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Slicehost uses XenSource.

Rackspace uses XenServer which is not quite the same thing.

Rackspace is migrating all slicehost customers to their XenServer based services and doing away with their XenSource product.

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XenServer and the xen.org stuff are very similar from the perspective of a guest. I mean, administering them is a little different, but not that different. there is rather a lot of shared code between the two systems; Xen.org generally gets newer features first, and xenserver has for-pay support.

Recently (well, I guess not that recently) the 'xl' command line from xenserver was given back to xen.org. it's a lot nicer than 'xm' I think.

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