Hello,
looks like something is wrong on CentOS master mirrors. I am admin of ftp.upjs.sk centos mirror. At 16th june started to repeatedly download/delete this temporary file. Looks like it's forgotten somewhere on master mirrors. Here are logs:
mirror-20200616.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200616.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200621.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200621.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200622.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200622.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200622.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200622.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200622.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200622.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200624.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200625.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200627.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200627.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200629.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB mirror-20200629.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB ... logs/mirror-20200717.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB logs/mirror-20200717-2259.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB logs/mirror-20200718.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB logs/mirror-20200718.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB logs/mirror-20200718.log.gz:8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB logs/mirror-20200718.log.gz:deleting 8.2.2004/isos/aarch64/.CentOS-8.2.2004-aarch64-dvd1.iso.X6d3IB
As you can see, this file is repeatedly downloaded and deleted always after some days. Temporary extension X6d3IB is always same. I use eu-msync.centos.org::CentOS as source for my mirror.
Please, fix this problem. Thank you.
Jan ONDREJ (SAL)