Re: RFC: use TRIM data from filesystems to speed up array rebuild?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


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
--
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


[ATA RAID]     [Linux SCSI Target Infrastructure]     [Managing RAID on Linux]     [Linux IDE]     [Linux SCSI]     [Linux Hams]     [Device-Mapper]     [Kernel]     [Linux Books]     [Linux Admin]     [Linux Net]     [GFS]     [RPM]     [git]     [Photos]     [Yosemite Photos]     [Yosemite News]     [AMD 64]     [Linux Networking]

Add to Google Powered by Linux