Problems with truecrypt

[sisqonrw]

Hi i am using truecrypt 6.3a on Lucid. i cant mount more the 8 containers. I get this error report:

Failed to set up a loop device:
/tmp/.truecrypt_aux_mnt9/volume

how can i fix this problem?

thanks

[GreyGeek]

Re: Problems with truecrypt

You can change the maximum number of loop devices(8 by default) with the max_loop=<number> kernel parameter in Grub, or you can manually create a new loop device at runtime:

mknod -m0660 /dev/loop9 b 7 9
chown root.disk /dev/loop9

Using mknod to create the additional loop back devices you need would seem to be a more permanent solution to the problem, and one which wouldn't change with a Grub change.

[sisqonrw]

Re: Problems with truecrypt

should i have to type

mknod -m0660 /dev/loop9 b 7 9
chown root.disk /dev/loop9

in the terminal?

[GreyGeek]

Re: Problems with truecrypt

Yes, but use "sudo" in front of those commands or they won't work.

[sisqonrw]

Re: Problems with truecrypt

i have type this 2 commands in the terminal but after a restart i get the same error report.

[GreyGeek]

Re: Problems with truecrypt

What does

vdir /dev/loop*

show?

You may have to change the kernel parameter after all...

[sisqonrw]

Re: Problems with truecrypt

I get this here:

vdir /dev/loop*
brw-rw---- 1 root disk 7, 0 2010-06-15 20:12 /dev/loop0
brw-rw---- 1 root disk 7, 1 2010-06-15 20:12 /dev/loop1
brw-rw---- 1 root disk 7, 2 2010-06-15 20:12 /dev/loop2
brw-rw---- 1 root disk 7, 3 2010-06-15 20:12 /dev/loop3
brw-rw---- 1 root disk 7, 4 2010-06-15 20:12 /dev/loop4
brw-rw---- 1 root disk 7, 5 2010-06-15 20:12 /dev/loop5
brw-rw---- 1 root disk 7, 6 2010-06-15 20:12 /dev/loop6
brw-rw---- 1 root disk 7, 7 2010-06-15 20:12 /dev/loop7

[sisqonrw]

Re: Problems with truecrypt

do you have a solution?

[GreyGeek]

Re: Problems with truecrypt

From vdir /dev/loop* it is obvious that your use of the mknod command was not correct. Only 8 loops are listed.

brw-rw---- 1 root disk 7, 0 2010-06-15 20:12 /dev/loop0
brw-rw---- 1 root disk 7, 1 2010-06-15 20:12 /dev/loop1
brw-rw---- 1 root disk 7, 2 2010-06-15 20:12 /dev/loop2
brw-rw---- 1 root disk 7, 3 2010-06-15 20:12 /dev/loop3
brw-rw---- 1 root disk 7, 4 2010-06-15 20:12 /dev/loop4
brw-rw---- 1 root disk 7, 5 2010-06-15 20:12 /dev/loop5
brw-rw---- 1 root disk 7, 6 2010-06-15 20:12 /dev/loop6
brw-rw---- 1 root disk 7, 7 2010-06-15 20:12 /dev/loop7

The proper commands, in a Konsole terminal, are:
sudo mknod -m0660 /dev/loop9 b 7 9
sudo chown root.disk /dev/loop9

After you do them redo "ls /dev/loop*" and see if you get /dev/loop9

Add as many as you need, and oon't forget that you may have to add max_loop=<number> as a kernel parameter in Grub,

[Snowhog]

Re: Problems with truecrypt

GG:
Are you attempting to get the OP a single additional loop device? If so, then shouldn't it be /dev/loop8 (the numbering begins with 0)?

[sisqonrw]

Re: Problems with truecrypt

ok. i have to type

sudo mknod -m0660 /dev/loop9 b 7 9
sudo chown root.disk /dev/loop9

in the terminal.
What do you mean with:

After you do them redo "ls /dev/loop*" and see if you get /dev/loop9

GreyGeek replied:

Just listing the contents of the /dev directory that begin with "loop"

and how can i do this:

Add as many as you need, and oon't forget that you may have to add max_loop=<number> as a kernel parameter in Grub,

GreyGeek replied:

You can test it by editing your default grub menu line and adding it to the end of the line.
https://help.ubuntu.com/community/Grub2
Go to the section titled "Editing Menus During Boot"

[sisqonrw]

Re: Problems with truecrypt

Hi all,

can someone help me? do someone have the same problem? i am not a expert. do someone have a step by step solution for me?

thanks!

[sisqonrw]

Re: Problems with truecrypt

You can change the maximum number of loop devices(8 by default) with the max_loop=<number> kernel parameter in Grub, or you can manually create a new loop device at runtime:

mknod -m0660 /dev/loop9 b 7 9
chown root.disk /dev/loop9

Using mknod to create the additional loop back devices you need would seem to be a more permanent solution to the problem, and one which wouldn't change with a Grub change.

hi what i have to type when i want to mont 15 containers at one time? should i type:

mknod -m0660 /dev/loop9 b 7 15
chown root.disk /dev/loop15

?

[GreyGeek]

Re: Problems with truecrypt

No.

Your system probably already has 8 loop devices (/dev/loop0 through /dev/loop7). If you want 15 loop devices then you must add /dev/loop8 through /dev/loop14.

mknod -m 660 /dev/loop8 b 7 8
mknod -m 660 /dev/loop9 b 7 9
mknod -m 660 /dev/loop10 b 7 10
mknod -m 660 /dev/loop11 b 7 11
mknod -m 660 /dev/loop12 b 7 12
mknod -m 660 /dev/loop13 b 7 13
mknod -m 660 /dev/loop14 b 7 14

The "b" parameter signifies a block (buffered) device. "7" in the Major number and the digits "8" through 14" are the miNor numbers. A list of Linux major and minor numbers, maintained by Alan Cox, can be found at http://www.lanana.org/docs/device-list/devices-2.6+.txt

Don't get the loopN and the minor number N mixed up. It will confuse YOU (not Linux).

Then:
chown root.disk /dev/loop8
chown root.disk /dev/loop9
chown root.disk /dev/loop10
chown root.disk /dev/loop11
chown root.disk /dev/loop12
chown root.disk /dev/loop13
chown root.disk /dev/loop14

[sisqonrw]

Re: Problems with truecrypt

should i have to type

mknod -m0660 /dev/loop9 b 7 9
chown root.disk /dev/loop9

in the terminal?

i thought that i have fix the problem with this 2 commands. but i get the same error report after restart of my pc. whats wrong?