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" <wido@xxxxxxxx> > To: "Andrei Mikhailovsky" <andrei@xxxxxxxxxx>, "ceph-users" <ceph-users@xxxxxxx> > Sent: Tuesday, 2 February, 2021 07:44:13 > Subject: Re: 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 >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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