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Hi Alastair, both the xrootd servers' built-in adler32 checksum and /usr/bin/xrdadler32 calculated the checksum and then try to save the result into an extended attribute. So a simple way to test is to run /usr/bin/xrdadler32 command on the server (ceph-gw2.gridpp.rl.ac.uk) against file /atlas:scratchdisk/test/file35. Hopefully this will give you the same error and help you debug. regards, -- Wei Yang | [log in to unmask] | 650-926-3338 ________________________________ From: alastairdewhurst <[log in to unmask]> Sent: Wednesday, January 4, 2017 3:43 PM To: xrootd/xrootd Cc: Subscribed Subject: Re: [xrootd/xrootd] checksum not supported by libXrdCephXattr (#443) Hi Andy Sorry I had missed that piece of documentation. If I try adding: xrootd.chksum max 3 adler32 /usr/bin/xrdadler32 When I run a command I get: $ xrdcp --cksum adler32:print /tmp/vm21_site_bdii root://ceph-gw2.gridpp.rl.ac.uk:1094/atlas:scratchdisk/test/file35 [353.8kB/353.8kB][100%][==================================================][353.8kB/s] Run: [ERROR] Invalid response If instead I try: xrootd.chksum adler32 When I run a command I get: -bash-4.1$ xrdcp --debug 1 --cksum adler32:print /tmp/vm21_site_bdii root://ceph-gw2.gridpp.rl.ac.uk:1094/atlas:scratchdisk/test/file36 [353.8kB/353.8kB][100%][==================================================][70.77kB/s] Run: [ERROR] Server responded with an error: [3005] Unable to checksum atlas:scratchdisk/test/file36; no data available I have actually looked again at the xattr stored by Xrootd and it isn't actually writing a checksum to Ceph. The GridFTPplugin which is based on the same libradosstriper libaries is writing a checksum, which is what confused me. I have tried the xrdadler32 command on files with and without a checksum stored and I am still getting the same error: "Error accessing " Not sure what I should try next? Alastair - You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<https://github.com/xrootd/xrootd/issues/443#issuecomment-270520418>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AE9TA_Sxaqzo_FA7R0kxFD6eB5zoiHyeks5rPC68gaJpZM4LQAVm>. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/443#issuecomment-270526834 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1