[SOLVED] Fstab

domz · 05-05-2011, 01:10 AM

I made a software RAID 0. It works fine, but when I add it to fstab and reboot the server, I can't restart the server.

Code:

# cat /etc/fstab
LABEL=/                 /                       ext3    defaults        1 1
LABEL=/boot             /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
LABEL=SWAP-sda5         swap                    swap    defaults        0 0
/dev/md0                /vz                     ext3    defaults        0 0

When I go to rescue mode and delete /dev/md0 from fstab, I can restart, but I get this when I try to mount it again:

Code:

mount: you must specify the filesystem type

So I try to make it to a ext3

Code:

# mkfs.ext3 /dev/md0
mke2fs 1.39 (29-May-2006)
mkfs.ext3: Device size reported to be zero.  Invalid partition specified, or
        partition table wasn't reread after running fdisk, due to
        a modified partition being busy and in use.  You may need to reboot
        to re-read your partition table.
#fdisk /dev/md0

Unable to read /dev/md0

I don't know what to do?

acid_kewpie · 05-05-2011, 01:42 AM

Well start by taking the mke2fs error message seriously. What is md0 made of? "mdadm --detail /dev/md0" will show what it thinks it's comprised of.

domz · 05-05-2011, 06:12 AM

I get this:

Quote:

mdadm --detail /dev/md0
mdadm: md device /dev/md0 does not appear to be active.

*note: This is after a reboot and deletion of /dev/md0 /vz ext3 defaults 0 0 from fstab.

Code:

#fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2   *          14        2703    21600666   83  Linux
Partition 2 does not end on cylinder boundary.
/dev/sda3            2703      119301   936580194   83  Linux
/dev/sda4          119302      121601    18474750    5  Extended
/dev/sda5          119302      121601    18474718+  82  Linux swap / Solaris

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1      121601   976760001   83  Linux

Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1      121601   976760001   83  Linux

Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1          121601      121601        8032+  83  Linux

mdadm --detail /dev/md0 suppose to equal /dev/sda3, /dev/sdb1, /dev/sdc1, /dev/sdd1

domz · 05-05-2011, 06:37 AM

It seemed that Raid stop working after reboot. So I recreated it:

Code:

# mdadm --create /dev/md0 --chunk=4 --level=0 --raid-devices=4 /dev/sda3 /dev/sdb1 /dev/sdc1 /dev/sdd1
mdadm: /dev/sda3 appears to contain an ext2fs file system
    size=-1404859392K  mtime=Thu May  5 15:38:17 2011
mdadm: /dev/sda3 appears to be part of a raid array:
    level=raid0 devices=4 ctime=Thu May  5 07:13:38 2011
mdadm: /dev/sdb1 appears to be part of a raid array:
    level=raid0 devices=4 ctime=Thu May  5 07:13:38 2011
mdadm: /dev/sdc1 appears to be part of a raid array:
    level=raid0 devices=4 ctime=Thu May  5 07:13:38 2011
mdadm: /dev/sdd1 appears to be part of a raid array:
    level=raid0 devices=4 ctime=Thu May  5 07:13:38 2011
Continue creating array? yes
mdadm: array /dev/md0 started.

and made it ext3

Code:

# mkfs.ext3 /dev/md0
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
361267200 inodes, 722526976 blocks
36126348 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
22050 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848, 512000000, 550731776, 644972544

Writing inode tables: 10728/22050

But when I restart, it will not work anymore.

domz · 05-05-2011, 07:31 AM

Problem solved!

Quote:

mdadm --examine --scan > /etc/mdadm.conf

and added it to fstab again!