Re: raid mdadm

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"

Dennis

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