Re: TIER: combine SSDs and HDDs into a single block device

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On Thu, Aug 02, 2012 at 12:02:44PM -0500, Mark Nelson wrote:
> Alex is also trying to bug the XFS guys (and Sage bugged the BTRFS
> guys) about ways to put metadata on SSD while keeping data on
> spinning disk. It sounds like there is a hack for XFS that would let
> us keep inodes in the lower portion of a volume up to some
> configurable boundary and then we could use lvm to assign that
> portion of the volume to an SSD.  The BTRFS guys have a SOC project
> in the works to separate out metadata onto another disk.

Also with XFS you can use the realtime device for data and the main
device for all metadata.

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