Re: Does dm-thin support GC (garbage collection) ?
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I created pool without ignore_discard feature, is this the way to enable discard? I mounted the ext4 with '--discard' args, I will trace whether the ext4 really issue discard later. Thanks. Regards, Busby 2012/5/8, Joe Thornber <thornber@xxxxxxxxxx>: > On Tue, May 08, 2012 at 03:21:31PM +0800, Busby wrote: >> I have tested that the blocks were reused in the other thin-lun of >> this pool when deleted a thin-lun . >> How can the blocks allocated for the thin-lun be dynamically >> reclaimed? (use some method like 'discard' to tell the pool which >> block should be reclaimed and whether the pool can reclaim it ?). >> When I mounted a filesystem on a thin-lun, create 4G bytes file >> firstly, the pool have decreased 4G space, then I deleted the file, >> the pool did not increase the size as I thought, after this, create a >> 5G file, then the pool would decrease 1G size. So I think if the > > Have you enabled discard support in both the thin-pool _and_ the > filesystem? Have you confirmed that the filesystem issues the discard > in your test scenario? (eg, via blktrace). > > - Joe > > -- > dm-devel mailing list > dm-devel@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/dm-devel > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel