If you don't understand the commands listed below DO NOT ATTEMPT THIS.

In fact, DO NOT ATTEMPT THIS unless you are *ABSOLUTELY* sure you know what youre doing. You can LOSE DATA if you are not careful when constructing the RAID.

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Raid1SampleDiversionScripts

Before attempting this, be sure you know how RAID works under Linux.

1. Disable USB_Detect, and possibly rc.bootbin using diversion scripts.

 # ./busybox hdparm -t /dev/md0

 # ./busybox hdparm -t /dev/md0

 =]

1. Using the BusyBox fdisk (call it like "/opt/bin/busybox fdisk /dev/sdx?), change the partition type to fd (raid autodetect)

1. Build the Unslung 3.x or later firmware using OE.

RAID can be enabled in the -able family of Unslung-2.x firmware or in the -standard family of Unslung 3.x firmware.

1. Download the mdadm ipk.

1. Unmount the drives that will form the raid array (e.g. umount /dev/sda)

1. ipkg install kernel-module-md kernel-module-raid1 (or raid0 if you prefer.) This will require access to the ipk directory created from the oe build, and a change to /etc/ipkg.conf to make it accessable. Expect depmod errors when installing these packages.

1. ipkg install kernel-module-md kernel-module-raid1 (or raid0 if you prefer.) This will require access to the ipk directory created from the oe build, and a change to /etc/ipkg.conf to make it accessable. Expect depmod errors when loading installing these packages.

Add a /etc/mdadm.conf file such as:

 
DEVICE /dev/sd[ab]1
ARRAY /dev/md0 devices=/dev/sda1,/dev/sdb1
        level=1
        num-devices=2
 

You will need to add lines to your diversion scripts. The following may be added to rc.local:

 
/opt/sbin/insmod md
/opt/sbin/insmod raid1
/opt/sbin/mdadm -As
 

RAID can be enabled in the -able family of Unslung-2.x firmware.

1. Build the -able firmware using OE.
2. Build mdadm from Unslung CVS.
3. Format 2 identical disks using the NSLU2 web interface
4. Build a special BusyBox that includes fdisk from Unslung CVS
5. Unsling
6. Disable USB_Detect
7. Using the BusyBox fdisk built in (4), change the partition type to fd (raid autodetect)
8. ipkg install kernel-module-md kernel-module-raid1 (or raid0 if you prefer)
9. mknod /dev/md0 b 9 0
10. Create the RAID array with mdadm.
11. Done.

 9) mknod /dev/md0 b 9 0 
 10) Create the raid with mdadm.
 11) done.

 # mke2fs -j /dev/md0
 (messages)

 (messages)

 # df /mnt/tmpmnt

 # ./busybox.dy hdparm -t /dev/md0

 /dev/md0:
  Timing buffered disk reads:  64 MB in  7.42 seconds =  8.63 MB/sec

 #

 # ./busybox.dy hdparm -t /dev/md0

 /dev/md0:
  Timing buffered disk reads:  64 MB in  5.78 seconds = 11.07 MB/sec

 #

sample raid1:

sample raid0:

 # insmod raid0
 Using /lib/modules/2.4.22-xfs/kernel/drivers/md/raid0.o
 # ./mdadm --create --level=0 --raid-devices=2 /dev/md0 /dev/sda1 /dev/sdb1
 mdadm: /dev/sda1 appears to contain an ext2fs file system
     size=40016880K  mtime=Wed Nov  3 23:17:26 2004
 mdadm: /dev/sda1 appears to be part of a raid array:
     level=1 devices=2 ctime=Wed Nov  3 23:16:38 2004
 mdadm: /dev/sdb1 appears to contain an ext2fs file system
     size=40016880K  mtime=Wed Nov  3 23:17:26 2004
 mdadm: /dev/sdb1 appears to be part of a raid array:
     level=1 devices=2 ctime=Wed Nov  3 23:16:38 2004
 Continue creating array? y
 mdadm: array /dev/md0 started.
 # mke2fs -j /dev/md0
 mke2fs 1.34 (25-Jul-2003)
 Filesystem label=
 OS type: Linux
 Block size=4096 (log=2)
 Fragment size=4096 (log=2)
 10010624 inodes, 20008384 blocks
 1000419 blocks (5.00%) reserved for the super user
 First data block=0
 611 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

 Writing inode tables: done                            
 Creating journal (8192 blocks): done
 Writing superblocks and filesystem accounting information: done 

 This filesystem will be automatically checked every 22 mounts or
 180 days, whichever comes first.  Use tune2fs -c or -i to override.
 # mount /dev/md0 /mnt/tmpmnt
 # df
 Filesystem           1k-blocks      Used Available Use% Mounted on
 rootfs                  123955     15465    107210  13% /
 /dev/sdb2               123955     15465    107210  13% /
 /dev/sdb2               123955     15465    107210  13% /share/flash/conf
 /dev/md0              78777008     32828  74742504   0% /mnt/tmpmnt
 # cat /proc/mdstat
 Personalities : [raid0] [raid1] 
 read_ahead 1024 sectors
 md0 : active raid0 sdb1[1] sda1[0]
       80033536 blocks 64k chunks

 unused devices: <none>
 # 

 1) Build the -able firmware using OE.
 2) Build mdadm from Unslung CVS.
 3) format 2 identical disks using the NSLU2 web interface
 4) Build a special busybox that includes fdisk from Unslung CVS
 5) Unsling
 6) Disable USB_Detect
 7) Using the busybox built in (4), change the partition type to fd (raid autodetect)
 8) ipkg install kernel-module-md kernel-module-raid1 (or raid0 if you prefer)
 9) Create the raid with mdadm.
 10) done.

RAID can be enabled in the -able family of UNSLUNG-2.x firmware.

1) Build the -able firmware using OE. 2) Build mdadm from Unslung CVS. 3) format 2 identical disks using the NSLU2 web interface 4) Build a special busybox that includes fdisk from Unslung CVS 5) Unsling 6) Disable USB_Detect 7) Using the busybox built in (4), change the partition type to fd (raid autodetect) 8) ipkg install kernel-module-md kernel-module-raid1 (or raid0 if you prefer) 9) Create the raid with mdadm. 10) done.

sample:

 # ./mdadm --create --level=1 --raid-devices=2 /dev/md0 /dev/sda1 /dev/sdb1
 mdadm: /dev/sda1 appears to contain an ext2fs file system
     size=40016880K  mtime=Wed Nov  3 23:08:47 2004
 mdadm: /dev/sdb1 appears to contain an ext2fs file system
     size=40016880K  mtime=Wed Nov  3 23:08:45 2004
 Continue creating array? y
 mdadm: array /dev/md0 started.
 # cat /proc/mdstat
 Personalities : [raid1] 
 read_ahead 1024 sectors
 md0 : active raid1 sdb1[1] sda1[0]
       40016768 blocks [2/2] [UU]
       [>....................]  resync =  0.2% (103040/40016768) finish=77.4min speed=8586K/sec
 unused devices: <none>
 # mount /dev/md0 /mnt/tmpmnt
 Filesystem           1k-blocks      Used Available Use% Mounted on
 /dev/md0              39388776     32832  38955776   0% /mnt/tmpmnt

Enjoy!