Hi Christian,
Thank you for your help.
Ceph version is 12.2.2. So is this value bad ? Do you have any suggestions ?
So to reduce the max chunk ,I assume I can choose something like
7 << 20 ,ie 7340032 ?
Karun Josy
On Tue, Feb 6, 2018 at 1:15 PM, Christian Balzer <ch...@gol.com> wrote:
> 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
> ch...@gol.com Rakuten Communications
>
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