Jason Bradfield wrote:
Thanks Jeff.
FYI, These zones will be allocated to different clients each with root
access to their zone and running their own software.
Ah. Yes, that would indicate tighter controls. You could even charge more
for a higher cap... ;-)
Jeff Victor wrote:
Jason Bradfield wrote:
Ok.. to solve my immediate problem 16GB Physical and 16GB disk =
total of 32GB Virtual
If I were to create 3 zones and wanted to evenly allocate memory to
all 3 and the global zone, would this config be ok
zonecfg:host30> add capped-memory
zonecfg:host30:capped-memory> set physical=4G
zonecfg:host30:capped-memory> set swap=8G
zonecfg:host30:capped-memory> end
Memory capping isn't really intended to solve the 'problem' of
allocating memory, because usually there isn't a problem. Memory
capping is intended to prevent memory hogs (accidental or otherwise)
from impacting proper operation of other workloads. This allows you
to choose large caps, improving resource usage efficiency.
With some v12n solutions, allocating memory is required. This has the
potential of wasting memory - if one virtual server is not using all
of its memory, another cannot.
With zones, memory allocation (and its wastefulness) is not necessary.
Further, choosing a physical memory cap that is too low will result in
unnecessary paging activity, which will significantly reduce
performance on that one zone, and also affect performance of other
zones, to some extent.
However, if you want to ensure that one zone does not use too much and
impact other zones, measure (or estimate) its normal memory usage, and
choose a value larger than that. After the zone is running, "prstat
-Z" can be used to measure memory usage, both physical and swap.
With all of that in mind, in your situation I would choose much larger
numbers than the ones shown above. But without understanding the
normal resource consumption of your workloads, I can't guess at good
values.
Finally, it usually helps to know that those caps can be changed while
the zone is running, using rcapadm from the global zone.
--
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Jeff VICTOR Sun Microsystems jeff.victor @ sun.com
OS Ambassador Sr. Technical Specialist
Solaris 10 Zones FAQ: http://www.opensolaris.org/os/community/zones/faq
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