Another problem has cropped up with the newly installed 20.04LTS release. The Ubuntu system backs up several other machines as well as itself, one of which runs Ubuntu 20.10, two Gentoo boxes and a Windows 10 machine. The Linux boxes all use rsync whereas the Windows box exports its disk to the backup machine which mounts it with Samba. Backups of the server and of its Windows client work fine.
So far the other Ubuntu system and one Gentoo box go into a strange failure mode. It is possble that the other may do so too but it hasn't had chance to do so yet. The failure goes as follows. First a backup, whether incremental or full doesn't matter, is started. I monitor its progress with lsof on each system to see what is being read and written. I also use "ls -larts" in active subdirectories of /var/lib/backuppc/pc/PCNAME/new to monitor what is being written and read. All goes well for a long time then activity apparently ceases, but only apparently. What is really happening is that the newly formed XferLOG.z grows enormously. Until it was killed just now, that file had reached 4180700817 bytes (3.9GiB) after 6 hours and then stopped growing. A typical log file might be 20MiB. Examination with BackupPC_zcat on the giant file shows the regular log lines for a long time but eventually turns into binary mush. The NewFileList file is also strange. It ends part way through a standard line as follows: 486f208a006a335645ec1839b9c001ac 189 f%2f/flib/ffirmware/fcxgb4/fconfigs/attrib bc6f59e44fdcdac6a4034b43f588bafe 449 f%2f/flib/ffirmware/fcxgb4/attrib 3f250cfd4201077c6e341454dd042d3c 766 f%2f/flib/ffi and is 24756 (i.e. 6 * 4096) bytes long. Anyone else seen similar behaviour and / or have an idea as to what may be going wrong? Thanks, Paul
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