Back at Storage Field Day 16 in Boston, Zerto presented their VM replication software. It’s a block level, continuous hypervisor based replication, using a journal to log I/O in a VCR-like fashion. This enables you to rewind to any point in time that’s covered in the journal, and recover your VMs to that exact state. Zerto’s plans are a bit grander than “just VM Replication” though… they aim to cover the complete IT Resiliency market.
Today I have been troubleshooting Avamar backups of an Exchange 2013 DAG (Database Availability Groups) setup. The Avamar job would start but no data would be backed up and the job would fail within 15 minutes. Initially VSS was suspected to be the culprit but additional troubleshooting revealed some strange behavior of the Avamar client in which the individual plugins would keep waiting for a status message that would never arrive.
The setup is simple: three Windows 2008 R2 SP1 servers, Exchange 2013 Update 5 with Database Availability Groups and Avamar 7.0.2 as the backup software and target. The error that pops up looks like this: