Odd performance observation for RAID0

2008-02-26 Thread Joe Landman
Hi folks: I posted this in linux-raid, though I thought it might interest the kernel folks due to the subsystems in question. No responses there. Executive summary version: building a RAID0 across 2 large hardware RAIDed disks results in buffered I/O performance that is similar to a single

Re: [Scst-devel] Integration of SCST in the mainstream Linux kernel

2008-01-31 Thread Joe Landman
Bart Van Assche wrote: I have ran some tests with Bonnie++, but found out that on a fast network like IB the filesystem used for the test has a really big impact on the test results. This is true of the file systems when physically directly connected to the unit as well. Some file systems ar

Re: [Scst-devel] Integration of SCST in the mainstream Linux kernel

2008-01-31 Thread Joe Landman
Vladislav Bolkhovitin wrote: Bart Van Assche wrote: [...] I can run disktest on the same setups I ran dd on. This will take some time however. Disktest was already referenced in the beginning of the performance comparison thread, but its results are not very interesting if we are going to