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So Patrick, the problem you reported is that in 4.6.1 xrdadler32 doesn’t trigger a server side checksum calculation when xrdadler32 reached to the redirector, and only trigger server side calculation when going directly to the data server? I am running 4.4.0 for production and I don’t see this issue. I recently run into a similar issue on a test cluster with 4.6.1 and Andy told me that adding “xrootd.chksum xrdadler32” to the redirector should address this issue. That seems to work but I will try it again. regards, -- Wei Yang | [log in to unmask] | 650-926-3338(O) On 8/16/17, 2:24 AM, "[log in to unmask] on behalf of Patrick McGuigan" <[log in to unmask] on behalf of [log in to unmask]> wrote: >Hi, > >I ran into an issue with xrdadler32 that may or may not be a bug. > > >My dataservers and redirector are running version xrootd 3.3.6 > >The dataservers are configured with the line: > >xrootd.chksum max 4 adler32 /usr/bin/xrdadler32 > >so that checksums are stored in the extended attributes of the native XFS file >system. This works fine. > > >Originally the redirector did not have a similar line but during debugging I added: >xrootd.chksum adler32 /usr/bin/xrdadler32 > > >I had to reinstall a client machine (an SRM host) based on the OSG software >stack. The installation brought in version 4.6.1 for xrootd-client, >xrootd-fuse, xrootd-libs, xrootd-client-libs. Specifically the packages are: ><package>-4.6.1-1.osg33.el6.x86_64 > > >After installation I ran into problems with code that uses xrdadler32 to >retrieve checksums from files that are normally mounted via xrootdfs. The code >that uses xrdadler32 exports an XROOTD_VMP so that calls are translated to >native xroot URL's. The problem was that the code was not retrieving the >checksum, but instead, calculating the checksum on the SRM host which required >the SRM host to read the entire file locally. > > >I tracked this back a little bit and discovered that if I used >/usr/bin/xrdadler32 with an xroot URL (with the redirector as host), then the >checksum would be performed without a checksum being stored on the dataservers >native file system using extended attributes. If the xroot URL used the correct >dataserver as the host, then the checksum was stored. > > >I downgraded the xrootd installation on the SRM host to version >xrootd-client-4.5.0-2.osg33.el6.x86_64 and everything seems to be working properly. > > >I am not sure if this is a bug, given the age of the dataserver installation, >but I was encouraged to report it. > >Regards, > >Patrick > >######################################################################## >Use REPLY-ALL to reply to list > >To unsubscribe from the XROOTD-L list, click the following link: >https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1