Date: Tue, 9 Feb 2010 13:22:53 -0600 From: Peter Steele <psteele@maxiscale.com> To: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: RE: How can I force boot from alternate drive with boot.config? Message-ID: <7B9397B189EB6E46A5EE7B4C8A4BB7CB3849F770@MBX03.exg5.exghost.com> In-Reply-To: <23F2E2B0457F4046AD8350DAFB86C41130D434E7@MBX03.exg5.exghost.com> References: <7B9397B189EB6E46A5EE7B4C8A4BB7CB383B2699@MBX03.exg5.exghost.com> <20100208175621.GA43054@zibbi.meraka.csir.co.za> <7B9397B189EB6E46A5EE7B4C8A4BB7CB383B2775@MBX03.exg5.exghost.com> <20100208193540.GA53234@zibbi.meraka.csir.co.za> <23F2E2B0457F4046AD8350DAFB86C41130D434E7@MBX03.exg5.exghost.com>
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>>> So, more precisely, if I wanted to boot from drive 1, I'd use this? >>>=20 >>> 1:ad(1p3)/boot/loader >> >>Yes, unless there are more bugs hiding. :-) I fixed a few in August last = year. > >Well, I'll give it a try and let you know if I find new bugs... :-) I just tried this and it works as advertised--thanks. One question though: = Why does this string list the device number twice? The man page describes i= t as bios_drive:interface(unit,[slice,]part)filename where bios_drive is the "drive number as recognized by the BIOS. 0 for the= first drive, 1 for the second drive, etc.", and unit is the "unit number = of the drive on the interface being used. 0 for the first drive, 1 for the = second drive, etc." This sounds like it's describing the same thing, but not exactly, but I've = always used the same value in both fields and it's always worked. Is there = a case where these values might be different? In the test I just did I boot= ed from the fourth drive of a four drive system using 3:ad(3p4)/boot/loader I know my hardware and knew ad10 mapped to the fourth drive and would be re= ferenced as drive 3 in this context. But how would I determine this generic= ally? For example, given something like /dev/adN, how do I know what number= I'd use for this drive in boot.config?
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