raid mdadm

[xinyou yan]

2010/12/22 Dennis Gilmore <dennis at ausil.us>:
> 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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