A better btrfs
Posted Jan 18, 2008 23:36 UTC (Fri) by giraffedata
In reply to: A better btrfs
Parent article: A better btrfs
Though I'm usually a great champion of layering, I like RAID in the filesystem better than RAID under the filesystem.
In addition to the benefits already stated, it speeds up builds and rebuilds because the filesystem knows which blocks contain no useful data. And the filesystem can avoid read-modify-write if it knows the stripe size.
RAID above the filesystem (RAIF) also has many of these features.
I think the main value of RAID in the block layer is that it works with a dumb filesystem. That, of course, isn't an argument against putting RAID in the filesystem.
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