Backup Exec 12 problem on Windows 2008
We've just replaced our aging Quantum LTO1 Valueloader with a bit more capacious Quantum LTO3 Superloader 3 - but performance under Backup Exec 12 on a Windows 2008 server seems, well, pants- to put not too fine a point on it! :D
With the old valueloader on the same server, we were seeing data transfer rates over 500Mb/min - but with the new Superloader 3, we're getting only 5Mb/min!
It starts off around the 600Mb/min mark, then plummets steadily and quickly in the first few minutes of the job until it bottoms out around 5Mb/min. A recent 800Mb test job (backing up the program files folder from the media server itself, to rule out any agent issues) took nearly 3 hours to complete!
Obviously this isn't great when trying to back up nearly a terabyte of data overnight - it just isn't going to happen. :mad:
I've checked and confirmed SCSI connections - it's on an Adaptec 29160LP adaptor: not the newest HBA, but it worked fine with the other one. Changed cables, changed terminators. Still the same.
We've even gone to the extremes of completely reinstalling the server to ensure any old drivers from the original Valueloader have been well and truly removed from the environment. No change.
We're using the Quantum driver for the autoloader mechanism, and the Symantec driver for the tape drive. Autoloader operations complete fine and in a timely manner suggesting the quantum driver is OK. We've updated the Symantec drivers using a hotfix from their website, and applied SP3 for Backup Exec 12, still no change.
We're using brand new Sony LTO3 media throughout.
Given Backup Exec will use a network folder as a target for backup, and record throuput in the region of 300Mb / min when it does so, we're comfortable that it's not an agent issue pulling files from machines, or that the software itself is rubbish.
It seems confined to this autoloader - which suggests SCSI, driver, or physical device issue. However we've been on to Quantum, who have inspected the device logs and had us run some test software against the device only to find no fault. Under the test software, it is returning the expected data transfer rates and they're insisting the device is working fine - it must be something else.
I think there can only be a config problem left - but I'm beating my head against a brick wall over what it could be as I've spent so long staring at it without success! Seeing woods for trees, and all that.
I can see that I'm going to have to buy in another SCSI HBA just so I can do some swap-out testing, or even upgrade to Backup Exec 12.5 to rule out 12, but I'd rather not spend precious wodges of my budgets if I can avoid it!
Thanks in advance!