Re: Data Deduplication with the help of an online filesystem check

Tomasz Chmielewski
2009-04-28T16:04:06Z

Thomas Glanzmann schrieb:

> 300 Gbyte of used storage of several productive VMs with the following
> Operatings systems running:
> \begin{itemize}
> \item Red Hat Linux 32 and 64 Bit (Release 3, 4 and 5)
> \item SuSE Linux 32 and 64 Bit (SLES 9 and 10)
> \item Windows 2003 Std. Edition 32 Bit
> \item Windows 2003 Enterprise Edition 64 Bit
> \end{itemize}
> \begin{tabular}{r|r|r|l}
> blocksize & Deduplicated Data \\
> \hline
> 128k & 29.9 G \\
> 64k & 41.3 G \\
> 32k & 59.2 G \\
> 16k & 82 G \\
> 8k & 112 G \\
> \
>
> Bottom line with 8 K blocksize you can get more than 33% of deduped data
> running a productive set of VMs.

Did you just compare checksums, or did you also compare the data "bit
after bit" if the checksums matched?

--
Tomasz Chmielewski