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About jaz

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  1. jaz

    Slow benchmark with 15k.3

    I have solved the problem. I want to thank everyone for their help, especially sdbardwick. Your suggestion was very close. It turns out that the SCSI terminator was not the correct one. It was not clearly labeled and it was forcing the SCSI bus to run in SE mode. After replacing the terminator, I'm now getting benchmark results close to what is expected. Thanks again.
  2. jaz

    Slow benchmark with 15k.3

    That's a good suggestion. I will try it. BTW, I installed Windows 2000 an re-ran all the benchmarks. There was no change. There is a possibility that my SCSI bus is somehow running in SE mode vs LVD. Is there a way to check this? Is there any diagnostic software which will tell you what mode the SCSI bus is running in?
  3. jaz

    Slow benchmark with 15k.3

    Regarding your question... Sisoft Sandra 2003: Drive Index = 28018 KB/s HD Tach 2.61: Read Burst Speed = 33.6 MB/s Read Speed Max = 33,627 KB/s Read Speed Min = 29,973 KB/s Read Speed Average = 33,583 KB/s Random Access Time = 5.8ms Adaptec SCSI Benchmark: Transfer size = 64KB Transfer type = Random I/O Throughput = 29,503 KB/s I have contacted Seagate tech support and they were not very helpful. In fact, the person I spoke with was rude. I think the people on this forum are more knowledgeable than Seagate's tech support.
  4. jaz

    Slow benchmark with 15k.3

    Yes, write caching is enabled.
  5. I've recently purchased two Seagate 36GB 15k.3 and ran the following benchmarks and got the following results. Sisoft Sandra 2003 = 28MB/s Adaptec SCSIBench (64K, Random) = 28MB/s HD Tach 2.61 = 33MB/s My setup is: WindowsXP Adaptec 29320 controller Seagate 36GB 15k.3 Intel D875PBZ motherboard Intel P4 3.0 GHz Both my 15k.3 jumpers are set to default (no jumper). I have assigned one drive to be ID=0 and the other to be ID=1. I have run the benchmarks on both drives with identical results so it's probably not the drives. I have swapped out the SCSI cable and there is no change. I have checked the Adaptec 29320 BIOS and there is nothing unusual. All 3 benchmarks report the degradation so it's probably not the benchmark program. I am well aware of the problem that some user report with WindowsXP and SCSI. According to Microsoft, the problem can occur if you're using SCSI, Windows XP, and NTFS format. I have tried formatting one of the drives as a FAT32 and rerun the benchmarks on them. No change. I have also repeated all benchmarks using Windows Server 2003 Standard Edition. No change. As of now, my very expensive SCSI setup is running at 50% of what it should be. My 15k.3 are performing more poorly than an cheap 80GB IDE drive that can be had for $100. If anyone has any ideas as to what to problem is, I would greatly appreciate it. I use this computer for SQL Server so disk I/O is very important to me. Thanks in advance.