I haven’t opened a support ticket about this because I’m not sure if it’s a DRI, G-Technology or Apple issue. I’m leaning toward Apple.
Here’s my setup at work:
2 x DroboPro connected via FW800 and daisy chained to one another
2 x G-Technology G-SPEED esPro (RAID-10) connected via mini-SAS to a PCIe card, which System Profiler sees as two SCSI LUNs
The other computers there that connect to this ad-hoc server setup are also MacPro’s, with everything running 10.6.5.
The G-SPEED can handle about 600MB/sec read/write in this config and I use the DroboPro’s for archival storage. However, if I initiate simultaneous transfer on both a DroboPro and the G-SPEED on the same system over the network, the speeds plummet by 10x or more. The weirder thing is, say I’m rendering a movie out in Final Cut Pro (using the G-SPEED as the project files location and export location) and it’s using about 80% of the CPU on an octo-core machine, if I then start to copy to/from a DroboPro on that same machine, the CPU activity will start to just drop out to basically nothing for a few seconds at a time constantly.
If however, one MacPro is editing off the G-SPEED and a different MacPro starts to copy to/from a DroboPro, there’s no issue.
Any ideas? I’m leaning toward this being an Apple/OS issue but thought I’d throw this out here for possible comments.