‘The IO operation at logical block address was retried’ on Hyper-V 2012 R2 guest

I’ve recently been working a lot with Microsoft’s backup solution and part of the System Center 2012 R2 suite: Data protection Manager 2012 R2. I will likely post some architecture and hands-on experience posts in the very near future but for now I want to share an experience I had after I migrated my DPM […]

Ubuntu to CentOS rsync errors with chgrp Operation not permitted (1)

When running rsync to backup from a ZFS volume on my primary Ubuntu server to a backup server running Centos I was getting non-fatal errors like this: rsync: chgrp “/DISK2_BACKUP/mnt/share4/vmshare/” failed: Operation not permitted (1) My rsync commandlines have the following format: rsync -avr –delete –progress /DISK2/vmshare/ /mnt/share4/vmshare/ The key flag in that commandline is […]