Re: raid mdadm

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On Tuesday, December 21, 2010 11:49:05 pm xinyou yan wrote:
> 2010/12/22 Dennis Gilmore <dennis@xxxxxxxx>:
> > On Tuesday, December 21, 2010 11:30:16 pm xinyou yan wrote:
> >> First I add sdb sdc sde  fdisk to sdb1 sdc1 sdd1 sde1
> >> then
> >> # mdadm --create --level=5 --raid-devices=4 /dev/sd{b,c,d,e}1
> >> #mkdir /mnt/raid
> >> #mkfs.ext4 /dev/md0
> >> #vi /etc/fstab
> >> 
> >> add   /dev/md0  /mnt/raid  ext4 defaults 1 2
> >> 
> >> after reboot
> >> 
> >> fsck.ext4: Invalid argument while trying to open 0
> >> /dev/md0:
> >> The superblock could not be read or does not describe a correct ext2
> >> filesystem.  If the device is valid and it really contains an ext2
> >> filesystem (and not swap or ufs or something else), then the superblock
> >> is corrupt, and you might try running e2fsck with an alternate
> >> superblock: e2fsck -b 8193
> >> * Fsck could not correct all errors, manual repair needed
> 
> .....
> 
> > you need to setup /etc/mdadm.conf
> > you want a line like bellow
> 
> Now i can't write the file
> What i can see  (Repair filesystem) #
> 
> the  /etc/mdadm.conf is read only
> 
> > ARRAY /dev/md0 level=raid5 num-devices=4 uuid=<uuid of your array>
> > 
> > to get your uuid run "mdadm --examine /dev/sdc1 |grep UUID"
> > 

you need to remount / as rw

mount -o remount,rw /
then it will be writable

Dennis

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