On 09/04/2012 02:21 PM, NeilBrown wrote:
On Tue, 04 Sep 2012 12:06:26 -0600 Chris Friesen<chris.friesen@xxxxxxxxxxx>
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.
Something like this?
http://neil.brown.name/blog/20110216044002#5
Something like that would indeed cover the use-case that triggered this.
Chris
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