[Typo3-typo3org] Hosting the TYPO3 sites

[Jan-Hendrik Heuing [NF]]

Correct, but it's not the case, that VM Ware is used.

JH

"Bodo Eichstädt" <be at typo3cluster.com> schrieb im Newsbeitrag 
news:mailman.1441.1113298358.3743.typo3-team-typo3org at lists.netfielders.de...
> 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
>
> pro:
> - real secure context of ram, applications, customers, files, ...
>
> con:
> - Perfomance loss
>
>
> for chroot-like semi-virtual servers:
> CPU minus 5-10 %
> RAM minus a few MB max.
>
> pro:
> - 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
>
> con:
> - 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 
> chroot/virtual server
>
>
> 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, ...
>
>
> PLUS:
> 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 machines. ;-)
>
>>
>> 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! :)
> I too!
>
>
> Greetings,
> Bodo
>
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