[Typo3-typo3org] Hosting the TYPO3 sites
be at typo3cluster.com
Tue Apr 12 11:32:26 CEST 2005
Mathias Schreiber [wmdb] schrieb:
> Peter Niederlag wrote:
>> Does anybody have any figures on how effcient such a "virtual layer" is?
> hm, hard to say.
I have seen benchmark comparisons:
for "real" virtual servers (VMWare,...)
CPU minus 20% - 30 %
RAM minus 50-200 MB
- real secure context of ram, applications, customers, files, ...
- Perfomance loss
for chroot-like semi-virtual servers:
CPU minus 5-10 %
RAM minus a few MB max.
- minimal performance loss (up to not measurable)
- applications (Apache!!) of the instances/customers can (in some
implementations) share mem, thus can save huge amounts of memory
- no real dedicated context for application (a security flaw will
perhaps affect all instances/clients)
- a security flaw can result in the posibility to breaking out of
To sum up:
Only when clients don't trust each other or installations must be real
secure against each other =>
real virtual server, e.g. VMWare, ...
The option to create new machines does reduce the over-all, the avereage
and the peak performance step by step. So keep an eye on peak and
average load. But to be fair, that's nothing special to virtual
> Plus you can start the backup machine with another IP (or the
> (virtual) LAN cable detached)) and then copy stuff from machine A to
> machine B in no time (because same HD on the host).
Copying a site inside a NAS / SAN is almost as fast or faster when the
server is using such... ;-)
> I like it :)
I know! :)
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