[Xen-users] max_loop device problem

["sadique@xxxxxxxxxxxxxxxxxxx" <sadique@xxxxxxxxxxxxxxxxxxx>]

Hi all,

Hope you are all doing well...

I had a problem on creating 9th domain in my system.

I am using Cent-OS 3.4 and xen-2.0.6..   Obviously it's a loop back 
device mount issue. I have my grub.conf entry as follows
title Xen-2.6
 root (hd0,0)
 kernel /xen.gz dom0_mem=65536
 module /vmlinuz-2.6.11.10-xen0 root=/dev/hda6 ro console=tty0 max_loop=256

ls -l /dev/loop*

brw-rw----    1 root     disk       7,   0 Sep  9  2004 /dev/loop0
brw-rw----    1 root     disk       7,   1 Sep  9  2004 /dev/loop1
brw-rw----    1 root     disk       7,  10 Sep  9  2004 /dev/loop10
brw-rw----    1 root     disk       7,  11 Sep  9  2004 /dev/loop11
brw-rw----    1 root     disk       7,  12 Sep  9  2004 /dev/loop12
brw-rw----    1 root     disk       7,  13 Sep  9  2004 /dev/loop13
brw-rw----    1 root     disk       7,  14 Sep  9  2004 /dev/loop14
brw-rw----    1 root     disk       7,  15 Sep  9  2004 /dev/loop15
brw-rw----    1 root     disk       7,   2 Sep  9  2004 /dev/loop2
brw-rw----    1 root     disk       7,   3 Sep  9  2004 /dev/loop3
brw-rw----    1 root     disk       7,   4 Sep  9  2004 /dev/loop4
brw-rw----    1 root     disk       7,   5 Sep  9  2004 /dev/loop5
brw-rw----    1 root     disk       7,   6 Sep  9  2004 /dev/loop6
brw-rw----    1 root     disk       7,   7 Sep  9  2004 /dev/loop7
brw-rw----    1 root     disk       7,   8 Sep  9  2004 /dev/loop8
brw-r--r--    1 root     root       7,   9 Jun 25 21:00 /dev/loop9

I created a sparse filesystem and tried to mount that on loop back device

[root@guava looptest]# mount -o loop  root_fs loop1/
mount: could not find any free loop device

[root@guava looptest]# mount -o loop=/dev/loop9  root_fs loop1/
ioctl: LOOP_SET_FD: Device or resource busy

Can anybody help me to sort out this issue.... We have another system 
with cent-OS 3.5 with only 3 domains. I tested that server by creating 
10 filesystems  and mounting them on loop back devices and found no 
problem on mounting more that 8. I also tested that with a fedora-core3 
machine and found no problem. So in this situation what is likely to be 
haunting this machine... I need a quick a reply since we are using xen 
in a production environment...
Thanks once again
Sadique

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