[CentOS-virt] SATA vs RAID5 vs VMware

Philip Gwyn liste at artware.qc.ca
Fri Oct 2 16:04:24 UTC 2009

On 25-Sep-2009 Benjamin Franz wrote:
> And I just learned something new. According to 
> http://communities.vmware.com/thread/105144;jsessionid=DE9B4FFB861971525BEDBD8
> 984F6A670?start=15&tstart=0 
> if you use /dev/shm for your tmpDirectory you don't pay the 'double the 
> memory' penalty. I am testing it now.

This is misleading.  As I undestand it, anything in a tmpfs that has been
opened with mmap(MAP_SHARED) will not pay the 'double the memory' penalty. 
/dev/shm is "simply" a standard place for a tmpfs.



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