Re: One host with 24 OSDs is offline - best way to get it back online

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Dear Chris,

Thanks for your feedback. The node/OSDs in question are part of an erasure coded pool and during the weekend the workload should be close to none.

But anyway, I could get a look on the console and on the server; the power is up, but I cant use any console, the Loginprompt is shown, but no key is accepted.

I’ll have to reboot the server and check what he is complaining about tomorrow morning ASAP I can access the server again.

Fingers crossed and regards. Götz



Am 26.01.2019 um 23:41 schrieb Chris <bitskrieg@xxxxxxxxxxxxx>:

It sort of depends on your workload/use case.  Recovery operations can be computationally expensive.  If your load is light because its the weekend you should be able to turn that host back on  as soon as you resolve whatever the issue is with minimal impact.  You can also increase the priority of the recovery operation to make it go faster if you feel you can spare additional IO and it won't affect clients.

We do this in our cluster regularly and have yet to see an issue (given that we take care to do it during periods of lower client io)

On January 26, 2019 17:16:38 Götz Reinicke <goetz.reinicke@xxxxxxxxxxxxxxx> wrote:

Hi,

one host out of 10 is down for yet unknown reasons. I guess a power failure. I could not yet see the server.

The Cluster is recovering and remapping fine, but still has some objects to process.

My question: May I just switch the server back on and in best case, the 24 OSDs get back online and recovering will do the job without problems.

Or what might be a good way to handle that host? Should I first wait till the recover is finished?

Thanks for feedback and suggestions - Happy Saturday Night  :) . Regards . Götz

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