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256k requests size comes from looking at the lustre file system internal monitoring as seen at the lustre file servers.

When the code uses the lustre client directly, the requests to the lustre file servers are much larger.

Both Minio and Xrootd are using smaller request sizes to Lustre backend.



-----Original Message-----
From: "Yang, Wei" <[log in to unmask]>
Date: Monday, March 21, 2022 at 10:50 AM
To: Doug Benjamin <[log in to unmask]>, xrootd-l <[log in to unmask]>
Cc: "[log in to unmask]" <[log in to unmask]>
Subject: Re: how do I increase request size for xrootd

    Hi Doug,

    " Config asynchronous I/O has been disabled!" is expected, as you don't need async IO in LAN with a direct access to storage. Async is useful in WAN and proxy environment.

    What is "request sizes of 256k" referring to?

    ​--
    Wei​

    ________________________________________
    From: Doug Benjamin <[log in to unmask]>
    Sent: Monday, March 21, 2022 8:34 AM
    To: xrootd-l
    Cc: Hanushevsky, Andrew B.; Yang, Wei
    Subject: how do I increase request size for xrootd

    Hello,

      I am using several xrootd servers as front ends to distributed Lustre filesystem. The 3 servers get data from Lustre client via mounted Lustre FS.

    Right now we are seeing request sizes of 256k. Would like to increase it to 1M if possible. Most of the access is read only but we do have a read/write use case.

    Also the xrootd data server when it started up I saw this line in the xrootd log -

    " Config asynchronous I/O has been disabled!"


    Here is my configuration file -

    all.sitename sPHENIX
    xrd.port 1094
    all.export /sphenix/lustre01/sphnxpro
    all.role server
    all.role manager if xrdsphenix01.rcf.bnl.gov xrdsphenix02.rcf.bnl.gov
    all.manager xrdsphenix01.rcf.bnl.gov:1213
    all.manager xrdsphenix02.rcf.bnl.gov:1213
    cms.allow host xrdsphenix01.rcf.bnl.gov
    cms.allow host xrdsphenix02.rcf.bnl.gov
    cms.allow host dcsphdoor01.rcf.bnl.gov
    cms.allow host dcsphdoor02.rcf.bnl.gov
    cms.allow host sphnxrootd01.sdcc.bnl.gov
    xrootd.seclib libXrdSec.so
    sec.protocol sss -s /etc/xrootd/sss.keytab_sphenix.grp
    ofs.authorize
    acc.audit deny
    acc.authdb /etc/xrootd/auth_file.sphenix
    acc.authrefresh 60
    ofs.authorize 1
    xrd.network keepalive kaparms 10m,1m,5
    xrd.timeout idle 60m
    xrootd.trace request response
    http.trace   request response

    Thank you in advance.

    Regards,
    Doug Benjamin



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