Cool, thanks. These 2 cards have the most usage: 00:0d.0 SCSI storage controller: Adaptec AHA-2940U2/U2W 00:0e.0 SCSI storage controller: Adaptec AHA-2940U2/U2W 7 disks each. I will move 1 of my SCSI cards to test the other PCI slots. Maybe I can split them on to 2 different buses. Not that I need any more speed. :) Just want to learn what I can. The only time these SCSI cards are working hard is during a re-build of my monster 14 disk, 200Gig RAID5. Stop laughing! Thanks, Guy -----Original Message----- From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Neil Brown Sent: Friday, August 27, 2004 8:05 PM To: Guy Cc: linux-raid@xxxxxxxxxxxxxxx Subject: RE: Raid-0 speed On Friday August 27, bugzilla@xxxxxxxxxxxxxxxx wrote: > The PCI bus vs slot confuses me. > > My 32 bit, 33 Mhz cards can process 132 Mbytes/sec. > As I understand it, more than 1 PCI slot shares a single PCI bus. > How fast is the PCI bus? Only one card can be active on any one buss at any one time. However, a buss can (I believe) handle different speed cards and will adjust it's speed to match the features of the card. > > This is from "lspci": > 00:00.0 Host bridge: Intel Corp. 440BX/ZX/DX - 82443BX/ZX/DX Host bridge > (rev 03) > 00:01.0 PCI bridge: Intel Corp. 440BX/ZX/DX - 82443BX/ZX/DX AGP bridge (rev > 03) > 00:07.0 ISA bridge: Intel Corp. 82371AB/EB/MB PIIX4 ISA (rev 02) > 00:07.1 IDE interface: Intel Corp. 82371AB/EB/MB PIIX4 IDE (rev 01) > 00:07.2 USB Controller: Intel Corp. 82371AB/EB/MB PIIX4 USB (rev 01) > 00:07.3 Bridge: Intel Corp. 82371AB/EB/MB PIIX4 ACPI (rev 02) > 00:0d.0 SCSI storage controller: Adaptec AHA-2940U2/U2W > 00:0e.0 SCSI storage controller: Adaptec AHA-2940U2/U2W > 00:11.0 Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] > 00:13.0 PCI bridge: Digital Equipment Corporation DECchip 21152 (rev 03) > 01:00.0 VGA compatible controller: Texas Instruments TVP4020 [Permedia 2] > (rev 01) > 02:0a.0 SCSI storage controller: Adaptec AHA-2940U2/U2W / 7890/7891 > 02:0e.0 SCSI storage controller: Adaptec AIC-7880U (rev 01) > > Do I have 3 PCI buses? Yes. One with IDE/USB/scsi/ethernet and a couple of bridges One for the VGA controller (possibly AGP rather than PCI) One for two more SCSI controllers. NeilBrown - 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 - 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
