On 30 Nov 2015 21:19, "Ilya Dryomov" <idryo...@gmail.com> wrote: > > On Mon, Nov 30, 2015 at 7:17 PM, Timofey Titovets <nefelim...@gmail.com> 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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