On Tue, 6 Feb 2018 13:27:22 +0530 Karun Josy wrote:
> 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 ?
>
More like 4MB to match things up nicely in the binary world.
Christian
> Karun Josy
>
> On Tue, Feb 6, 2018 at 1:15 PM, Christian Balzer <chibi@xxxxxxx> 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
> > chibi@xxxxxxx Rakuten Communications
> >
--
Christian Balzer Network/Systems Engineer
chibi@xxxxxxx Rakuten Communications
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