On Tuesday 13 January 2004 21:20, Jimmy Rosen wrote: > I have some experience with the following: > 3ware > Promise > kernel SW raid > > Promise: > I once started with a promise 6000 card and after serious problems > with that card I decided to abandon that path. > Primarily the card is largely incompatible with the AMD 760 chipset > as far as I've been able to conclude. I use dual athlon MP for most > customer cluster nodes. > Secondarily the serious tech support, while _very_ eager to help are > situated in China and, believe it or not, are forbidden to access > certain useful websites e.g. the openmosix site. So while we had some > very interesting problems trying to smuggle kernel sources back and > forth through their bizzaro imposed cencorship I finally got too > tired of working with it. > > 3ware: > I've built a 4x120GB raid 5 to serve as main storage for a cluster I > built for a customer. It works very nicely. I'm disappointed with the > performance, only about 15MB/s. Anyone else got better results? It is
The problem most likely is the fact that it used normal PCI bus, which really is not even closely enough for even single disk access. Those 3ware cards are really fast and good when plugged to 64bit PCI-X bus working at 133 MHz speed, but to normal PCI there simply can't be a speedy PCI ide raid, because the PCI bus is too slow. PS. I has integrated ide raid which is half HW half SW from ITE. It works well and is quite speedy too. Under normal system load (mp3 listening etc) two ibm 120GB HD's as RAID 1 gives these results. Smaller result from the two consecutive runs. high-voltage /home/sami # hdparm -tT /dev/sda /dev/sda: Timing buffer-cache reads: 2712 MB in 2.00 seconds = 1356.00 MB/sec Timing buffered disk reads: 140 MB in 3.00 seconds = 43.56 MB/sec -- [EMAIL PROTECTED] mailing list
