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Re: [linux-lvm] Re: linux-lvm digest, Vol 1 #602 - 14 msgs

bash> cat /proc/lvm/VGs/data/LVs/develop

name: /dev/data/develop size: 20971520 access: 3 status: 1 number: 3 open: 1 allocation: 2 device: 58:03

(My VG is data, my LV is develop), the last line has the device number on it.

The other place to look is:

bash> ls -la /dev/data/develop

brw-rw---- 1 root disk 58, 3 Apr 12 17:56 develop

58,3 is (major, minor). The trick is figuring out which ones are decimal, and which ones are hex. I believe the ls -la are decimal, but when you put it in for root= it has to be in hex.

In this case, I believe 58 is the major, and 3 is the minor.
(I could be completely wrong on that decimal/hex thing, I just remember that being an issue for me in the past when looking at root= on the command line once in the past).

Ahhh, looking a bit more:

bash> stat /dev/data/develop

  File: "/dev/data/develop"
  Size: 0               Blocks: 0          IO Block: 4096   Block Device
Device: 309h/777d       Inode: 16521       Links: 1     Device type: 3a,3
Access: (0660/brw-rw----)  Uid: (    0/    root)   Gid: (    6/    disk)
Access: Fri Apr 12 17:56:53 2002
Modify: Fri Apr 12 17:56:53 2002
Change: Fri Apr 12 17:56:53 2002

Which would confirm that root= must be in hex, 3a (hex) = 58 (decimal). It has to be 4 digits long so in this case it would be "root=3a03". The Device Type: is where the 3a03 comes from...

Hope this helps.


James B. Byrne wrote:
On Thu, 30 May 2002 19:45:33 +0200
Thierry DE CARVALHO <thierry decarvalho online fr> wrote:

Try with grub (here /dev/vg00/lvol1 is the root fs):

title=GNU/Linux Debian 2.2 (potato)
kernel (hd0,1)/vmlinuz-2.2.19 root=3a00 ramdisk_size=8192 vga=10
#                                   ^^^^ <major><minor> of the lv
#                                   device
in hex
initrd (hd0,1)/initrd-lvm-2.2.19.gz

I am afraid that this does not make a lot of sense to me. Where does one get the major/minor numbers for the logical volume?

--- e-mail is NOT a secure channel James B. Byrne mailto:ByrneJB Harte-Lyne ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
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