john clyne wrote:
> Can anyone give me some guidance on where in the IO stack I might be running
> into a 512KB limit on IO transfer sizes to an external FC device? I've
> checked IO scheduler parameter
> (/sys/block/<dev>/queue/{max_sectors_kb,max_hw_sectors_kb}. Both are set to
> 32767. I'm using Qlogic HBAs (qla2312), but I don't see any relevent
> parameters. I'm running RHEL 4.0 with a 2.6.9-34 kernel. Any pointers would
> be greatly appreciated.John, I discuss the subject in this page: http://www.torque.net/sg/sg_io.html in the section titled: Maximum transfer size per command Mike C. has given you the answer for the block device interface (e.g. via /dev/sda); you should be able to do about 8 times better via the scsi generic interface (e.g. /dev/sg0). Doug Gilbert - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
