cfq and now bfq are the only IO schedulers that implement fair share
across processes, and also they are the only schedulers that implement
io priorities (e.g. ionice).
We run this script via rc.local on all our ceph clusters:
https://gist.github.com/dvanders/968d5862f227e0dd988eb5db8fbba203
-- dan
On Tue, Feb 2, 2021 at 11:08 AM Andrei Mikhailovsky <and...@arhont.com> wrote:
>
> Thanks for your reply, Wido.
>
> Isn't CFQ being deprecated in the latest kernel versions? From what I've read
> in the Ubuntu support pages, the cfq, deadline and noop are no longer
> supported since 2019 / kernel version 5.3 and later. There are, however, the
> following schedulers: bfq, kyber, mq-deadline and none. Could someone please
> suggest which of these new schedulers does ceph team recommend using for HDD
> drives and SSD drives? We have both drive types in use.
>
> Many thanks
>
> Andrei
>
> ----- Original Message -----
> > From: "Wido den Hollander" <w...@42on.com>
> > To: "Andrei Mikhailovsky" <and...@arhont.com>, "ceph-users"
> > <ceph-users@ceph.io>
> > Sent: Tuesday, 2 February, 2021 07:44:13
> > Subject: Re: [ceph-users] osd recommended scheduler
>
> > On 28/01/2021 18:09, Andrei Mikhailovsky wrote:
> >>
> >> Hello everyone,
> >>
> >> Could some one please let me know what is the recommended modern kernel
> >> disk
> >> scheduler that should be used for SSD and HDD osds? The information in the
> >> manuals is pretty dated and refer to the schedulers which have been
> >> deprecated
> >> from the recent kernels.
> >>
> >
> > Afaik noop is usually the one use for Flash devices.
> >
> > CFQ is used on HDDs most of the time as it allows for better scheduling/QoS.
> >
> > Wido
> >
> >> Thanks
> >>
> >> Andrei
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