Hi, Andreas Thanks for your reply. I am geting more clearer，now. Thanks
Andreas Dilger <[email protected]> 于2020年6月10日周三 上午11:00写道： > On Jun 2, 2020, at 02:30, 肖正刚 <[email protected]> wrote: > > > Hi all, > we use TBF policy(details: > https://jira.whamcloud.com/secure/attachment/14201/Lustre%20NRS%20TBF%20documentation%200.1.pdf) > to limit rpcrate coming from clients; but I do not know how to mapping of > rpcrate to bandwidth or iops. > For example: > if I set a client's rpcrate=10，how much bandwith or iops the client can > get in theory? > > > Currently, the TBF policies only deal with RPCs. For most systems today, > you are probably using 4MB RPC size (osc.*.max_pages_per_rpc=1024), so if > you set rpcrate=10 the clients will be able to get at most 40MB/s (assuming > applications do relatively linear IO). If applications have small random > IOPS then rpcrate=10 may get up to 256 4KB writes per RPC, or about 2560 > IOPS = 10MB/s. > > Cheers, Andreas > -- > Andreas Dilger > Principal Lustre Architect > Whamcloud > > > > > > >
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