On Wed 18 Jan 2006 19:01, Mike Bird wrote: > On Wed, 2006-01-18 at 13:50, José Pablo Ezequiel Fernández wrote: > > I have a software RAID that has wrong persistent superblock information, > > when I try to boot it tries to assemble the array with hdc1 and hdd1, but > > the array really is sda1 and sdb1. > > I am able to mount with a live CD and assemble the RAID by hand (using > > sda1 and sdb1). > > How can I update the superblock to hold that new information ? > > Thank you. > > You can "mdadm --stop ..." the RAID and then "mdadm --create ..." > the RAID again with the new info. > > To be safe, make backups first. However, I've done it a few > times without lossage.
There's no info yet, I am just trying to make this beast work for the first time. The superblocks are updated, starting with linux 2.4 and changing the config file /etc/mdadm/mdadm.conf to reflect the devices as seen from linux 2.6 (hdc -> sda, hdd -> sdb) updated the superblocks upon stop (when halting the computer). Now, when I try to boot up linux 2.6 I still get the same error: wrong superblock or /dev/hdc1: no such file or directory. Of course, it in now /dev/sda1, what/who is looking for it on /dev/hdc instead of /dev/sda ? I suppose something on grub or the like. When I boot linux 2.4, I get the first device, md0 mounted correctly from /dev/hdc1 and /dev/hdd1 (it is evidently not reading the superblocks for this) but for the rest of the partitions, it reads the superblock and fails to boot (of course, /dev/sd[ab] doesn't oxist on linux 2.4). Any idea what is wrong and how to fix it ? Thank you. -- José Pablo Ezequiel Fernández
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