PS - LSI havent publically released the SAS2 (non-raid) card as yet. They have just released the RAID version and will follow with the non-raid soon. Their chips are being used on some of the later server motherboards, so SAS2 is around but new. On Tue, Oct 13, 2009 at 4:13 PM, mark delfman <markdelfman@xxxxxxxxxxxxxx> wrote: > We dont use 10 ports, we use 8 ports > 36 port expander. The 8 ports > act as a single wide port. > > We are hitting a performance limit of circa 1.6 - 1.9GBsec regardless > of number of drives, so it max's at around 8 / 9 drives (with 15K). > RAID6 around 900MBsec i recall. We expect more with emerging > expanders. > > We were hoping to use DM MPIO to increase performance using multiple > cards and paths, but MPIO at best matches performance of a single > card, most likely pulls it down.... but this is a different topic i > guess. > > XFS in the past has often increased performance - not allows on simple > sequential writes, but FS's are a lot better at intelligently caching > data... so I am very keen to help in whatever way i can to resolve the > FS > MD performance problem. > > Thanks again.... Mark > > > On Tue, Oct 13, 2009 at 3:30 PM, Asdo <asdo@xxxxxxxxxxxxx> wrote: >> >>> On Tue, Oct 13, 2009 at 2:12 PM, mark delfman >>> <markdelfman@xxxxxxxxxxxxxx> wrote: >>> >>>> >>>> We upgrading mainly because of support for the emerging LSI SAS2 cards >>>> (which we are beta testing now) >>>> >> >> What is this LSI SAS2 card you have with 10+ ports? The only 10+ ports LSI >> card I see is the 84016E and it is a SAS1. >> >> You say the driver for such card is included in the vanilla kernel at >> 2.6.30? That would be very nice... I grepped the 2.6.31 kernel source for >> LSI cards but I can't find device strings such as 84016E ... >> >> Thank you >> > -- 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
