Re: Fwd: [Xen-users] Overcoming loopback device limitation - revisited

["john maclean" <jayeola@xxxxxxxxx>]

 xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0      512     1 r-----  6956.8
centos0                            7       32     1 ------    15.2
centos1                            9       32     1 ------    15.2
centos2                           12       32     1 ------    15.5
centos3                           13       32     1 ------    21.4
centos4                           14       32     1 ------    15.2
centos5                           15       32     1 ------    15.0
centos6                           16       32     1 ------ 28452.9
centos7                           17       32     1 ------    14.4


I finally got there at about 05:10 this morning.
rmmod loop
modprobe loop max_loop=64
That did it. Had a look in the source code and
/usr/src/xen-3.0.2-2/pristine-linux-2.6.16/drivers/block/loop.c gave
me the clue.
"...
* Maximum number of loop devices when compiled-in now selectable by passing
* max_loop=<1-255> to the kernel on boot.
...static int max_loop = 8;"
That final line threw me as I thought I'd have to change that value
from 8 to something like 32. It finally occurred to me what everyone
was talking about.

Thanks chaps for your patience and time.

On 01/08/06, Steve Kemp <steve@xxxxxxxxxxxx> wrote:
> On Tue, Aug 01, 2006 at 01:06:04AM +0100, john maclean wrote:
> > still no joy. Managed to bring some domUs back to life though. Only
> > had one, now I got four.
>
> > acid:~# losetup -f
> > losetup: could not find any free loop device
>
>   Remove the max_loop setting from the boot line.
>
>   Instead run:
>
>   echo 'options loop max_loop=255' > /etc/modprobe.d/loop.local
>
>   Now if you have no domains running you should be able to do:
>
>     rmmod loop
>     modprobe loop
>     dmesg | grep loop
>
>   The last line should show you that you have >8 loaded.
>
> Steve
> --
--
John Maclean  - 07739 171 531
MSc (DIC)

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