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RAID 1 and mkraid

hi,

i have slackware 10.1 (kernel 2.6.11) and see my raidtab.

Code:



raiddev /dev/md0

 raid-level 1

 nr-raid-disks 2

 nr-spare-disks 0

 persistent-superblock 1

 chunk-size 16

 device /dev/hda

  raid-disk 0

 device /dev/hdc

  raid-disk 1

when i do 'mkraid /dev/md0'

Code:



handling MD device /dev/md0

analyzing super-block

disk 0: /dev/hda, 156290904kB, raid superblock at 156290816kB

disk 1: /dev/hdc, 156290904kB, raid superblock at 156290816kB

mkraid: aborted.

(In addition to the above messages, see the syslog and /proc/mdstat as well

 for potential clues.)

can you help me ?

i want to mirorring the hda -> hdb

When i boot on my 2.4.29's kernel , the raid0 works fine...... and 2.6.11's kernel false :X

thank's

hello

/dev/hda is specified the whole disk,you should make partitions by fdisk

example:

And, I think mdadm-tools package are better than raid-tools package :)

mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/hda1 /dev/hdc1

then you can run:

lsraid -p -R > raidtab

to build raidtab config-file without edit it by manual

Code:



root@servcd:~# mdadm --create /dev/md0 --level=1 --raid-devices /dev/hda1 /dev/hdc1

mdadm: invalid number of raid devices: /dev/hda1

humpf ? :X

lsraid return this :

Code:



# This raidtab was generated by lsraid version 0.7.0.

# It was created from a query on the following devices:

#      /dev/hdc

#      /dev/hdc1

#      /dev/hdc2

#      /dev/hdc3

#      /dev/hdc4

#      /dev/hda

#      /dev/hda1

#      /dev/hda2

#      /dev/hda3

#      /dev/hda4



# md device [dev 9, 0] /dev/md0 queried offline

# Authoritative device is [dev 22, 0] /dev/hdc

raiddev /dev/md0

        raid-level              1

        nr-raid-disks          2

        nr-spare-disks          0

        persistent-superblock  1

        chunk-size              16



        device          /dev/hda

        raid-disk              0

        device          /dev/hdc

        raid-disk              1

mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/hd[ac]1

see the examples at the end of mdadm man page

Quote:

mdadm --create /dev/md0 --level=1 --raid-devices /dev/hda1 /dev/hdc1

so sorry!
that my mistake, :o

mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/hda1 /dev/hdc1

Code:

root@servcd:~# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/hd[ac]1

mdadm: /dev/hda1 appears to be part of a raid array:

    level=1 devices=2 ctime=Mon Mar  7 17:57:07 2005

Continue creating array? y

VERS = 9001

mdadm: ADD_NEW_DISK for /dev/hda1 failed: Device or resource busy

excuse for the man page but ... the problem continu....

please run : fdisk -l and paste result here.
I guess your partition /dev/hda1 is not correct.

if you make partitions by fdisk, you must reboot and take activity the new partition, to avoid reboot, you can run partprobe after fdisk.

what is the output for:
mdadm --query /dev/hda1
mdadm --query /dev/hdc1

'fdisk -l'

Code:

root@servcd:~# fdisk -l



Disk /dev/hda: 160.0 GB, 160041885696 bytes

255 heads, 63 sectors/track, 19457 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes



  Device Boot      Start        End      Blocks  Id  System

/dev/hda1              1        124      995998+  82  Linux swap

/dev/hda2  *        125        6203    48829567+  83  Linux

/dev/hda3            6204        9850    29294527+  83  Linux

/dev/hda4            9851      19457    77168227+  83  Linux



Disk /dev/hdc: 160.0 GB, 160041885696 bytes

255 heads, 63 sectors/track, 19457 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes



  Device Boot      Start        End      Blocks  Id  System

/dev/hdc1              1        124      995998+  82  Linux swap

/dev/hdc2  *        125        6203    48829567+  83  Linux

/dev/hdc3            6204        9850    29294527+  83  Linux

/dev/hdc4            9851      19457    77168227+  83  Linux

root@servcd:~#

Code:

root@servcd:~# mdadm --examine /dev/hda1

/dev/hda1:

