Date: Fri, 21 Oct 2016 17:21:50 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: Ian Smith <smithi@nimnet.asn.au>, "Patrick M. Hausen" <hausen@punkt.de> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: boot0cfg on does not set default selection on gmirror device Message-ID: <580A328E.4040504@quip.cz> In-Reply-To: <20161022010007.U6806@sola.nimnet.asn.au> References: <14FD5FE6-6277-4EBE-8EE9-630A735F8BEA@punkt.de> <20161022005837.G6806@sola.nimnet.asn.au> <20161022010007.U6806@sola.nimnet.asn.au>
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Ian Smith wrote on 2016/10/21 16:43: > On Fri, 21 Oct 2016 13:39:57 +0200, Patrick M. Hausen wrote: > > Hi, all, > > > > we are repeatedly bitten by the following misbehaviour of boot0cfg: > > > > root@hd45:/usr/local # boot0cfg -s 1 mirror/m0 > > root@hd45:/usr/local # boot0cfg -v mirror/m0 > > # flag start chs type end chs offset size > > 1 0x80 1: 0: 1 0xa5 1022:254:63 16065 16418430 > > 2 0x00 1023: 0: 1 0xa5 1020:254:63 16434495 16418430 > > 3 0x00 1021: 0: 1 0xa5 768:254:63 32852925 1920667140 > > > > version=1.0 drive=0x80 mask=0xf ticks=182 bell= (0x7) > > options=packet,update,nosetdrv > > default_selection=F2 (Slice 2) > > > > So, while it should have set the default to slice 1, it simply didn't. > > boot0cfg isn't mirror-aware as such and thinks it's using BIOS services > to write to a specific drive, and likely did write to one of the disks, > but it seems gmirror isn't updating both disks' MBRs - which might not > be too surprising. Does it work 'sometimes'? We are using gmirror for whole drives mirroring from the time when it was introduced. It was always working with MRB/BSD. gmirror label gm0 ada0 ada1 And then you can use fdisk + bsdlabel or gpart to create slices and partitions and set it bootable on /dev/mirror/gm0. I didn't tried it with FreeBSD 10.3, but it works with 8.x (we skipped 9.x and all 8.x boxes were upgraded to 10.2 then 10.3) Miroslav Lachmanhome | help
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