Date: Sat, 29 Jul 1995 17:54:48 +0100 From: Gary Palmer <gary@palmer.demon.co.uk> To: Brad Midgley <junkmail@pht.com> Cc: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com>, hackers@freebsd.org Subject: Re: 2.0.5-950622-SNAP on a big machine Message-ID: <653.807036888@palmer.demon.co.uk> In-Reply-To: Your message of "Sat, 29 Jul 1995 10:01:38 MDT." <Pine.LNX.3.91.950729095306.12809A-100000@exodus.pht.com>
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In message <Pine.LNX.3.91.950729095306.12809A-100000@exodus.pht.com>, Brad Midg ley writes: >do scsi devices on a second controller just show up as [r]sd7-[r]sd13?? >(ie, same major device number, just incrementing the minor number?) How >does the machine decide which controller is first? The system just keeps adding SCSI devices from where it left off with the first controller, unless you hard wire down the device assignments in the kernel config file. So if sd0 through sd4 are used on the first controller, numbering will start at sd5 on the second. It's probably best to hardwire down your choices in the kernel config file, though, as you won't have to go through your /etc/fstab every time you change the chain on the first controller. David (Greenman) wired down the disks on ftp.cdrom.com for this very reason. He mapped the disks with what could be called octal notation - sd0 to sd7 on the first controller, sd10 to sd17 on the second and sd20 to sd27 on the third. I'm sure you get the idea - with this scheme, you can see at a glance which controller the disk is on... >where can I find documentation on /sbin/dset and the kernel -q option? -q? You mean -s? About the only docs I know of are in the Hardware Guide that is part of sysinstall, although there may be something in the Handbook. Gary
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