Thank you Mathieu for the input. I have seen IBM DS4800 SANs doing 600MB/s-700MB/s using a bunch of 148GB 15k RPM FC disks. though I haven't seen them being benchmarked for IOPS. I was reading an article from AnadTech yesterday that compared rotational media to SSDs and they ran some stress tests. In the end, they concluded that hardware RAID controllers were hampering the performance because they couldn't absorb the amount of requests coming at them from the SSDs. When they switched to software RAID (on Windows in their test), they got almost double the performance (RAID5, 8 disks). You can see the numbers here: http://it.anandtech.com/IT/showdoc.aspx?i=3532&p=9 If you're interested in the whole article, you can go to the link above and go back to the main page using the index. On sequential read, they achieved 1257 MB/s on a RAID 5 setup. Quite impressive for those with video streaming applications. On Wed, Nov 11, 2009 at 2:03 AM, Mathieu Chouquet-Stringer <mchouque@xxxxxxx> wrote: > majedb@xxxxxxxxx ("Majed B.") writes: >> Chris, >> >> Do you mind sharing the drive models & controllers you're using that >> give you 800 MB/s? > > At work we reviewed different kind of fusion-io products (namely ioDrive > and ioDrive-Duo, 80GB and 640GB) and I could easily get 700 MB/s with > more than 100k iops (benched using fio)... > > http://kb.fusionio.com/KB/a29/verifying-linux-system-performance.aspx > > Their results are consistent with what I saw... > > I didn't like the binary like driver though... > -- > Mathieu Chouquet-Stringer mchouque@xxxxxxx > The sun itself sees not till heaven clears. > -- William Shakespeare -- > -- Majed B. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
