On Wed, 29 Jun 2011 22:39:24 +0900 Namhyung Kim <namhyung@xxxxxxxxx> wrote: > NeilBrown <neilb@xxxxxxx> writes: > > > On Wed, 29 Jun 2011 11:32:55 +0100 (BST) Tom De Mulder <tdm27@xxxxxxxxx> > > wrote: > > > >> On Tue, 28 Jun 2011, Mathias Burén wrote: > >> > >> > IIRC md can already pass TRIM down, but I think the filesystem needs > >> > to know about the underlying architecture, or something, for TRIM to > >> > work in RAID. > >> > >> Yes, it's (usually/ideally) the filesystem's job to invoke the TRIM > >> command, and that's what ext4 can do. I have it working just fine on > >> single drives, but for reasons of service reliability would need to get > >> RAID to work. > >> > >> I tried (on an admittedly vanilla Ubuntu 2.6.38 kernel) the same on a two > >> drive RAID1 md and it definitely didn't work (the blocks didn't get marked > >> as unused and zeroed). > >> > >> > There's numerous discussions on this in the archives of > >> > this mailing list. > >> > >> Given how fast things move in the world of SSDs at the moment, I wanted to > >> check if any progress was made since. :-) I don't seem to be able to find > >> any reference to this in recent kernel source commits (but I'm a complete > >> amateur when it comes to git). > > > > > > Trim support for md is a long way down my list of interesting projects (and > > no-one else has volunteered). > > > > Just out of curiosity, what are there in your list? :) > > http://neil.brown.name/blog/20110216044002 I have code for the first - the bad block log - and it seems to work. But I really need to design and then perform some more testing. NeilBrown -- 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
