new tests : v27.1 rebooted cluster, creating security groups, 
VNET_ADDRSPERNET="512"
VNET_PUBLICIPS="192.168.3.1-192.168.5.254"

launching vms :

export EMI=emi-4158125D
euca-run-instances $EMI -n 50 -k mykey -t c1.medium --addressing private 
--group group2
euca-run-instances $EMI -n 50 -k mykey -t c1.medium --addressing private 
--group group3
euca-run-instances $EMI -n 50 -k mykey -t c1.medium --addressing private 
--group group4
euca-run-instances $EMI -n 50 -k mykey -t c1.medium --addressing private 
--group group5
euca-run-instances $EMI -n 50 -k mykey -t c1.medium --addressing private 
--group group6
euca-run-instances $EMI -n 50 -k mykey -t c1.medium --addressing private 
--group group7
euca-run-instances $EMI -n 20 -k mykey -t c1.medium --addressing private 
--group group8

the vms are launching fine, but only 32 end up running, the others are 
terminated.
when i had the "ADDRSPERNET" problem the vm was not able to launch.

for the same cluster setup, yesterday it was 64 vms, now it's 32 ...

result : some entire groups are being terminated ??? (groups 2,5,6,7 ...)
euca-describe-instances
RESERVATION     r-4792084D      admin   group8
INSTANCE        i-206F04DF      emi-4158125D    172.19.28.6     172.19.28.6     
running         mykey   4       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-2C2305CC      emi-4158125D    172.19.28.5     172.19.28.5     
running         mykey   3       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-36F706F4      emi-4158125D    172.19.28.9     172.19.28.9     
running         mykey   7       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-392C06E4      emi-4158125D    172.19.28.10    172.19.28.10    
running         mykey   8       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-39C70871      emi-4158125D    172.19.28.8     172.19.28.8     
running         mykey   6       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-3C330773      emi-4158125D    172.19.28.17    172.19.28.17    
running         mykey   15      c1.medium       2009-10-28T11:24:28.108Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-408106F7      emi-4158125D    172.19.28.21    172.19.28.21    
running         mykey   19      c1.medium       2009-10-28T11:24:28.108Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-4206079D      emi-4158125D    172.19.28.12    172.19.28.12    
running         mykey   10      c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-44DF08E1      emi-4158125D    172.19.28.18    172.19.28.18    
running         mykey   16      c1.medium       2009-10-28T11:24:28.108Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-450D08F8      emi-4158125D    172.19.28.16    172.19.28.16    
running         mykey   14      c1.medium       2009-10-28T11:24:28.108Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-455E0828      emi-4158125D    172.19.28.13    172.19.28.13    
running         mykey   11      c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-47360859      emi-4158125D    172.19.28.19    172.19.28.19    
running         mykey   17      c1.medium       2009-10-28T11:24:28.108Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-50240846      emi-4158125D    172.19.28.15    172.19.28.15    
running         mykey   13      c1.medium       2009-10-28T11:24:28.108Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-51910966      emi-4158125D    172.19.28.7     172.19.28.7     
running         mykey   5       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-51990946      emi-4158125D    172.19.28.3     172.19.28.3     
running         mykey   1       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-546D0996      emi-4158125D    172.19.28.2     172.19.28.2     
running         mykey   0       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-5581095F      emi-4158125D    172.19.28.20    172.19.28.20    
running         mykey   18      c1.medium       2009-10-28T11:24:28.108Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-594D0A55      emi-4158125D    172.19.28.4     172.19.28.4     
running         mykey   2       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-5A3709C8      emi-4158125D    172.19.28.14    172.19.28.14    
running         mykey   12      c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-5BC40ACD      emi-4158125D    172.19.28.11    172.19.28.11    
running         mykey   9       c1.medium       2009-10-28T11:24:28.107Z        
intelone        eki-65F8175B    eri-48E316E3
RESERVATION     r-3E3D085B      admin   group4
INSTANCE        i-38EE064D      emi-4158125D    172.19.20.24    172.19.20.24    
running         mykey   22      c1.medium       2009-10-28T11:23:07.286Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-3E9C07D9      emi-4158125D    172.19.20.34    172.19.20.34    
running         mykey   32      c1.medium       2009-10-28T11:23:07.287Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-44530877      emi-4158125D    172.19.20.49    172.19.20.49    
running         mykey   47      c1.medium       2009-10-28T11:23:07.287Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-445A079B      emi-4158125D    172.19.20.44    172.19.20.44    
running         mykey   42      c1.medium       2009-10-28T11:23:07.287Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-47590810      emi-4158125D    172.19.20.29    172.19.20.29    
running         mykey   27      c1.medium       2009-10-28T11:23:07.287Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-4BAC0872      emi-4158125D    172.19.20.4     172.19.20.4     
running         mykey   2       c1.medium       2009-10-28T11:23:07.286Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-543C0959      emi-4158125D    172.19.20.9     172.19.20.9     
running         mykey   7       c1.medium       2009-10-28T11:23:07.286Z        
intelone        eki-65F8175B    eri-48E316E3
RESERVATION     r-34510772      admin   group3
INSTANCE        i-402206EA      emi-4158125D    172.19.18.29    172.19.18.29    
running         mykey   27      c1.medium       2009-10-28T11:23:06.69Z         
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-45B708C0      emi-4158125D    172.19.18.49    172.19.18.49    
running         mykey   47      c1.medium       2009-10-28T11:23:06.691Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-4A6108FB      emi-4158125D    172.19.18.24    172.19.18.24    
running         mykey   22      c1.medium       2009-10-28T11:23:06.689Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-4CA908BC      emi-4158125D    172.19.18.44    172.19.18.44    
running         mykey   42      c1.medium       2009-10-28T11:23:06.691Z        
intelone        eki-65F8175B    eri-48E316E3
INSTANCE        i-55AC0984      emi-4158125D    172.19.18.19    172.19.18.19    
running         mykey   17      c1.medium       2009-10-28T11:23:06.689Z        
intelone        eki-65F8175B    eri-48E316E3

now if i try to relaunch the group2 (50 vms), they are accepted,
"pending" and terminated ...

note that it's not a first instanciated first terminated queue : i have
vms from group 3 and 4 and not from groups 5 6 7.

strange.

-- 
maximum 61 "running" instances, others shutting down
https://bugs.launchpad.net/bugs/462140
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