Hot Diggety! Colby Morgan was rumored to have written: > The SCSI adapter is a 2940UW. It does run great with large files, so if we > had an adapter hardware bottleneck file size shouldn't make a difference. > We are running the v5.0.2183.1 of the Microsoft drivers. I also opened a > call with IBM, and they didn't make any recommendations to update the > adapter drivers.
How many drives per SCSI bus? We limit it to two for a 80 MB/sec SCSI bus because a single drive is capable of pushing up to about 30 MB/sec in compressed mode over the SCSI bus. As a side note - with a diskpool, we achieve about 70-80 GB/sec with our LTO-1 drives, so the fact you're getting 1/5 to 1/8 the performance does sound pretty terrible, indeed. Could it be cabling quality issues - ie, reflection on the bus causing excessive retries or other related SCSI errors? That's another place where performance could be killed. -Dan
