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
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