I'd personally use the raid as the backing device but any would work - you would have duplicates ending up in the cache if you cached the hard drives directly. On Mon, Feb 6, 2012 at 10:56 AM, Piergiorgio Sartor <piergiorgio.sartor@xxxxxxxx> wrote: > Hi all again, > > I'm not sure if the topic was already discussed here, > anyway I'll go ahead, sorry if it is a duplication. > > I was wondering, in case of layered devices, what would > be the best layer to use as backing device. > > Specifically, I've two HDDs in RAID10 (Linux md driver, > software RAID), on top of the RAID there are LV partitions. > > Obviously, it would be possible to use the RAID components, > i.e. the HDDs as backing devices, or the RAID itself, or > the LV partitions (/dev/mapper/VolXXX). > > My guess would be to use the LV partitions, since these > are closer to the filesystem, but, maybe, using the RAID > or even the single HDDs could be better. > > Any idea on the topic? Suggestions & motivations? > > Thanks a lot in advance, > > bye, > > -- > > piergiorgio > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
