I have a new server connected with 8gb Fibre to a Dell TL2000 with an Lto5 drive(IBM LTO-5 Drive). For testing I am pulling directly from an ISCSI device that is using 3 NIC's in MPIO. I can successfully pull 230-250MBps from this Array.
However, The tape is only writing at between 50-60MBps. I can monitor the speed with the Fibre Channel utility. The queue length never exceeds 1. Also the Nic's never exceed 25% utilization and When I create a large copy form the array I can easily exceed 80% on all of them(when I am going at 250MBps)
CPU does not exceed 5% with 8 cores remaining parked and I still have 8gb of memory free.
So why can DPM not utilize the full bandwidth to feed the LTO5 drive? I need to feed the drive at over 200 so I can get into streaming mode and avoid shoeshinning the tape.
Thanks,
Nick