On Monday, February 13, 2006 7:02 AM, Mirko Benz wrote: > > Hello, > > We are testing the following setup: > - LSI SAS3442X controller > - Promise J300S SAS JBOD connected via the external port of the SAS > controller > - 10 SATA disks (Seagate) in the JBOD > - Linux kernel 2.6.16RC2 on a INTEL Dual Xeon Server, 2.8 > Ghz, 64 bit mode > > LSI SAS driver provided by the kernel finds the JBOD and the disks. How many links are connected between your controller and the JBOD? With that many drives, I suggest you connect four cables to create a wide port. There is a expander in your JBOD, right? Meaning its not a SATA port mulitplier? > Single disk performance is like attaching via a SATA > controller from the > chipset. Are your disks SATA-II, and do they support NCQ? If so, I suggest we enable that. That is can be done in the NVDATA. > Testing with multiple parallel drive accesses gives very poor results > and high system utilisation. > Tests performed with parallel invocations of dd with bs=32k. > Values in MB/s. > Which benchmarking tool are you using? - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
