Inconsistent Backup Speeds
Posted on 2011-02-27
I have a really strange issue that I have been trying to track down. I have a Windows 2008R2 server that is taking over 2 days to backup 3TB of data. Last week it backed up the data in less than 12 hours over a single gigE connection. This week it's taking more than 2 days to backup the same data.
The server is currently in VMWare 3.5. The data is stored on an EVA 4400 SAN and the ESX hosts connect to the SAN via 4GB Fibre.
Transferring data to from the SAN from clients is ever an issue. I have both Macs and Windows clients. The Macs typically use 1-2GB Photoshop files. I never have a complaint for speed.
I complain for the backup speeds. The procedure I use for the backups is staging the data to disk and them backup to tape for off-site storage.
I have a 7TB disk staging area and an HP MSL 6030 LT03 library that is attached to a Windows 2008R2 server.
This week, the backup speeds have dropped to under 700MB/m verses over 4500MB/m in previous weeks.
Looking at my VMWare logs, there is not his ultilization of resources and my Cisco switches are being taxed at all.
I am ata loos for ideas.
Anyone have any input to help me track down the cause?
02/21/2011 12:52:59 PM 170 Total Nodes to be backed up............ 1
02/21/2011 12:52:59 PM 170 Average Throughput: 4,711.52 MB/min
02/21/2011 12:52:59 PM 170 Elapsed Time: 11h 42m 20s
02/21/2011 12:52:59 PM 170 3,097,653.18 MB Written to Media.