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Hello everyone,
Is there anyone having experience to try to tune Kernel RBD device by changing scheduler and other settings? Currently we are trying it on RHEL 7.1 bundled rbd module, to change the following setting under /sys/block/rbdX/queue: 1) scheduler: noop vs deadline, deadline seems better 2) nr_requests: default 128, tried 64 & 256 & 1024, and no clear difference between different value 3) rotational: as a network based device, should set to 0 for rbd? Tried and no clear difference between different value 4) read_ahead_kb: default 128, tried 4096 will be much better but also seen many extra network bandwidth used Now trying to have a plan to measure performance change on iops, throughput and side-effect in a quantitative way, and would like to know if anyone can share experience if there is already some optimal setting and if any other parameter I should try, like the tunable parameters tuning able for deadline. Thanks in advance, This electronic message contains information from Mycom which may be privileged or confidential. The information is intended to be for the use of the individual(s) or entity named above. If you are not the intended recipient, be aware that any disclosure, copying, distribution or any other use of the contents of this information is prohibited. If you have received this electronic message in error, please notify us by post or telephone (to the numbers or correspondence address above) or by email (at the email address above) immediately. |
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