015 22:17, John Spray wrote:
Once you have found the block device and reported it in the OSD
metadata, you can use that information to go poke its LEDs using
enclosure services hooks as you suggest, and wrap that in an OSD
'tell' command (OSD::do_command). In a similar vein to finding the
block device, it would be a good thing to have a config option here so
that admins can optionally specify a custom command for flashing a
particular OSD's LED. Admins might not bother setting that, but it
would mean a system integrator could optionally configure ceph to work
with whatever exotic custom stuff they have.
One more thought occurs to me -- one of the main cases where you'd want
to flash an LED would be to identify the drive of an OSD that is
down/out due to a dead drive. In that instance, the ceph-osd process
wouldn't actually be running, so you wouldn't be able to send it the
'tell' to flash the LED.
I guess in this interesting case you could either:
* Allow other OSDs on the same host to handle the 'tell blink' command
for the dead OSD's drive
* Leave this to calamari/whoever to read the dead OSD's block device
path from "ceph osd metadata", and go blink the LEDs themselves.
Cheers,
John
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