BackupExec 2012 Rev. 1798 64 Bit with Service Pack 3 running on Microsoft Windows Server 2008 R2 Standard, backing up a Windows 2008 file server and Active Directory domain controller, an Exchange 2010 server, a Windows 2008 terminal server, a Linux server, a VMware ESXi host, and itself to disk deduplication store and copied from there to LTO-5.
In this setup I'm experiencing huge speed differences with the copy jobs from disk to tape. For example, these are the last couple of tape jobs in the log:
- 0.3 GB/min (1 hour for 22 GB) from the backup server itself
- 0.7 GB/min (9 hours for 350 GB) from the Exchange server
- 1.2 GB/min (5.5 hours for 370 GB) from the ESXi server
- 3.3 GB/min (34 mins for 100 GB) from the backup server
- 1.6 GB/min (4 hours for 370 GB) from the ESXi server
- 0.6 GB/min (11 hours for 350 GB) from the Exchange server
- 2.8 GB/min (2.25 hours for 340 GB) from the ESXi server
There's no corresponding variation in any of the performance parameters on the backup server. (CPU load, RAM usage, disk activity)
What could be the reason for that kind of variations? How can I find out what's holding up the slow ones?
aTdHvAaNnKcSe,
Tilman