[Bug 586134] Re: SC: Maximum number of loop devices should be configurable

[Chris Cheney]

** Description changed:

  Eucalyptus versions:
  
  ii  eucalyptus-common             1.6.2-0ubuntu30.1
  ii  eucalyptus-java-common        1.6.2-0ubuntu30.1
  ii  eucalyptus-sc                 1.6.2-0ubuntu30.1
  
  Bug 430846 and bug 498174 partially dealt with this issue. But, on an SC
  (perhaps also on the Walrus?) currently you cannot create more than 32
  volumes -- trying to create the 33rdvolume will fail with the SC
  reporting:
  
  ERROR [BlockStorage:pool-10-thread-5]
  com.eucalyptus.util.EucalyptusCloudException: Could not create loopback
  device for //var/lib/ eucalyptus/volumes/vol-xxxxxxxxx. Please check the
  max loop value and permissions
  
  This, of course, is an artificial restriction: Consider a SC with a few
  terabytes of disc space, and consider euca-create-volumes usually
  running with a few tens of giga for the allocation (-s)... the system
  very fast reaches saturation, and real disc utilisation is still
  (probably) in the few units of percent.
  
  So, either this should be set in /etc/eucalyptus/eucaliptus.*conf, or
  eucalyptus should dynamically create the needed /dev/loppxxx.
  
- *Notes*: 
+ *Notes*:
  (1) setting this on the upstart script would allow for an initial setup, but would require the SC to be restarted for the new value to take effect, which will probably cause a temporary interruption of volume service.
  (2) I wonder how the system would behave on a reboot...
+ 
+ ======
+ 
+ IMPACT:
+  * This bug affects people trying to create more than 32 SC volumes.
+ 
+ ADDRESSED:
+  * This bug is addressed by creating more loopback devices (512) in the eucalyptus-sc upstart job.
+ 
+ REPRODUCE:
+  * To reproduce this issue, try to create more than 32 SC volumes. You should not be able to do so.
+ 
+ REGRESSION POTENTIAL:
+  * The chances for regression are relatively low.
+ 
+ ======

-- 
SC: Maximum number of loop devices should be configurable
https://bugs.launchpad.net/bugs/586134
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