On 09/04/2012 02:06 PM, Chris Friesen wrote:
Hi,
I'm not really a filesystem guy so this may be a really dumb question.
We currently have an issue where we have a ~1TB RAID1 array that is mostly
given over to LVM. If we swap one of the disks it will rebuild everything,
even though we may only be using a small fraction of the space.
This got me thinking. Has anyone given thought to using the TRIM information
from filesystems to allow the RAID code to maintain a bitmask of used disk
blocks and only sync the ones that are actually used?
Presumably this bitmask would itself need to be stored on the disk.
Thanks,
Chris
Device mapper has a "thin" target now that tracks blocks that are allocated or
free (and works with discard).
That might be a basis for doing an focused RAID rebuild,
Ric
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
