Re: Bootable Raid-1

[Naira Kaieski <naira@faccat.br>]

Hi,

My metadata is 0.90...

My Partitions:
/dev/sda1               1         122      979933+  fd  Linux raid 
autodetect
/dev/sda2   *         123         134       96390   fd  Linux raid 
autodetect
/dev/sda3             135       19457   155211997+  fd  Linux raid 
autodetect

Disk /dev/md1: 1003 MB, 1003356160 bytes
2 heads, 4 sectors/track, 244960 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/md1 doesn't contain a valid partition table

Disk /dev/md2: 98 MB, 98631680 bytes
2 heads, 4 sectors/track, 24080 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/md2 doesn't contain a valid partition table

Disk /dev/md3: 158.9 GB, 158936989696 bytes
2 heads, 4 sectors/track, 38802976 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc4036374

Disk /dev/md3 doesn't contain a valid partition table


I created the array with the command:
mdadm --create --verbose --assume-clean --metadata=0.90 /dev/md3 
--level=1 --raid-devices=2 /dev/sda3 missing

# cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sda3[0]
       155211904 blocks [2/1] [U_]

md2 : active raid1 sda2[0]
       96320 blocks [2/1] [U_]

md1 : active raid1 sda1[0]
       979840 blocks [2/1] [U_]

# mdadm -D --scan
ARRAY /dev/md1 metadata=0.90 UUID=e905069f:43e2eaa4:e090bcab:b1d9c206
ARRAY /dev/md2 metadata=0.90 UUID=d259ec4f:1c63d0b1:e090bcab:b1d9c206
ARRAY /dev/md3 metadata=0.90 UUID=030d5ded:82314c21:e090bcab:b1d9c206

On dmesg:
[ 2349.760155] md: bind<sda1>
[ 2349.762677] md/raid1:md1: active with 1 out of 2 mirrors
[ 2349.762720] md1: detected capacity change from 0 to 1003356160
[ 2349.765307]  md1: unknown partition table
[ 2363.059235] md: bind<sda2>
[ 2363.061089] md/raid1:md2: active with 1 out of 2 mirrors
[ 2363.061129] md2: detected capacity change from 0 to 98631680
[ 2363.065812]  md2: unknown partition table
[ 2372.302358] md: bind<sda3>
[ 2372.304614] md/raid1:md3: active with 1 out of 2 mirrors
[ 2372.304663] md3: detected capacity change from 0 to 158936989696
[ 2372.308395]  md3: unknown partition table

My kernel config:
CONFIG_MD=y
CONFIG_BLK_DEV_MD=y
CONFIG_MD_AUTODETECT=y
CONFIG_MD_RAID1=y

# mdadm --examine /dev/sda3
/dev/sda3:
           Magic : a92b4efc
         Version : 0.90.00
            UUID : 030d5ded:82314c21:e090bcab:b1d9c206 (local to host dns)
   Creation Time : Tue Feb  1 19:03:30 2011
      Raid Level : raid1
   Used Dev Size : 155211904 (148.02 GiB 158.94 GB)
      Array Size : 155211904 (148.02 GiB 158.94 GB)
    Raid Devices : 2
   Total Devices : 1
Preferred Minor : 3

     Update Time : Tue Feb  1 19:18:56 2011
           State : clean
  Active Devices : 1
Working Devices : 1
  Failed Devices : 1
   Spare Devices : 0
        Checksum : 64a5bec0 - correct
          Events : 7


       Number   Major   Minor   RaidDevice State
this     0       8        3        0      active sync   /dev/sda3

    0     0       8        3        0      active sync   /dev/sda3
    1     1       0        0        1      faulty removed

I format the md* devices and copy file with rsync, alter the grub and 
fstab to boot md devices but on boot i have fail to boot md3 as rootfs

Atenciosamente,
Naira Kaieski



Em 1/2/2011 18:43, Leslie Rhorer escreveu:
>> I have read several articles on the internet and researched in the
>> messages list, but I'm still having trouble configuring a raid level 1
>> array that is bootable.
>>
>> I configured a server some time agowith Gentoo Linux, Kernel
>> 2.6.28-hardened-r9, mdadm - v3.0 and 2 IDE hard drives, this is working
>> correctly. For this installation iused as a basis for consultation
>> Article http://en.gentoo-wiki.com/wiki/Migrate_to_RAID
>>
>> Now, I want to use two SATA drives in raid level 1,
>>
>> Now i have Gentoo Linux with kernel  2.6.36-hardened-r6 and mdadm -
>> v3.1.4 and the instructions of Article dont work. The kernel was
>> configured with support for disks raid autodetect and supported the raid
>> level 1. But in the logs of dmesg does not run the auto-detection of the
>> disks to the array, so in the boot when mounting the root device /
>> dev/md2 the system can not find the device.
>>
>> When I run mdadm - auto-detect the array are found somewhere but still
>> displays message indicating that the raid device is not a valid
>> partition table.
>>
>> How can you configure a raid level 1 with bootable disks / dev / sda and
>> / dev / sdb?
>> I want three partitions:
>>       /dev/md1  - swap  - /dev/sda1, /dev/sdb1
>>       /dev/md2  - boot   - /dev/sda2, /dev/sdb2
>>       /dev/md3  - / - /dev/sda3, /dev/sdb3
>>
>> I am using grub as bootloader.
> 	This is very similar to my boot configuration on my two servers.  I
> suspect your problem is the metadata.  What version of superblock are you
> using for /dev/md2?  GRUB2 does not recognize a version 1.x superblock.
> Since the boot images are quite small, and don't require an array of many
> disks, there is nothing wrong with the 0.90 superblock, however.  If your
> /dev/md2 array is not a 0.9 version superblock, try converting it.  Here is
> my configuration from one of the servers:
>
> ARRAY /dev/md0 level=raid6 num-devices=10 metadata=01.2 name=Backup:0
> UUID=431244d6:45d9635a:e88b3de5:92f30255
> ARRAY /dev/md1 level=raid1 num-devices=2 metadata=0.90
> UUID=4cde286c:0687556a:4d9996dd:dd23e701
> ARRAY /dev/md2 level=raid1 num-devices=2 metadata=01.2 name=Backup:2
> UUID=d45ff663:9e53774c:6fcf9968:21692025
> ARRAY /dev/md3 level=raid1 num-devices=2 metadata=01.2 name=Backup:3
> UUID=51d22c47:10f58974:0b27ef04:5609d357
>
> 	Where md0 is a large (11T) data array, md1 is boot, md2 is root, and
> md3 is swap.  The partitioning layout of the boot drives is the same as
> yours.
>