Ubuntu Servers :: Separate Non Raid Boot Partition?

Aug 9, 2011

I have been working in my spare time over the last few days, Had problems with the whole grub2 not installing on RAID 1. Then I found out that I had to have a separate non raid Ext4 partition on one drive with "/Boot" as mount point and install went though fine.

My question is, will the developers FIX this. I mean if I only have 2 x 2tb drives in teh pc as RAID 1, and the one fails with the boot partition the whole machine goes down. Kinda defeats the whole RAID feature huh.

I USED to run a windows network with RAID 5 servers, and windows never had a problem installing everything on the RAID. Or even setting up RAID 1 in the bios on the PC and installing XP or NT4 on the RAID 1. There was never a need for a separate non raid boot partition.

Do we need a separate RAID friendly/enabled Grub? I guess for now I will get a 250gb drive and install the Server OS to it, and setup RAID1 manually after the server OS boots. Then will make a ghost type image of the server in case that drive fails so I can quickly install a new drive and restore the image and get it back up and running again.

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Ubuntu Installation :: Separate Boot Partition - Doesn't Care About The Boot Flag On The Disk

Feb 14, 2010

GNU GRUB 0.97
Ubuntu 8.04.4
2.6.24-26

Added an SSD (dev/sdc) and decided to move some less often changed directories there. Started with /usr and /boot, leaving / on a primary in the first drive, for now. All started ok, and my changed fstab mounted the right ones, and the system works.

However, grub is actually using the original /boot on / on sda1. I cannot see any way to change this. (Which makes it sorta hard to update the kernel

From grub:

Okay, since it has two choices, I tried to tell it which one to use. But, grub> root (hd2,5) does nothing.

Disk /dev/sda:

what I seem to recall, grub doesn't care about the boot flag on the disk. Nor does it care about primary vs. logical (except GNU doc says "makeactive" only works on a primary?).

The GNU doc also indicates that it looks for a directory /boot on the partition, so if you're mounting a partition as /boot, it also needs to contain a /boot directory under it. Tried that, but no change.

Is my problem the logical partition? Does that prevent "grub> root" from changing it? I'm afraid to wipe out the old /boot and find that I can't start up.

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Ubuntu :: Boot Partition To Be Kept Separate?

Nov 25, 2010

is their a boot partiton that need to be kept seperate in ubuntu? Screenshot.png those are my partitons in the pic above am i okay to merge them all into the dev/sda2 or is it like windows and i need to keep a small section back for the boot?

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Ubuntu Installation :: Cannot Use Separate /boot Partition With Grub 2

Aug 25, 2010

While installing with a separate /boot partition I cannot get two distinct copies of ubu installed on one machine and be able to choose between them. Each is installed on a different hard drive. x64 versions. I've had this issue both ways:

Stepsinstall mythbuntu
install ubuntu
Result

Two entries in grub. Both cause ubuntu to boot

Stepsinstall ubuntu
install mythbuntu
Result

Two entries in grub. Both cause mythbuntu to boot Grub 2 is so unfriendly for fixing these things. I don't know where to make changes. Ok, Grub 2 is very powerful, maybe it's the lagging documentation, or lack of tutorials that is the problem. But I don't know how to fix this. Do I start over without the /boot partition? Do I bail on ubu?

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Ubuntu Installation :: Boot From A Separate External Partition?

Nov 14, 2010

I have a 320gb USB hard drive, one partition for my files, one for playing Wii games, and one which I would like to use for an Ubuntu instillation.

To do this, I partitioned my disk accordingly using Windows, then booted from the Ubuntu CD to install the OS to my external hard drive partition. It asked me where I wanted to install the boot loader, so I selected the hard drive itself, rather than the specific partition, reasoning that it would scan the hard drive for a boot record.

However, when I booted it (with USB boot selected) it simply said "No Operating System found, replace system disk and press enter" or something similar.

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OpenSUSE Install :: Using A Separate Boot Partition?

