RBD: Max queue size

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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?
-- 
Have a nice day,
Timofey.
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