• Reboot and you should be running from the degraded RAID arrays (if it fails, use the saved backup to reflash. You may need to use the hack at http://www.nslu2-linux.org/wiki/HowTo/MountDisksByLabel to overcome the Root Filesystem Bug)

• Save existing flash (cat /dev/mtdblock* > backup) and put it somewhere safe

• Use apex-env to add rootdelay=10 to cmdline to give extra time for RAID detection

• Save existing flash (cat /dev/mtdblock* backup) and put it somewhere safe

• mkfs or mkswap as needed on new partitions

• Reboot and you should be running from the degraded RAID arrays (if it fails, use the saved backup to reflash)

• Use mdadm to create new RAID drives with missing first disk

Yes. With both the Unslung-able firmware How to enable RAID support in Unslung-able and Debian (summary below). OpenSlug is capable of RAID support but nobody has tried it yet.

• Set type for new RAID partitions to fd (RAID autodetect)

Yes. With both the Unslung-able firmware and Debian. How to enable RAID support in Unslung-able. OpenSlug is capable of RAID support but nobody has tried it yet.

In order to make it work, make sure you have md and raid0,1,5 loaded into kernel.

For Debian (at least Lenny) the instructions at http://www.howtoforge.com/software-raid1-grub-boot-debian-etch work fine. Simply ignore the sections on Grub as update-initramfs reflashes the kernel and initramfs automatically and leave disks connected throughout the process. In summary (without details of each command):

• Install mdadm and initramfs-tools
• Use sfdisk or fdisk to partition the 2nd disk.
• Set type for new RAID partitions to fd IRAID autodetect)
• Use mdadm to create new RAID drives with missig first disk
• mksf or mkswap as needed on new partitions
• Save /etc/fstab and edit it to use /dev/md? (new RAID partitions)
• Save existing flash (cp /dev/mtdblock* backup) and put it somewhere safe
• update-initramfs -u to rebuild kernel and initramfs
• Copy all data to new RAID partitions
• Update /etc/mdadm/mdadm.conf on RAID array
• Restore original /etc/fstab (just in case)
• Reboot and you should be running from the degraded RAID arrays
• Update partitions on 1st disk to type fd (make sure partition sizes are the same)
• Use mdadm to add 1st disk partitions to RAID arrays

Raid1 is also working with DebianSlug (see http://wiki.nslu2-info.de/pmwiki.php/HowTo/DebianSlugRaid1 (German only)). The instructions are pretty much based on the Unslung Raid1 HowTo.

In order to make it work, make sure you have md and raid0,1,5 loaded into kernel.

Steinar adds: I've tried RAID1 in OpenSlug 2.70 and 3.10 (on flash cards). It works fine and a raid device can even be used as the root file system. It requires the md and the raid (like raid1) kernel modules, mdadm and some simple editing in the boot files.

Can I use RAID?

Raid1 is also working with DebianSlug (see http://wiki.nslu2-info.de/pmwiki.php/HowTo/DebianSlugRaid1 (German only)). The instructions are pretty much based on the Unslung Raid1 HowTo.

Steinar adds: I've tried RAID1? in OpenSlug 2.70 and 3.10 (on flash cards). It works fine and a raid device can even be used as the root file system. It requires the md and the raid (like raid1) kernel modules, mdadm and some simple editing in the boot files.

Can I use RAID?'

Yes. But currently only with the Unslung-able firmware. How to enable RAID support in Unslung-able. OpenSlug is capable of RAID support but nobody has tried it yet.