Jan 26, 2010

P4 2.4gHZ 2.0GB Ram I have tried to do some reading on this by googling and such, but it is all a bit overwhelming and so many posts/articles want to deal with dual booting which I am not planning to do on this machine. I am trying to find some info on whether it is better to have a separate boot partition. As in, separate from root partition. I have read that a separate boot partition makes for a quicker start and better recovery if system crashes. I will shortly be installing openSuse 11.2(KDE) [currently on 11.0] and I want to optimise the partition scheme so that it is the most efficient. I have a 160GB HDD that will be housing this new installation, so space is not a problem. I am only user on this machine. Currently, it is just partitioned as such:

2.0GB - swap [because I read it should equal Ram]
32.0GB - /
40.0GB - /home
76.8GB - extra storage [Not really necessary as I have 2 other HDD on system 1 - 320GB and 1 - 200GB]

Also, is it recommended to have separate partitions for /tmp /var or any other /nnn ?

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Installation :: Boot From A Separate External Partition?

Nov 14, 2010

I have a 320gb USB hard drive, one partition for my files, one for playing Wii games, and one which I would like to use for an Ubuntu instillation.o do this, I partitioned my disk accordingly using Windows, then booted from the Ubuntu CD to install the OS to my external hard drive partition. It asked me where I wanted to install the boot loader, so I selected the hard drive itself, rather than the specific partition, reasoning that it would scan the hard drive for a boot record.However, when I booted it (with USB boot selected) it simply said "No Operating System found, replace system disk and press en

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General :: Boot From A Separate External Partition?

Nov 14, 2010

I have a 320gb USB hard drive, one partition for my files, one for playing Wii games, and one which I would like to use for an Ubuntu instillation. To do this, I partitioned my disk accordingly using Windows, then booted from the Ubuntu CD to install the OS to my external hard drive partition. It asked me where I wanted to install the boot loader, so I selected the hard drive itself, rather than the specific partition, reasoning that it would scan the hard drive for a boot record. However, when I booted it (with USB boot selected) it simply said "No Operating System found, replace system disk and press enter" or something similar.

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General :: Installed Windows On Separate Partition And Now Cannot Boot Ubuntu

Feb 3, 2010

I originally had my full hard drive as a full Ubuntu partition but I then re-sized that and installed Windows on a new partition. Now I guess the boot sector got overwritten and I don't have a choice to boot either Windows or Ubuntu. I know I have to reconfigure GRUB or another boot loader to allow the choice but I am not sure of how to go about that.

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Fedora Installation :: Moving - Boot To A Separate Partition ?

Apr 23, 2009

Trying to dual-boot OpenSolaris and FC10 is difficult because Solaris grub doesn't know about ext3 and Fedora grub doesn't know about ZFS. I was able to rescue my FC10 installation by creating a new FAT16 partition and restoring /boot to it from a dump, and then doing a grub setup to it. A complication is that anaconda doesn't seem to be able to find /dev/md0 (both the Solaris and FC10 installs use mirrored disks).

This process moved the FC10 ext3 partition from /dev/sda3 to /dev/sda4, but the other half of the mirror is still /dev/sdb3.

When I boot FC10 I get a "can't load image" error from grub, but it still loads FC10 successfully. It makes no difference if menu.1st/grub.conf has "root (hd0,1)" (the FAT16 partition) or "root (hd0,3)" (the FC10 ext3 partition).

If a future yum update were to try to install a new kernel, my FAT16 partition would not be updated. It seems to me both these problems might be solved if I could move /boot from /dev/md0 to /dev/sda2 (/dev/sda2 is the FAT16 partition).

Rather than go through yet another install, would the following work?

from FC10, move /boot to (say) /boot.0
mkdir /boot
edit fstab to include "mount /dev/sda2 /boot"

If I try this and it doesn't work, I can't see any way to undo it since anaconda doesn't seem to be able to mount /dev/md0. If a grub guru sees this, perhaps they could suggest a better alternative, or if not, whether this will work or not.

Additionally, although there are two alternatives in menu.1st/grub.conf, grub doesn't display a menu - it goes directly to boot. Any idea why? I suppose this might be a Solaris stage1 grub problem...

Since FAT16 doesn't support links, it isn't possible to link grub.conf to menu.1st. Are they both required?

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Fedora Installation :: Triple Boot - Using The Separate Partition?

May 29, 2010

I am triple booting

Windows xp
UBUNTU 10.04
Fedora 13

Everything works fine, the setup went very well. But I got to thinking (A dangerous thing for me). In Ubuntu I am using separate partitions for / (root) and /home. I was wondering, during install of Fedora, could I use the separate partition I am using now for both root and /home for just / (root) and use the Ubuntu /home partition for Fedora (set the mount point for /home to the same partition as I did for Ubuntu and not format the drive)? This would allow me to seamlessly use the /home partition and not require duplication of files. I can mount the Ubuntu /home dir while in Fedora.I can share the /home partition with two different installs of Ubuntu (been there).

