Regarding payloads, I've recently bought an EVGA motherboard off newegg for $120 and it supports upping the payload to 4096 bytes. Newegg link: http://www.newegg.com/Product/Product.aspx?Item=N82E16813188035 Manual guide: http://www.evga.com/support/manuals/files/113-YW-E115.pdf The motherboard above has 8 SATA ports, built-in VGA (256MB, if you care), 1x Gbit LAN, 4x RAM DIMMs and a few more options. I use it for my primary array: 8x1TB disks. ASUS gaming motherboards allow changing the payload as well. On Wed, Sep 16, 2009 at 4:28 AM, Doug Ledford <dledford@xxxxxxxxxx> wrote: > On Sep 15, 2009, at 9:01 PM, Majed B. wrote: >> >> I think someone mentioned in the mailing list that the Linux kernel >> does sort commands before sending them to the disks, so if the disk >> tries to sort, and its algorithm isn't that good, the performance >> drops and hence disabling them is a good idea. I believe it's also >> mentioned in here: http://linux-raid.osdl.org/index.php/Performance > > > It depends on the elevator in use. And regardless, I have yet to see a > raid5 array ever perform better with queueing turned off instead of on. > Although, in many cases, very large queue depths don't help much. Testing > I've done showed that only a 4 to 8 queue depth is sufficient to get 95% or > better of the performance benefit of queueing. > > -- > > Doug Ledford <dledford@xxxxxxxxxx> > > GPG KeyID: CFBFF194 > http://people.redhat.com/dledford > > InfiniBand Specific RPMS > http://people.redhat.com/dledford/Infiniband > > > > > -- 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
