Hi, I have a new Dell precision 390 workstation to record images captured by a video camera through a National Instructment frame grabber. As we need really fast capture speed, we choose the best SCSI disk available at the time, and hope to achieve the best writing speed. However, the system was performing extremely poorly, only recording 9 frames per second. A test with .NET 2.0 Disk Benchmark II shows the problem: when use Windows (.NET) Disk Caching, the write speed of the hard disk dropped significantly with large block size. And at block size 2048, the speed is a ridiculous 12.257 Mb/Sec, which is the speed we got from our camera at the end (please see the screen shot below). I don’t understand why it is happening, I tried to add a normal SATA disk to the system, and the speed come out as 46mb/s at block size 2048, almost 4 times better than the SCSI.
I talked to Dell’s technical support for the last few days, we upgraded all the possible drivers and firmware but nothing changed. There was no error message from the Dell’s hardware diagnostic, in the end they gave up claiming that’s not their hardware problem and I am running out of options now. I would really appreciate anybody’s suggestion, just to give me a clue why is it happening and hopefully I can find a solution. Thank you very much indeed.
The system is a Dell 390 precision workstation, using Intel Core 2 Duo 2.4G processor, with 4.0 G DDR RAM. The hard disk is a 146GB(15000rpm) FUJITSU MAX3147RC SCSI Disk, without RAID.
I talked to Dell’s technical support for the last few days, we upgraded all the possible drivers and firmware but nothing changed. There was no error message from the Dell’s hardware diagnostic, in the end they gave up claiming that’s not their hardware problem and I am running out of options now. I would really appreciate anybody’s suggestion, just to give me a clue why is it happening and hopefully I can find a solution. Thank you very much indeed.
The system is a Dell 390 precision workstation, using Intel Core 2 Duo 2.4G processor, with 4.0 G DDR RAM. The hard disk is a 146GB(15000rpm) FUJITSU MAX3147RC SCSI Disk, without RAID.