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Fedora :: Install Grub To A Partition And Link It To A Separate /boot?

Nov 20, 2009

Where can I install grub? I know it can be installed to the mbr of a hard drive. I also know it can be installed to a /boot partition. Can I install it to a lvm partition? Does it have to be /boot? grub-install --root-directory=/boot /dev/hda Does this command install grub to a partition and link it to a separate /boot? I have fedora, but this is a live cd. I need to learn where I can install grub2 to boot

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Installation :: Multibooting Multiple Distros With A Separate / Boot Partition For GRUB

Mar 27, 2010

Noobish question on multibooting multiple Linux distros. I have four of the current major Linux distributions. Each has been installed and run individually (no other Linux distribution installed) in a dual-boot configuration with Windoze. No problem.

What I want to do is install all four Linux distributions and multiboot them. Reading the internet it would seem this is a simple task with GRUB. The short version being - install a Linux distro with a separate /boot partition for GRUB and use GRUB to boot the other Linux distros from the GRUB boot menu.

So I installed one of the Linux distros with a separate partition for /boot. The distro installer installed GRUB in /boot and correctly setup a dual-boot configuration with Windoze. GRUB was installed to the MBR. Next I installed a second Linux distro in its own root partition and told the distros installer NOT to install GRUB to the MBR, but rather, to the boot sector of the root partion of the second Linux distro. Installation was uneventful (and I could access the second Linux partition from the first installed Linux distro, things looked ok). Then I added to following to the installed (MBR - /boot) GRUB's menu.lst:

Code: title lixux distro 2
root (hd0,7)

chainloader +1 After which I rebooted the system and the new entry for the second Linux distro now appears in the GRUB boot menu. I selected the second Linux distro from the boot menu and got the following GRUB error: Error 5 : Partition table invalid or corrupt
[Code]....

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Ubuntu Servers :: How Do You Enlarge Raid 6 Partition

May 13, 2011

I am trying to grow my array to make full use of my drives. I have a raid 6 using mdadm on my home server. The array used to consist of 6 1.5TB drives when it was created. Since then I've been replacing the 1.5TB drives with new 2TB drives. And now I have replaced the last 2 drives.

When I added the first 3 disks I did not use the whole disk for the raid partition but rather made it the same size as the 1.5 partitions. As it turns out this may have been a bad idea. (But it gave me another 3 partitions of 500GB that I turned into 1 disk using mhddfs.)

Now I'm trying to grow the array. I've been testing in a virtual enviroment on how to do it but I cannot find another method than this :

1) fail 1 disk.
2) re-partition the disk with the size of the whole disk.
3) re-add the drive as a spare.
4) start the now degraded array to let it resync.
5) wait quite a while. (aprox 5 hours)
6) start again from step 1 for the other disks.
7) use mdadm with grow command to enlarge the array
use resize2fs to fill array to max size

Now although since this is a raid 6, I keep some redundancy but I still worry about degrading the array so manny times and rebuilding the whole thing. I mean I read the thing out 3 or 4 times over doing this.

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Ubuntu Servers :: 4TB Raid Partition For Server ?

Sep 1, 2011

Quote:

EFI GUID Partition support works on both 32bit and 64bit platforms. You must include GPT support in kernel in order to use GPT. If you don't include GPT support in Linux kernel, after rebooting the server, the file system will no longer be mountable or the GPT table will get corrupted. By default Redhat Enterprise Linux / CentOS comes with GPT kernel support. However, *******if you are using Debian or Ubuntu Linux,******** you need to recompile the kernel. Set CONFIG_EFI_PARTITION to y to compile this feature.

Is this true? Ubuntu has no GPT support native to the server install? Never compiled a kernel. Is that of itself going to be a mind bender? How much doo doo am I going to get into if I haven't done it a few times? Trust me when I tell you its no thrill formatting and reformatting a 8tb raid drive or the individual disks if it screws up. Been on that ride way too long already. Need things to go smoothly. This is not a play toy server, but will be used in a business.

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Ubuntu Servers :: Partition RAID Device (MD0) And Then Format It?

