Can anyone answer this question: What happens if one drive is out of sync with the other. One drive has 1 month newer files on it, but its not the boot drive. If I let Centos boot from the older version will it automatically rebuilt the raid 1 to the second drive????? (bad for me) Or do you have to manually do it?? Thanks I am attempting to copy all the files from the newer drive to the other drive via a ide drive. Then it will boot with the newer files. Then I can sfdisk form the new to the other and make it bootable, then get ride of the bad drive. I am so confused. Peter Farrow wrote: > > Sorry I missed out the link in my original response, >>> you might find this article useful: > http://beau.org/pipermail/whitebox-users/2006-April/007467.html > > P. > > > Mace Eliason wrote: >> I just think this might work >> >> I am using scsi drives so would I use root (sd0) I tried it but it >> said error while parsing number >> >> I tried root (hd0) and it said filesystem type unknown, using whole disk >> >> I stopped at that point worried I might mess up the whole thing >> >> I have read other links that talk about doing it this way >> >> $ grub >> >> grub> device (hd0) /dev/hdc >> grub> root (hd0,0) >> Filesystem type is ext2fs, partition type 0xfd >> grub> setup (hd0) >> Checking if "/boot/grub/stage1" exists... no >> Checking if "/grub/stage1" exists... yes >> Checking if "/grub/stage2" exists... yes >> Checking if "/grub/e2fs_stage1_5" exists... yes >> Running "embed /grub/e2fs_stage1_5 (hd0)"... 15 sectors are embedded. >> succeeded >> Running "install /grub/stage1 (hd0) (hd0)1+15 p (hd0,0)/grub/stage2 >> /grub/grub.conf"... succeeded >> Done. >> >> do I need the device line first? >> >> Thanks >> >> >> >> >> >> >> Peter Farrow wrote: >>> You can replace the boot loader as follows: >>> >>> 1)Boot in REscue mode, and get a command prompt >>> 2)Run grub, if your two disks are for example /dev/hda and /dev/hdb >>> and the boot partition is the first on each: >>> grub> root (hd0) >>> .... >>> grub> setup (hd0,0) >>> ... >>> grub>root (hd1) >>> ... >>> grub>setup (hd1,0) >>> ... >>> grub>exit >>> >>> This will put a stage1 boot loader on each disk, you should be able >>> to boot the originally non-bootable disk now. Make sure you boot in >>> the bios from the second disk, (which I presume is the one you want >>> to keep), to make sure you could disconnect the original drive first >>> and boot the system to try it. >>> >>> You might find this article useful. >>> >>> If the first disk has now been fixed but contains no data, you can >>> export the partition table from the second disk using sfdisk, and >>> re-import it on the first hard disk using sfdisk again, you can then >>> use mdadm to hot add the first (replaced) disk to the second >>> (running and now bootable) disk. >>> >>> Regards >>> >>> Pete >>> >>> >>> >>> Mace Eliason wrote: >>>> Trying a different approch. >>>> >>>> Senario >>>> >>>> Raid 1 setup >>>> Bootable raid drive failed >>>> Mirror has been working for almost a month and then rebooted >>>> Now can't boot mirror drive grub not mirrored from other drive. >>>> >>>> I Fixed bootable drive. >>>> Question? >>>> >>>> Can I hook up both drives and boot fixed drive then rebuilt mirror >>>> from nonbootable drive to bootable drive? >>>> >>>> Does the raid automatically rebuilt when I boot with both drives? >>>> Can I run a command to rebuilt from one drive to the other and visa >>>> versa >>>> >>>> I want to try it but I am worried that if I hook them up and it >>>> boots that because the bootable drive has older info it might over >>>> write the other drive. >>>> Thanks >>>> >>>> Can't seem to figure out how to get the other drive bootable. >>>> _______________________________________________ >>>> CentOS mailing list >>>> CentOS at centos.org >>>> http://lists.centos.org/mailman/listinfo/centos >>>> >>> >>> _______________________________________________ >>> CentOS mailing list >>> CentOS at centos.org >>> http://lists.centos.org/mailman/listinfo/centos >>> >>> >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> http://lists.centos.org/mailman/listinfo/centos >> > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > >