Brian Behlendorf behlendorf1 at llnl.gov
Tue Oct 12 12:38:35 EDT 2010

I've never directly compared the performance of file vs block vdevs but I'm 
certain you will see a performance penalty.  How bad it will be is hard to 
say since it will depend on your particular setup and workload.  I would 
encourage you to try it and see if it performs well enough for your needs.


> How well does zfsonlinux perform when not using direct block devices,
> but rather fixed sized files on ext3 filesystem for example ?
> I'm looking to use zfs on a hosted server, wich already has its whole
> disk alocated for ext3 which by itself is installed on mirrored disks.
> Would there be a serious performance penalty or would a lot of ram
> already improve the sitatuation a lot?
> The features like dedup and snapshotting are so appealing to use for
> having for example some virtual machines running on that host.

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