Veeam – Backup Copy „Block is not initialized. Failed to download disk.“

Recently a customer reported an issue with a backup copy job. At this customer we implemented a new leased line with synchronous 1Gbit/s bandwidth from the main site to a secondary site. That gave us completely new possibilities regarding the backup of data and making it available. There is no need for a WAN Accelerator anymore, we can replicate VM’s with Veeam directly to the secondary site. And also backup copy jobs to this site go now A) directly and B) in a regular manner (what wasn’t possible before because of lack of bandwidth).

By the beginning of the last week, around the 30th of May, one backup copy job started to fail. This job contains all VM’s and should backup copy the data once a day to the secondary location. But one server, the main fileserver, failed with this error message:

Error: Block is not initialized. Failed to download disk. Reconnectable protocol device was closed. Failed to upload disk. Agent failed to process method {DataTransfer.SyncDisk}.

First i thought, ok, that can happen. No worries. After the second failure i did some checks and also opened a support case at Veeam support. If you don’t know how to collect log files for a Veeam support case, please have a look here.

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