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Performance dell'uso di un VHD cifrato con EFS

EFS è il servizio di Windows 2000/XP/2003 che permette di cifrare file e cartelle.

Ci sono dei casi in cui è molto utile utilizzarlo per proteggere dati sensibili memorizzati sui dischi virtuali (specialmente nel caso di Virtual Server), ad esempio di macchine virtuali che fanno da Domain Controller.

In questo thread sul newsgroup di Virtual Server si discute soprattutto degli impatti sulle performance di una soluzione del genere.

Riporto solo una frase molto significativa, ma vi consiglio di leggere tutto il post se interessati:

     Test results showed barely a 5% increase in host CPU utilization when
running at peak load, by comparison to the same load where the VPC was
unencrypted.  Either way we couldn’t get the CPU load beyond 45-50% on
average.  There was no discernable increase in CPU load on the guest VPC when
using EFS.  Disk and memory utilization on the host increased negligibly
after the VHD was encrypted.  There was no noticeable degradation of host or
guest performance/responsiveness after the VHD was encrypted.

Naturalmente in questo post con VPC si intende una macchina virtuale, e non Virtual PC 2004...

Print | posted on Tuesday, March 7, 2006 11:55 PM |

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