Feb 26, 2011

I am finally, and happily ditching Windows IIS, SQL Server, and ASP in favor of LAMP. Not only will I save a bunch of money on operating systems but I've found php and MySQL development to be much faster than their Microsoft counterparts.Currently I have two W2008 and two Ubuntu servers running and doing virtually parallel tasks. I want to can the W2008 machines but I am not 100% sure of my Ubuntu mirrors.Everything seems to be working fine. I've copied tons of data back and forth as a primitive test but sometimes things work fine for all the wrong reasons. Here's where I get confused.

Question 1:Do I need to partition the RAID device (MD0) and then format it?From my experience this is necessary to get the device to mount.

Question 2:In this case was it also necessary to format the individual drive partitions?

Question 3:If I do a daily cat /proc/mdstat is this all I need to do to check the drive status.

Question 4:Is there any other check I can do to assure that the mirrors are created, mounted, and operating correctly?

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Fedora Installation :: On Vista - Keep The Windows Boot Loader And Also Install On A Usb Drive Or A Separate Partition

Aug 16, 2009

install fedora 11 on Vista I want to keep the windows boot loader and also install on a usb drive or a seperate partition that has 10GB free "install doesn't see partition's". Recently I installed ubuntu and had a major problem with booting, without having the usb drive connected I couldn't boot windows so uninstalled it. I'm trying to install now but install does'nt give me any option to select partitions from my drives one 320GB "portable, 3 partitions" and 80GB "main os 2 partitions one partition has 10GB free"

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Ubuntu Servers :: RAID-5 Recovery (spare/active) / Degraded And Can't Create Raid ,auto Stop Raid [md1]?

Feb 1, 2011

Could any RAID gurus kindly assist me on the following RAID-5 issue?I have an mdadm-created RAID5 array consisting of 4 discs. One of the discs was dropping out, so I decided to replace it. Somehow, this went terribly wrong and I succeeded in marking two of the drives as faulty, and the re-adding them as spare.

Now the array is (logically) no longer able to start:

mdadm: Not enough devices to start the array.Degraded and can't create RAID ,auto stop RAID [md1]

I was able to examine the disks though:

Code:
root@127.0.0.1:/etc# mdadm --examine /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 00.90.00
code....

Code:
mdadm --create --assume-clean --level=5 --raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
As I don't want to ruin the maybe small chance I have left to rescue my data, I would like to hear the input of this wise community.

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Ubuntu Servers :: Stuck At Boot With Raid (non Boot) In Fstab = Useless?

Nov 1, 2010

Forgive the terseness. I'm frazzled with this issue, perhaps I should have asked earlier. Every weekend for the past 2 months has been an endless cycle of 'repair broken system' off the install disk.

Installed from Ubuntu server 10.04LTS x86_64, + xfce-desktop Here is uname -a Linux ournas 2.6.32-25-server #45-Ubuntu SMP Sat Oct 16 20:06:58 UTC 2010 x86_64 GNU/Linux If I add my raid + lvm to the fstab file, the boot stalls, (no error it, just hangs waiting, forever). So that's a not very user friendly to start with.

I've tried the suggestions about UUID in fstab tried using LABEL instead, or even /dev/xxx. Every time it hangs. I've googled this endlessly and not found a solution. So don't ask why... since I seem to have tried every odd suggestion to fix this, I've lost track. There seems to be some consensus that whoever gave us plymouth laid an egg. Forgive me if I'm wrong, but did we need a better graphical boot if it breaks everything else?

[Code]...

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Ubuntu Servers :: Resize Raid Partition - Rebuild /dev/md2 Without Lost Any Datas ?

Jun 15, 2010

I've got 2 hard disk drives of 250GB, with this partitions :

All partitions are with format "linux raid software". I made 3 raid1 with them like that :

I want to clone them to news hdd of 500Gb, to have this partitions :

My problem, how can I resize partitions, before resize the array md2 with the command mdadm --grow /dev/md1 --size=max ?

After, how can I rebuild /dev/md2 without lost any datas ?

I'm using ubuntu-server 10.04 64bits.

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Ubuntu :: MD RAID Partition Lost On Boot, Every Time?

Sep 1, 2011

I have two disks in a RAID.

Code:
SATA device C465.76 GBATA WDC WD5000AVDS-6
SATA device D465.76 GBATA WDC WD5000AAKS-0

[code]....

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Hardware :: RAID Partition Not Showing On Boot?

