Ubuntu
eucalyptus package

Maximum number of 8 loopback devices low for SC

Bug #498174 reported by Torsten Spindler
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
eucalyptus (Ubuntu)
Fix Released
High
Dustin Kirkland 

Bug Description

The default Ubuntu kernel provides only 8 loopback devices. Setting more is possible with the max_loop=<number> on the kernel boot parameters line in /boot/grub/grub.cfg. It would be great if this can be done automagically for a host configured as Storage Controller.

Background is that we had a training class this week where with 6 students creating volumes we were running out of volumes quickly. I realise that this might happen in larger clouds with many instances much faster.

Torsten Spindler (tspindler)
Changed in eucalyptus (Ubuntu):
importance: Undecided → Wishlist
Revision history for this message
Torsten Spindler (tspindler) wrote :

I just learned that the number of loop back devices is managed dynamically by the kernel. However, the number of actual loop back devices in /dev/ is set to 8 by default. Creating new ones can be done with

$ sudo mknod b 7 <number> /dev/loop<number>

Revision history for this message
Dustin Kirkland  (kirkland) wrote : Re: [Bug 498174] Re: Maximum number of 8 loopback devices low for SC

Actually, we have the following in the eucalyptus-nc upstart script:

        for i in $(seq 0 31); do
                [ -b /dev/loop$i ] || (mknod -m 660 /dev/loop$i b 7 $i
&& chown root:disk /dev/loop$i)
        done

I'll add it to the eucalyptus-sc upstart script as well.

Or perhaps just put it in the common one.

Changed in eucalyptus (Ubuntu):
importance: Wishlist → High
assignee: nobody → Dustin Kirkland (kirkland)
status: New → Triaged
Dustin Kirkland  (kirkland)
Changed in eucalyptus (Ubuntu):
status: Triaged → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package eucalyptus - 1.6.2~bzr1103-0ubuntu2

---------------
eucalyptus (1.6.2~bzr1103-0ubuntu2) lucid; urgency=low

  [ Dustin Kirkland ]
  * debian/control: add a recommends on bridge-utils, and a suggests
    on aoetools, per feedback from Dan
  * debian/eucalyptus-common.eucalyptus.upstart, debian/eucalyptus-nc.upstart:
    move the loop device creation to the common upstart script, since several
    eucalyptus components need this, LP: #498174
  * clc/modules/bootstrap/eucalyptus-bootstrap.c: fix broken build, "true"
    was undefined
 -- Dustin Kirkland <email address hidden> Sat, 19 Dec 2009 07:53:56 -0600

Changed in eucalyptus (Ubuntu):
status: Fix Committed → Fix Released
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