On Wed, 14 Aug 2013 10:27:18 -0700 ariel.work@xxxxxxxxxx wrote: > Doing 'my homework', to my read, this is what I think needs to be done. > Am I right? > > In general > > (1) Boot from a LiveCD > (2) stop the arrays > (3) make changes > > The details should look like this. > > 1st checking > > cat /proc/mdstat | grep ^md > md0 : active raid1 sda1[0] sdb1[1] > md1 : active raid1 sdb2[2] sda2[0] > md2 : active raid10 sdc1[0] sdf1[3] sde1[2] sdd1[1] > > > ??? QUESTION: Why does the 'md1' line refer to "[2]" & "[0]"? Why > is there no "[1]" instead of "[2]"? Is this a problem that needs > fixing? > > For > > mdadm --detail --scan > ARRAY /dev/md0 metadata=0.90 > UUID=xxx... > ARRAY /dev/md/Rescue:1 metadata=1.0 name=Rescue:1 > UUID=yyy... > ARRAY /dev/md2 metadata=1.2 name=server:md2 > UUID=zzz... > > I'd do this? > > mdadm --stop /dev/md0 > mdadm --stop /dev/md/Rescue:1 > mdadm --stop /dev/md2 > > mdadm --uuid=xxx... --update=super-minor --assemble /dev/md0 > /dev/sd[ab]1 > mdadm --uuid=yyy... --update=super-minor --assemble /dev/md1 > /dev/sd[ab]2 > mdadm --uuid=zzz... --update=super-minor --assemble /dev/md2 > /dev/sd[cdef]1 As the man page says, super-minor is only relevant for 0.90 metadata, and updating it is automatic for 2.6 and later. So this step is not needed. > > mdadm --stop /dev/md0 > mdadm --stop /dev/md1 > mdadm --stop /dev/md2 > > mdadm --uuid=xxx... --update=name --name=server1_boot > --homehost="<none>" --assemble /dev/md0 /dev/sd[ab]1 > mdadm --uuid=yyy... --update=name --name=server1_root > --homehost="<none>" --assemble /dev/md1 /dev/sd[ab]2 > mdadm --uuid=zzz... --update=name --name=server1_storage > --homehost="<none>" --assemble /dev/md2 /dev/sd[cdef]1 This should work and do what you expect, though "--assemble" needs to come first. And if you are explicitly listing the devices (/dev/sd[ab]1), then giving the uuid as well is fairly pointless (though it doesn't hurt). > > Then EDIT > > /etc/mdadm.conf > + HOMEHOST <ignore> > CREATE owner=root group=disk mode=0660 auto=yes > DEVICE /dev/disk/by-id/ata-[DISK1]-part2 > /dev/disk/by-id/[DISK2]-part2 > DEVICE /dev/disk/by-id/ata-[DISK1]-part1 > /dev/disk/by-id/[DISK2]-part1 > DEVICE /dev/disk/by-id/ata-[DISK3]-part1 > /dev/disk/by-id/ata-[DISK4]-part1 > /dev/disk/by-id/ata-[DISK5]-part1 > /dev/disk/by-id/ata-[DISK6]-part1 > - ARRAY /dev/md0 level=raid1 num-devices=2 metadata=0.90 > UUID=xxx... > - ARRAY /dev/md1 level=raid1 num-devices=2 metadata=1.00 > UUID=yyy... > - ARRAY /dev/md2 level=raid10 num-devices=4 metadata=1.02 > name=server:md2 UUID=zzz... > + ARRAY /dev/md0 level=raid1 num-devices=2 metadata=0.90 > name=server1_boot UUID=xxx... > + ARRAY /dev/md1 level=raid1 num-devices=2 metadata=1.00 > name=server1_boot UUID=yyy... > + ARRAY /dev/md2 level=raid10 num-devices=4 metadata=1.02 > name=server1_storage UUID=zzz... > > and finally, > > mkinitrd > reboot > > How's that look? Mostly good. NeilBrown > > Ariel > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
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