Just following up on this... does anyone know if any of this is
technically feasible even if not implemented/supported today?

Also, do any hardware RAID1 implementations offer something like the
full btrfs checksum functionality?

I've seen HP promoting their `Advanced Data Mirroring' in new Smart
Array products, but I've got no idea if that is just a marketing
gimmick, like the way they use the name `Advanced Data Guard' as a
moniker for RAID6

Looking around in Google, I was pleasantly disturbed to find so many web
sites (including some vendors) using the term `checksum' to refer to a
parity bit

On 22/08/12 13:05, Daniel Pocock wrote:

It is well documented that btrfs data recovery (after silent corruption)
is dependent on the use of btrfs's own RAID1.

However, I'm curious about whether any hardware RAID vendors are
contemplating ways to integrate more closely with btrfs, for example,
such that when btrfs detects a bad checksum, it would be able to ask the
hardware RAID controller to return all alternate copies of the block.

Is this technically possible within any hardware RAID device today, even
though not implemented in btrfs?

Has there been any suggestion that vendors would support this in future,
presumably for the benefit of btrfs, ZFS and other checksumming filesystems?
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