Date: Tue, 5 Feb 2002 02:57:31 -0600 From: "Mike Meyer" <mwm-dated-1013331451.0dad58@mired.org> To: Alan Eldridge <alane@geeksrus.net> Cc: questions@freebsd.org Subject: Re: ATA_STATIC_IDS Message-ID: <15455.40571.628684.410211@guru.mired.org> In-Reply-To: <20020205070406.GA93914@wwweasel.geeksrus.net> References: <91010086@toto.iv> <15455.32686.88737.631037@guru.mired.org> <20020205070406.GA93914@wwweasel.geeksrus.net>
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Alan Eldridge <alane@geeksrus.net> types: > On Tue, Feb 05, 2002 at 12:46:06AM -0600, Mike Meyer wrote: > >Alan Eldridge <alane@geeksrus.net> types: > >> E.g., with static ids I have my / on ad4s1a. If I don't enable ATA_STATIC_IDS, > >> when I go to reboot the system, do I get an unbootable system, or one that just > >> can't fsck or mount anything once it boots? (I'd guess the answer is "yes"...) > >The answer is "it depends". If ATA_STATIC_IDS is enabled, the drives > >are numbered so that 0 is the primary master, 1 is the primary slave, > >2 is the secondary master, 3 is the secondary slave, and so > >on. Hmmm. Just how many IDE controllers do you have, anyway? > Bottom line seems to be that disabling ATA_STATIC_IDS is a Bad Idea most > of the time, from what you said (elided). Swapping on /usr? The horror ... > > So let me ask this: why would you want to use dynamic ids? With vinum, > perhaps? You only get into problems if you change the disk configuration. If you're not going to do that, wouldn't you prefer having ad0 and ad1 to having ad4 and ad6? The case I mentioned wasn't FreeBSD, and was caused by adding a controller, which the OS gave the next available number to, and the disks on it were numbered appropriately. Then the OS was upgraded, and the controllers were renumbered to the "natural" order, which caused the problems. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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