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On Jun 2, 2020, at 02:30, 肖正刚 <<a href="mailto:guru.novice@gmail.com" class="">guru.novice@gmail.com</a>> wrote:<br class="">
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<div dir="ltr" class="">Hi all,
<div class="">we use TBF policy(details: <a href="https://jira.whamcloud.com/secure/attachment/14201/Lustre%20NRS%20TBF%20documentation%200.1.pdf" class="">
https://jira.whamcloud.com/secure/attachment/14201/Lustre%20NRS%20TBF%20documentation%200.1.pdf</a>) to limit rpcrate coming from clients; but I do not know how to mapping of rpcrate to bandwidth or iops.</div>
<div class="">For example:</div>
<div class="">if I set a client's rpcrate=10，how much bandwith or iops the client can get in theory?</div>
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<div>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.</div>
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<div>Cheers, Andreas</div>
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<div>Andreas Dilger</div>
<div>Principal Lustre Architect</div>
<div>Whamcloud</div>
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