On 28 June 2011 16:31, Tom De Mulder <tdm27@xxxxxxxxx> wrote: > Hi, > > > I'm investigating SSD performance on Linux, in particular for RAID devices. > > As I understand it—and please correct me if I'm wrong—currently software > RAID does not pass through TRIM to the underlying devices. TRIM is essential > for the continued high performance of SSDs, which otherwise degrade over > time. > > I don't think there would be any harm in this command being passed through > to underlying devices if they don't support it (they would just ignore it), > and if they do it would make high-performance software RAID of SSDs a > possibility. > > > Is this something that's in the works? > > > > Many thanks, > > -- > Tom De Mulder <tdm27@xxxxxxxxx> - Cambridge University Computing Service > +44 1223 3 31843 - New Museums Site, Pembroke Street, Cambridge CB2 3QH > -> 28/06/2011 : The Moon is Waning Crescent (22% of Full) 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. There's numerous discussions on this in the archives of this mailing list. /M -- 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
