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Re: Software RAID question



On Sun, 2009-12-13 at 16:54 -0500, Jeffrey Ross wrote:
> I'm trying to mirror my two disks in my system (F12 x86_64)...
> 
> I have the following disk partitions
> Filesystem           1K-blocks      Used Available Use% Mounted on
> /dev/md127             7692840    508960   6793104   7% /
> tmpfs                  1016196       260   1015936   1% /dev/shm
> /dev/md1                380760     44094    316993  13% /boot
> /dev/sda6              7684844   3956688   3337780  55% /usr
> /dev/md5               7692776    418204   6883800   6% /var
> /dev/md7             934037448 388908936 497682148  44% /home
> 
> I am trying to get /dev/sda6 and /dev/sdb6 to become a RAID-1 volume...
> 
> I have created /dev/md6 as a degraded array and copied everything from 
> /dev/sda6 to /dev/md6 in single user mode (actually booted from the 
> recovery CD) and after mounting both partitions ran "find . -depth | 
> cpio --passthrough --reset-access-time --make-directories 
> --preserve-modification-time /mnt2"  (/dev/md6 was mounted on /mnt2).  
> The copy took a few minutes and completed successfully.
> 
> I then modified my /etc/fstab to read (only showing physical disks) (I 
> commented the old UUID and added the new UUID)
> 
> UUID=abcf3490-11d2-4641-bf47-c33d1614066d /       ext4    defaults 1 1
> UUID=e28d03fe-50ec-4313-a281-f1abecd4ed10 /boot   ext4    defaults 1 2
> # following is /dev/sda6
> #UUID=3b891301-1b89-447b-81e3-4ddc5c835b3f /usr    ext4    defaults 1 2
> # following is /dev/md6
> UUID=e0eb5abe-1765-48f7-923f-da8295b54313 /usr   ext4    defaults 1 2
> UUID=e35b19c3-b303-49fc-87d4-0712ac3de571 /var    ext4    defaults 1 2
> UUID=6f6600c4-5577-4617-b312-649fc2e2706a swap    swap    defaults 0 0
> UUID=93cc01f6-98e7-445b-bdc4-37356588e957 /home   ext4    defaults 0 0
> 
> My mdadm.conf file reads -
> 
> MAILADDR root
> ARRAY /dev/md1 level=raid1 num-devices=2 
> UUID=1c0ba7ba:5b4e8354:14c0bbc3:de3ed72e
> ARRAY /dev/md127 level=raid1 num-devices=2 
> UUID=1bcb5496:c7d158e6:14c0bbc3:de3ed72e
> ARRAY /dev/md3 level=raid1 num-devices=2 
> UUID=1cea36b2:9f1a3ab8:14c0bbc3:de3ed72e
> ARRAY /dev/md5 level=raid1 num-devices=2 
> UUID=ab27f39f:f0e972c9:14c0bbc3:de3ed72e
> ARRAY /dev/md7 level=raid1 num-devices=2 
> UUID=398fe67f:959048ba:14c0bbc3:de3ed72e
> ARRAY /dev/md6 level=raid1 num-devices=2 
> UUID=9b98d1c6:73b621e1:14c0bbc3:de3ed72e
> 
> 
> The entries for the disks in /dev/disk/by-uuid -
> lrwxrwxrwx 1 root root 10 2009-12-13 15:44 
> 3b891301-1b89-447b-81e3-4ddc5c835b3f -> ../../sda6
> lrwxrwxrwx 1 root root  9 2009-12-13 15:44 
> e0eb5abe-1765-48f7-923f-da8295b54313 -> ../../md6
> 
> 
> I copied the initramfs-2.6.31.6-166.fc12.x86_64.img file to another 
> directory and decompressed and extracted it and the only reference I 
> found in there to the raid disks was in etc/mdadm.conf which was 
> identical what is in /etc/mdadm.conf
> 
> I can mount /dev/md6 manually (as something other than /usr) with no issues
> 
> 
> I think I'm missing something pretty simple, another set of eyes would 
> be appreciated
> 
> TIA, Jeff

I assume that the new setup doesn't boot? (You didn't mention what's
wrong.)

What is the new partition type? (Should be "Linux raid autodetect" or
fb)

.. As for your fstab, why are you using the UUID? I usually remove the
UUID's and use the actual device name, IMHO its far easier to work
with...


- Gilboa


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