Mar 11, 2010

I have 4 hard disks. 2 pair of RAID 1 (mirror). Both use the same RAID controller - Intel Marvell.When I boot, this is what is listed in /dev/mapper/:

Code:
crw-rw---- 1 root root 10, 59 2010-03-11 20:58 control
brw------- 1 root root 252, 0 2010-03-11 20:58 isw_bbjfjjdcg_Volume0

[code]...

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Software :: Possible To Boot From Hard Disk Having RAID Partition?

Mar 28, 2010

I wanted to implement raid5 such that one partition is from my laptop's hard disk and others from other hard disks. After making one partition a raid partition, I rebooted the system. The computer stopped mid-way during booting, and brought me to the shell. On typing fsck -p, it told me an unexpected error occured in the partition which I had made for raid. Is there some condition that we cannot boot from a disk containing one of the raid partitions ?

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Ubuntu Servers :: RAID And Hang On Boot Displaying With 10.04

May 15, 2010

I was having this issue with my server when I tried upgrading (fresh install) to 10.04 from 9.04. But to test it out after going back to 9.04 I installed 10.04 server in a virtual machine and found the same issues. I was using the AMD64 version for everything. In the virtual machine I chose openssh and samba server in the initial configuration. After the install I ran a dist-upgrade and installed mdadm. I then created an fd partition on 3 virtual disks and created a RAID5 array using the following command:

Code: sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sd[b-d]1

This is the same command I ran on my physical RAID5 quite a while ago which has been working fine ever since. After running a --detail --scan >> mdadm.conf (and changing the metadata from 00.90 to 0.90) I rebooted and found that the array was running with only one drive which was marked as a spare. On the physical server I kept having this issue with one drive which would always be left out when I assembled the array and would work fine after resyncing until I rebooted. After I rebooted the array would show the remaining 6 drives (of 7) as spares.

I updated mdadm to 3.1.1 using a deb from debian experimental and the RAID was working fine afterward. But then the boot problems started again. As soon as I added /dev/md0 to the fstab the system would hang on boot displaying the following before hanging:

[Code]....

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Ubuntu Servers :: Getting Md Raid To Auto Assemble On Boot

Jun 20, 2011

I have Ubuntu 10.10 (maverick) and I'm using mdadm 3.1.4. I have created a RAID 10 using imsm as the metadata, and this runs successfully if I assemble the RAID from the command line. My question is: How do I get the RAID to auto assemble when I boot the system? I would like to be able to mount the RAID when the system starts up (but the OS is on a separate disk altogether). What I've found out so far is that I must do a Code: update-initramfs -k all -u AFTER I've modified the /etc/mdadm/mdadm.conf file. This is what I've got in my configuration file:

[Code]....

BUT what happens is that when I reboot my server, and then do "ls -l /dev/md*" there is no listing at all for any RAID devices. I actually have to run the assemble command on command line and that is when I see listings for RAID devices under /dev. What am I missing?

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Ubuntu :: RAID 5 Setup - Two Separate Arrays Defined

Jan 9, 2011

I'm trying to setup a RAID 5 array of 3x2TB drives and noticed that, besides having a faulty drive listed, I keep getting what looks like two separate arrays defined. I've setup the array using the following :
sudo mdadm --create /dev/md01 --verbose --chunk=64 --level=5 --raid-devices=3 /dev/sdb /dev/sdc /dev/sde

So I've defined it as md01, or so I think. However, looking in the Disk Utility the array is listed as md1 (degraded) instead. Sure enough I get :cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid5 sde[3](F) sdc[1] sdb[0]
3907028992 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]

So I tried getting info from mdadm on both md01 and md1 :user@al9000:~$ sudo mdadm --detail /dev/md1
/dev/md1:
Version : 00.90
Creation Time : Sun Jan 9 10:51:21 2011
Raid Level : raid5 ......

Is this normal? I've tried using mdadm to --stop then --remove both arrays and then start from scratch but I end up in the same place. I'm just getting my feet wet with this so perhaps I'm missing some fundamentals here. I think the drive fault is a separate issue, strange since the Disk Utility says the drive is healthy and I'm running the self test now. Perhaps a bad cable is my next check...

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Ubuntu Installation :: Dual Boot With Windows XP On A 1TB RAID-0 Setup - Create A SWAP Partition

Mar 20, 2011

(This is for a 100% Clean install)

Q1) I was wondering if it is possible to Dual boot Ubuntu with Windows XP on a 1TB RAID-0 setup ?