          Magic : a92b4efc

        Version : 00.90.00

          UUID : 310b0c11:592d0950:3d02bd4c:2550acdf

  Creation Time : Mon Mar  7 18:02:02 2005

    Raid Level : raid1

    Device Size : 995904 (972.56 MiB 1019.81 MB)

  Raid Devices : 2

  Total Devices : 2

Preferred Minor : 0



    Update Time : Mon Mar  7 18:02:02 2005

          State : active

 Active Devices : 2

Working Devices : 2

 Failed Devices : 0

  Spare Devices : 0

      Checksum : 1a1f1375 - correct

        Events : 0.1





      Number  Major  Minor  RaidDevice State

this    0      3        1        0      active sync  /dev/hda1



  0    0      3        1        0      active sync  /dev/hda1

  1    1      22        1        1      active sync  /dev/hdc1

root@servcd:~#

and hdc

Code:

root@servcd:~# mdadm --examine /dev/hdc

/dev/hdc:

          Magic : a92b4efc

        Version : 00.90.00

          UUID : 9922d56e:56e2d303:c5fee9e9:e675ad7f

  Creation Time : Mon Mar  7 16:44:51 2005

    Raid Level : raid1

    Device Size : 156290816 (149.05 GiB 160.04 GB)

  Raid Devices : 2

  Total Devices : 2

Preferred Minor : 0



    Update Time : Mon Mar  7 16:45:15 2005

          State : active

 Active Devices : 2

Working Devices : 2

 Failed Devices : 0

  Spare Devices : 0

      Checksum : d34f8ce4 - correct

        Events : 0.2





      Number  Major  Minor  RaidDevice State

this    1      22        0        1      active sync  /dev/hdc



  0    0      3        0        0      active sync  /dev/hda

  1    1      22        0        1      active sync  /dev/hdc

root@servcd:~#

i'm use argument --examine because it say

Code:

root@servcd:~# mdadm --query /dev/hda1

/dev/hda1: is not an md array

/dev/hda1: device -1073744460 in 2 device undetected raid1 md0.  Use mdadm --examine for more detail.

root@servcd:~#

when i use --query argument.

do you have solution ?

another solution...?

From what I see, I would think your raid array is already set.
Any error at boot or in dmesg ?

'dmesg'

Code:



md: could not bd_claim hda.

md: error, md_import_device() returned -16

md: array md0 already initialised!

md: array md0 already initialised!

EXT3-fs: unable to read superblock

isofs_fill_super: bread failed, dev=md0, iso_blknum=16, block=32

md: array md0 already initialised!

md: array md0 already initialised!

md: md0 stopped.

What does ' cat /proc/mdstat ' say ?

'mdstat'

Code:

root@servcd:~# cat /proc/mdstat

Personalities : [linear] [raid0] [raid1] [raid5] [raid6] [raid10] [faulty]

unused devices: <none>

if in my raidtab config file , i change

Code:

raiddev /dev/md0

        raid-level              1

        nr-raid-disks          2

        nr-spare-disks          0

        chunk-size              32

        device          /dev/hda

        raid-disk              0

        device          /dev/hdc

        raid-disk              1

Code:

raiddev /dev/md0

        raid-level              1

        nr-raid-disks          2

        nr-spare-disks          0

        chunk-size              32

        device          /dev/hda1

        raid-disk              0

        device          /dev/hdc1

        raid-disk              1

and start mkraid....

Code:

root@servcd:~# mkraid /dev/md0

handling MD device /dev/md0

analyzing super-block

disk 0: /dev/hda1, 29294527kB, raid superblock at 29294400kB

/dev/hda1 is mounted

mkraid: aborted.

(In addition to the above messages, see the syslog and /proc/mdstat as well

 for potential clues.)

.............

Got a question...Why are you trying to raid your swap partitions?