[Lustre-discuss] RPCs in flight

Lee, Brett brett.lee at intel.com
Thu Jun 27 18:54:52 PDT 2013

Hi Patrick,

This setting reflects how much network IO, in the form of unacknowledged RPCs, a client can have sent (in flight) at any one time.

A setting of 8 would mean that the client can have 8 RPC's out to each OST.

It affects performance in that a client, which might otherwise be waiting for RPC replies, can keep sending and not block - helpful for large asynchronous IO.

Of course, if too many clients are sending too much and overwhelm the storage servers, then performance could be negatively impacted as well.

Brett Lee
Sr. Systems Engineer
Intel High Performance Data Division

From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Chan Ching Yu, Patrick
Sent: Thursday, June 27, 2013 4:57 PM
To: lustre-discuss at lists.lustre.org
Subject: [Lustre-discuss] RPCs in flight

Dear all,

Just raise a probably stupid question. I always see the word "RPCs in flight".

What does it mean? How does it affect the performance?

Thanks very much.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/attachments/20130628/696dc311/attachment.htm>

More information about the lustre-discuss mailing list