Q2) Also, is it possible to create a SWAP partition (for Ubuntu) on a NON RAID-0 HDD ?

Q3) Lastly... I read GRUB2 is the default boot manager... should I use that, or GRUB / Lio ?

I have a total of 3 HDDs on this system:
-- 2x 500GB WDD HDDs (non-advanced format) ... RAID-0 setup
-- 1x 320GB WDD HDD (non RAID setup)
(The non RAID HDD is intended to be a SWAP drive for both XP and Ubuntu = 2 partitions)

I plan on making multiple partitions... and reserve partition space for Ubuntu (of course).

I have the latest version of the LiveCD created already.

Q4) Do I need the Alternate CD for this setup?

I plan on installing XP before Ubuntu.

This is my 1st time dual booting XP with Ubuntu.

I'm using these as my resources:
- [url]
- [url]

Q5) Anything else I should be aware of (possible issues during install)?

Q6) Lastly... is there anything like the AHCI (advanced host controller interface) like in Windows for Ubuntu?

(Since I need a special floppy during Windows Install...) I want to be able to use the Advanced Queuing capabilities of my SATA drives in Ubuntu.

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Ubuntu Servers :: RAID AFU / Server Won't Boot After Upgrading To Lucid RC1?

Apr 22, 2010

Ran 'do-release-upgrade -d'on my server running Hardy.No problems during the upgrade.Rebooted after the upgrade completed, and I was presented with the new plymouth screen. This sucks for servers.It sat there displaying the logo for ~5 minutes.Hit CTRL+ALT+F1 through F8 and didn't see anything on the virtual consoles.Finally figured out that I had to hit ESC on the plymouth screen to actually see what was going on.It said /dev/sdi1 had problems along with /dev/md0.It sat there forever with no fsck status and no HDD lights blinking.

SysRq+REISUB and tweaked the boot parameter to remove 'quiet splash' and appended 'S' for single-user mode.Got the attached screenshot.The box has been sitting like this for ~15 minutes.Not entirely sure what to report a bug against at the moment. Plus the somewhat-new requirement of running 'ubuntu-bug' is pretty retarded in this situation. (Yeah, I know I can add some string to the URL to get around it.Why is it such a pain in the *** to report a bug?)I'm going to do some more digging to try and find out what is dying during boot.The new boot process is a bit of a mystery to me still, so if anyone has pointers or any devs want more detailed information,

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Ubuntu Servers :: Install Boot Loader Into RAID 10 Setup?

Oct 3, 2010

i installed ubuntu server on a 4-hard disk system, i installed with the RAID 10 support that comes with 10.04 server optioon. my raid swap is /dev/md0 and my raid data partition is /dev/md1

hard drives are /dev/sda /dev/sdb /dev/sdc /dev/sdd

the instalation goes fine, from the 8TB im getting 4TB mirrored which is what i want,
but the instalation setup goes up to the point where it asks me to install grub boot loader, There i choose the default option and it does a fatal error.

my main goal is just to make it bootable, any method is welcome. this went beyond my RAID knowledge (more conceptual than technical)

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Ubuntu Servers :: Raid Array Incorrectly Assembled On Boot

Feb 20, 2011

I've got a couple of new hard disks that I have partitioned (3 partitions per disk) and set up in a mirrored software raid array using mdadm. They've synced, I've put file systems on them (1 x ext4, 2 x luks + ext4) and I can mount them. I've checked the partitions using fdisk. I've checked the filesystems using fsck. So far so good. Next step is that I'd like mdadm to automatically assemble them on boot. (Not bothered about mounting and crypttabing yet.)

I've used sudo /usr/share/mdadm/mkconf to generate a new mdadm.conf with the appropriate UUIDs for the new partitions. I've checked that this matches the output of sudo mdadm --detail --scan

The new lines in this file are:

ARRAY /dev/md9 level=raid1 num-devices=2 UUID=470fb8a6:45561fe0:ebda4a02:9ba7a1ed
ARRAY /dev/md10 level=raid1 num-devices=2 UUID=f351fbba:c704a4b2:ebda4a02:9ba7a1ed
ARRAY /dev/md8 level=raid1 num-devices=2 UUID=c6ccec17:2274588e:ebda4a02:9ba7a1ed

To check that the mdadm.conf is fine I have stopped the new arrays:

[Code].....

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