On 30 Nov 2015 21:19, "Ilya Dryomov" <idryomov@xxxxxxxxx> wrote:
>
> On Mon, Nov 30, 2015 at 7:17 PM, Timofey Titovets <nefelim4ag@xxxxxxxxx> wrote:
> > Hi list,
> > Short:
> > i just want ask, why i can't do:
> > echo 129 > /sys/class/block/rbdX/queue/nr_requests
> >
> > i.e. why i can't set value greater then 128?
> > Why such a restriction?
> >
> > Long:
> > Usage example:
> > i have slow CEPH HDD based storage and i want it export by iSCSI proxy
> > machine for ESXi cluster
> >
> > If i have so low queue depth, i just worry to get a performance
> > problem because cluster can process request, but HV/VM can't send new
> > request if queue in full state
> >
> > Then i have two solutions make several RBD devices for exporting or
> > increase queue depth.
> >
> > What you think about it?
>
> Which kernel is that?
>
> Thanks,
>
> Ilya
4.2.5 on archlinux,
Thanks
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