Issue 863 in ganeti: -B memory=default doesn't act as expected

[ganeti]

Status: New
Owner: ----

New issue 863 by bcandler...@googlemail.com: -B memory=default doesn't act  
as expected
http://code.google.com/p/ganeti/issues/detail?id=863
[ganeti 2.10.5 from wheezy-backports]

Here's an instance which is getting minmem/maxmem from cluster-wide  
defaults.

# gnt-instance info netdot14.ws.nsrc.org | grep mem
    mem_path: default ()
    maxmem: default (512)
    memory: default (512)
    minmem: default (256)

# gnt-instance modify -B memory=384 netdot14.ws.nsrc.org
# gnt-instance info netdot14.ws.nsrc.org | grep mem
    mem_path: default ()
    maxmem: 384
    memory: default (384)
    minmem: 384

<< so -B memory=xxx is like -B minmem=xxx,maxmem=xxx >>

# gnt-instance modify -B memory=default netdot14.ws.nsrc.org
# gnt-instance info netdot14.ws.nsrc.org | grep mem
    mem_path: default ()
    maxmem: 384
    memory: default (384)
    minmem: 384

Oops! What I expected was minmem and maxmem to be set back to defaults.  
Instead it has done nothing.

To get the expected behaviour you have explicitly set minmem and maxmem:

# gnt-instance modify -B minmem=default,maxmem=default netdot14.ws.nsrc.org
# gnt-instance info netdot14.ws.nsrc.org | grep mem
    mem_path: default ()
    maxmem: default (512)
    memory: default (512)
    minmem: default (256)

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