Re: Best practice with 0.48.2 to take a node into maintenance

[Christopher Kunz <chrislist@de-punkt.de>]

Am 03.12.12 20:14, schrieb Josh Durgin:
> On 12/03/2012 11:05 AM, Oliver Francke wrote:
>> Hi *,
>>
>> well, even if 0.48.2 is really stable and reliable, it is not
>> everytime the case with linux kernel. We have a couple of nodes,
>> where an update would make life better.
>> So, as our OSD-nodes have to care for VM's too, it's not the problem
>> to let them drain so migrate all of them to other nodes.
>> Just reboot? Perhaps not, cause all OSD's will begin to
>> remap/backfill, they are instructed to do so. Well, declare them as
>> "osd lost"?
>> Dangerous. Is there another way I miss in doing node-maintenance?
>> Will we have to wait for bobtail for far less hassle with all
>> remapping and resources?
>
> By default the monitors won't mark an OSD out in the time it takes to
> reboot, but if maintenance takes longer, you can drain data from the
> node.
Hi,

what time is that (in seconds) and how can we reliably test this?

Regards,

--ck