I'm entertaining something which might be a little wacky, I'm wondering what 
your general reaction to this scheme might be :)


I would like to invest in some sort of storage appliance, and I like the idea 
of something I can grow over time, something that isn't tethered to my servers 
(i.e. not direct attach), as I'd like to keep this storage appliance beyond the 
life of my servers. Therefore, a RAID 5 or higher type setup in a separate 2U 
chassis is attractive to me.

I do a lot of virtualization on my servers, and currently my VM host is running 
VMWare Server. It seems like the way forward is with software based RAID with 
sophisticated file systems such as ZFS or BTRFS rather than a hardware RAID 
card and "dumber" file system. I really like what ZFS brings to the table in 
terms of RAID-Z and more, so I'm thinking that it might be smart to skip 
getting a hardware RAID card and jump into using ZFS. 

The obvious problem at this point is that ZFS is not available for Linux yet, 
and BTRFS is not yet ready for production usage. So, I'm exploring some 
options. One option is to just get that RAID card and reassess all of this when 
BTRFS is ready, but the other option is the following...

What if I were to run a FreeBSD VM and present it several vdisks, format these 
as ZFS, and serve up ZFS shares through this VM? I realize that I'm getting the 
sort of userland conveniences of ZFS this way since the host would still be 
writing to an EXT3/4 volume, but on the other hand perhaps these conveniences 
and other benefits would be worthwhile? What would I be missing out on, despite 
no assurances of the same integrity given the underlying EXT3/4 volume?

What do you think, would setting up a VM solely for hosting ZFS shares be worth 
my while as a sort of bridge to BTRFS? I realize that I'd have to allocate a 
lot of RAM to this VM, I'm prepared to do that.


Is this idea retarded? Something you would recommend or do yourself? All of 
this convenience is pointless if there will be significant problems, I would 
like to eventually serve production servers this way. Fairly low volume ones, 
but still important to me.
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