JLS2009: A Btrfs update
Posted Oct 29, 2009 14:03 UTC (Thu) by droundy
Parent article: JLS2009: A Btrfs update
Anybody who has had to replace a drive in a RAID array knows that the
rebuild process can be long and painful. While all of that data is being
copied, the array runs slowly and does not provide the usual protections.
The advantage of running RAID within Btrfs is that the filesystem knows
which blocks contain useful data and which do not. So, while an MD-based
RAID array must copy an entire drive's worth of data, Btrfs can get by
without copying unused blocks.
Isn't this something that could be achieved in an ordinary RAID if
filesystems supported the TRIM feature that has been touted for SSDs?
Does anyone know if this is being worked on?
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