EDIT UPDATE: for others seeing this thread. For me the issue was the scsi card itself for some reason. I replaced the Adaptec with an LSI and it works great now
Regardless of if I'm backing up the local server or a "disk-disk-tape" the speed writing to the tape drive is only around 350-500MB/min (not sec...min).
That's painfully slow.
IBM x3630 server - 12GB RAM, Windows 2008 R2
Here are the specs on the controller and drives:
• 46M0916 (M5014 controller) supports up to 6 Gbps of performance throughput for each port at full duplex • 44W2234 (IBM 300GB 15K 6 Gbps SAS 3.5-inch Hot-Swap HDD) supports: o Drive to host SAS interface that supports up to 6 Gb/s burst rate o Drive media to buffer interface that supports sustained interface data transfers of up to 204 MB/s • 42D0767 2 TB 7.2K rpm 6 Gbps NL SAS 3.5-inch HS HDD) supports: o Drive to host interface that supports up to 6.0 Gb/s burst rate o Drive media to buffer interface that supports sustained interface data transfers of up to 150 MB/s average
SCSI Controller = Adaptec 29320LPE U320
Tape Drive = HP Ultrium LT04 drive SCSI inside Overland Storage Arcvault 12
Things I've done so far:
- Updated the firmware
- Worked with BackupExec support to increase buffers, etc.
- Ran the HP Tape Tool software (results showed that the tape might be operating at u160 speed, and performance tests showed write speed around 9MB/sec
So, I'm at a loss. All of the hardware is decent and compatible. I'd love to just rip and replace but I'm also wanting to figure this out.
EDIT: also getting these errors on the HP Tape Tools:
The drive is experiencing polling (1.0 / sec. polling rate) on initiator ID 7. Polling can interrupt the normal operation of the drive, and significantly reduce performance.
Don't know what that means though.