Alternatives to Windows Home Server Drive Extender?

I just discovered greyhole

It's for linux but in my opinion it's better than DE (at least there won't be demigrator.exe trashing the HDDs 24/7 in a way that forces me to stop it in the peak working hours, or there will be latency problems in the LAN when accessing files...)

And Amanda can do the computer backups. I have no reason to buy WHSv2 anymore.

Edit: I found the perfect linux distro to replace WHS! Amahi has greyhole installed by default. (And also a lot of useless multimedia servers)

Data Robotics will be very relieved that Microsoft is dropping Drive Extender, as the closest thing I know of that is anything like it is the range of Drobo devices. It's hardware and pretty expensive, but it fits all your requirements.

I've noticed that they are particularly popular with not-particularly-techy freelance creative professionals.

WHS isn't Drobo's closest competition... that title, I think, goes to Unraid. Check out Unraid at http://lime-technology.com/ ...

Yeah, it doesn't use "raid" technology, but it does use parity instead of duplication to offer the same storage efficieny as Drobo... Basically, you lose space equal to the largest installed hard drive.

The advantage of unraid seems to be that - like WHS - you can add as many drives as you need. Drobo is limited by it's physical slots, but WHS and Unraid are only limited by how many drive ports (sata, ide, usb, etc) you can build.

Like Drobo, Unraid is JUST storage - it doesn't do backup and other features like WHS...

I haven't built one yet, but it's what I'm looking at to replace WHS 1.0 when 1.0 finally reaches end of life.

I'm busy trying to make this a viable solution http://liquesce.codeplex.com/ It's hits the following requirements

• Easily add or remove drives (to gain more space or duplication)
  • Done via drag and drop
• Easy to set up and use (so RAID is out of the question)
  • Done via drag and drop
• Drive failure should leave data readable/recoverable on working disks
  • No change inthe source drives format or layout (i.e. no hidden directories etc.)
• Performance
  • The Speed of .Net 4 and the source drive via file streams
• Support drives larger than 2TB (WHS v1 does not support this)
  • If the Windows OS supports it (Including USB / Firewires) then it will be useable)
• Drives of different sizes
  • Yep
• Network enabled (SAMBA/CIFS)
  • Works on all Win OS's (Not targetted for Vista :-)

And with the Backup mode it performs something similiar to WHS1 by allowing duplicates on a different drive that the original, so mostly covers

• Redundancy (either through duplication of chosed folders, or through something equivalent to RAID level 5)