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@centos.org http://lists.centos.org/mailman/listinfo/centos
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