Date: Fri, 14 Jan 2005 13:43:03 -0600 From: Doug Poland <doug@polands.org> To: Christian Hiris <4711@chello.at> Cc: freebsd-questions@freebsd.org Subject: Re: gmirror problem on 5.3-R i386 (SOLVED) Message-ID: <20050114194303.GB61113@omniresources.com> In-Reply-To: <200501130951.17307.4711@chello.at> References: <20050113025339.GC1218@polands.org> <200501130951.17307.4711@chello.at>
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On Thu, Jan 13, 2005 at 09:51:03AM +0100, Christian Hiris wrote: > Hash: SHA1 > On Thursday 13 January 2005 03:54, Doug Poland wrote: > > > > I'm having a problem with gmirror. It would seem that I cannot add my > > first disk to the mirror after booting off the second drive. My current > > status is a degraded mirror and I cannot see any of the partitions on > > disk one. > > > > # dd if=/dev/zero of=/dev/ad4 bs=512 count=79 > > You probably destroyed your slice table here. The dd command only makes sense > if you insert whole disks (ie. /dev/ad4 and /dev/ad6) as providers. Otherwise > you need to create (or already have) a valid slice table on the disk, which > enables gmirror to locate and insert your slice. > One of my problems was incorrect partition sizes when I created the bsdlabel for /dev/mirror/gm0s1. I didn't really know what I was doing nor did I understand the consequences of my actions ;) > (!) Before you start to correct your gmirror setup, please read all of my > comments, because to me it looks like you run a mirror of ad6 and not ad6s1. > I'm not sure why gmirror label shows that but it's definately misleading. Since this is a brand-new box with nothing but a minimal install, I decided to re-install 5.3-R. This time I got the install right and gmirror reads: Geom name: gm0s1 State: COMPLETE Components: 2 Balance: round-robin Slice: 4096 Flags: NONE SyncID: 1 ID: 3524221455 Providers: 1. Name: mirror/gm0s1 Mediasize: 80026329088 (75G) Sectorsize: 512 Mode: r5w5e1 Consumers: 1. Name: ad4 Mediasize: 80026361856 (75G) Sectorsize: 512 Mode: r5w5e2 State: ACTIVE Priority: 0 Flags: DIRTY SyncID: 1 ID: 2031344187 2. Name: ad6 Mediasize: 80026361856 (75G) Sectorsize: 512 Mode: r5w5e2 State: ACTIVE Priority: 0 Flags: DIRTY SyncID: 1 ID: 3116345061 Geom name: gm0s1.sync I'm going to include the steps I took, with one deviation from the published doc I referenced, and ask a couple more questions. 1 dd if=/dev/zero of=/dev/ad6 bs=512 count=79 2 fdisk -v -B -I /dev/ad6 3 4 gmirror label -v -n -b round-robin gm0s1 /dev/ad6s1 5 gmirror load 6 7 bsdlabel -w -B /dev/mirror/gm0s1 8 bsdlabel -e /dev/mirror/gm0s1 9 10 newfs -U /dev/mirror/gm0s1a 11 mount /dev/mirror/gm0s1a /mnt 12 dump -L -0 -f- / | ( cd /mnt ; restore -r -v -f- ) 13 newfs -U /dev/mirror/gm0s1d 14 mount /dev/mirror/gm0s1d /mnt/var 15 dump -L -0 -f- /var | ( cd /mnt/var ; restore -r -v -f- ) 16 newfs -U /dev/mirror/gm0s1e 17 mount /dev/mirror/gm0s1e /mnt/tmp 18 dump -L -0 -f- /tmp | ( cd /mnt/tmp ; restore -r -v -f- ) 19 newfs -U /dev/mirror/gm0s1f 20 mount /dev/mirror/gm0s1f /mnt/usr 21 dump -L -0 -f- /usr | ( cd /mnt/usr ; restore -r -v -f- ) 22 23 cp -p /mnt/etc/fstab /mnt/etc/fstab.orig 24 sed -e 's/dev\/ad4s1/dev\/mirror\/gm0s1/g' < /mnt/etc/fstab.orig > /mnt/etc/fstab 25 echo 'swapoff="YES"' >> /mnt/etc/rc.conf 26 echo 'geom_mirror_load="YES"' >> /mnt/boot/loader.conf 27 echo "1:ad(6,a)/boot/loader" > /boot.config 28 29 shutdown -r now 30 31 dd if=/dev/zero of=/dev/ad4 bs=512 count=79 32 fdisk -v -B -I /dev/ad4 33 gmirror configure -a gm0s1 34 gmirror insert gm0s1 /dev/ad4s1 35 sh -c 'while [ ".`gmirror list | grep SYNCHRONIZING`" != . ]; do sleep 1; done' 36 37 shutdown -r now On line 32, I deviated from the instructions on: http://people.freebsd.org/~rse/mirror/ The published command was: size=`fdisk ad6 | grep ', size ' | head -1 | sed -e 's;^.*size \([0-9]*\).*$;\1;'` (echo "p 1 165 63 $size"; echo "a 1") | fdisk -v -B -f- -i /dev/ad4 That command returned: "improperly placed quotes ()". I set the value of $size manually but it was some small number like 50000. I wrote it to ad4 but the command on line 33 puked. So I simply issued the command shown on line 32. Question: On line 27 we issue the command to... # instruct boot stage 2 loader on first disk to boot # with the boot stage 3 loader from the second disk # (mainly because BIOS might not allow easy booting from second ATA disk # or at least requires manual intervention on the console) So how do I get rid of that boot.config file? Should I get rid of it? Question: On line 25 we set swapoff=YES. Is this necessary if I'm going to run 5-STABLE? What are the implications of having swap on a mirror like this? Thanks for your help! -- Regards, Doug
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