[CC list trimmed] On Thu, Apr 03, 2003 at 10:05:27AM -0800, Peter L. Ashford wrote: > > 4 of the raid HD's are connected to the Promise controller and the other > > raid HD is master on the second onboard IDE channel (udma2/ATA33) > > I've NEVER heard that the FastTrak runs fast (I have been told that they > run VERY slowly). The FastTrack cards are identical to the UltraDMA cards from promise - you can turn one into the other with a resistor and a firmware flash. > I've benchmarked RAW disk speeds with an Ultra-100 and > WD1200JB drives, and gotten 50MB/S from each disk, as opposed to your > 26MB/S (there should be almost no difference for the BB drives). Makes perfect sense - he's getting 50M/s to each channel, but it's split over two drives, so drive throughput is about halved. > Use one disk per channel > (Master only), and move the system disk onto one of the Promise cards. Absolutely correct - you should *never* run IDE RAID on a channel that has both a master and slave. When one disk on an IDE channel has an error, the whole channel is reset - this makes both disks inaccessible, and RAID5 now has two failed disks => you data is gone! *ALWAYS* use separate IDE channels. -- Ross Vandegrift ross@willow.seitz.com A Pope has a Water Cannon. It is a Water Cannon. He fires Holy-Water from it. It is a Holy-Water Cannon. He Blesses it. It is a Holy Holy-Water Cannon. He Blesses the Hell out of it. It is a Wholly Holy Holy-Water Cannon. He has it pierced. It is a Holey Wholly Holy Holy-Water Cannon. He makes it official. It is a Canon Holey Wholly Holy Holy-Water Cannon. Batman and Robin arrive. He shoots them. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
