[Openstack] A question about Filter Scheduler in Folsom

menghuizhanguo menghuizhanguo at gmail.com
Tue Oct 29 01:08:29 UTC 2013

tune the flavors ?
RamFilter ?

------------------ Original ------------------
From:  "Shai Ben Naphtali"<shaibn at liveperson.com>;
Date:  Oct 28, 2013
To:  "openstack"<openstack at lists.openstack.org>; 

Subject:  [Openstack] A question about Filter Scheduler in Folsom

I wanted to lunch an instance that is set with 16GB in Openstack  Folsom env. and when I looked at the logs, I saw that it failed to lunch on a host for not having enough memory:

 host '<removed for privacy>': free_ram_mb:20873 free_disk_mb:684032 does not have 16384 MB usable ram, it only has 14433.7 MB usable ram..

This  host has 64GB and currently has three instances in Active state that together  use only 24GB (16GB + 4GB + 4GB). 'top' tool in the host shows that it's using 56GB.

So my question is, how can you relay on filters if you  can't control the host resources? How can I limit the RAM that the host  uses and "reserve" that RAM for instances?



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