Yes, if the IO500 is representing a use case where the file size or block count must be correct, then LSoM can’t be used. However, the IO500 can be changed by consensus and perhaps there is a reason to include a use case which fits LSoM?
If so, the IO500 could be changed to allow `lfs find` and it in-turn could be used to get LSoM info as Andreas pointed out in his comment of LU-9538: https://jira.whamcloud.com/browse/LU-9538?focusedCommentId=230392&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-230392 . -Cory -- From: lustre-devel <[email protected]> on behalf of Patrick Farrell <[email protected]> Date: Tuesday, July 17, 2018 at 11:50 PM To: John Bent <[email protected]> Cc: "[email protected]" <[email protected]>, "[email protected]" <[email protected]> Subject: Re: [lustre-devel] MDT test in rel2.11 Lazy SoM is not landed yet, and it won’t be improving benchmark scores - it’s never “known 100% correct”, so it can’t be used for actual POSIX ops - if a file size read out is used for a write offset, then you’ve got data corruption. So for now it’s strictly limited to tools that know about it (accessed via an ioctl) and can accept information that may be stale. The intended use case is scanning the FS for policy application. ________________________________ From: John Bent <[email protected]> Sent: Tuesday, July 17, 2018 10:55:24 PM To: Patrick Farrell Cc: Abe Asraoui; [email protected]; [email protected] Subject: Re: [lustre-devel] MDT test in rel2.11 I'm curious about how DOM improves IO500 scores. :) Also LSOM but I don't know actually whether that's in 2.11 or where. On Tue, Jul 17, 2018 at 11:33 PM, Patrick Farrell <[email protected]<mailto:[email protected]>> wrote: Abe, Any benchmarking would be highly dependent on hardware, both client and server. Is there a particular comparison (say, between versions) you’re interested in or something you’re concerned about? - Patrick ________________________________ From: lustre-devel <[email protected]<mailto:[email protected]>> on behalf of Abe Asraoui <[email protected]<mailto:[email protected]>> Sent: Tuesday, July 17, 2018 9:23:10 PM To: [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]>; Abe Asraoui Subject: [lustre-devel] MDT test in rel2.11 Hi All, Has anyone done any MDT testing under the latest rel2.11 and have benchmark data to share? Thanks, Abe _______________________________________________ lustre-devel mailing list [email protected]<mailto:[email protected]> http://lists.lustre.org/listinfo.cgi/lustre-devel-lustre.org _______________________________________________ lustre-devel mailing list [email protected]<mailto:[email protected]> http://lists.lustre.org/listinfo.cgi/lustre-devel-lustre.org
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