On Tue, 6 Feb 2018 13:01:12 +0530 Karun Josy wrote:
> Hello,
>
> We are seeing slow requests while recovery process going on.
>
> I am trying to slow down the recovery process. I set osd_recovery_max_active
> and osd_recovery_sleep as below :
> ----------
> ceph tell osd.* injectargs '--osd_recovery_max_active 1'
> ceph tell osd.* injectargs '--osd_recovery_sleep .1'
> ----------
What version of Ceph, in some "sleep" values will make things _worse_!
Would be nice if that was documented in like, the documentation...
>
> But I am confused with the osd_recovery_max_chunk. Currently, it shows
> 8388608.
>
> # ceph daemon osd.4 config get osd_recovery_max_chunk
> {
> "osd_recovery_max_chunk": "8388608"
>
>
> In ceph documentation, it shows
>
> -----------
> osd recovery max chunk
> Description: The maximum size of a recovered chunk of data to push.
> Type: 64-bit Unsigned Integer
> Default: 8 << 20
> ------------
>
> I am confused. Can anyone let me know what is the value that I have to give
> to reduce this parameter ?
>
This is what you get when programmers write docs.
The above is a left-shift operation, see for example:
http://bit-calculator.com/bit-shift-calculator
Now if shrinking that value is beneficial for reducing recovery load,
that's for you to find out.
Christian
>
>
> Karun Josy
--
Christian Balzer Network/Systems Engineer
chibi@xxxxxxx Rakuten Communications
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