On Tuesday May 2, a1426z@xxxxxxxxx wrote: > NeilBrown wrote: > > The "industry standard" DDF format allows for a stripe/offset layout > > where data is duplicated on different stripes. e.g. > > > > A B C D > > D A B C > > E F G H > > H E F G > > > > (columns are drives, rows are stripes, LETTERS are chunks of data). > > Presumably, this is the case for --layout=f2 ? Almost. mdadm doesn't support this layout yet. 'f2' is a similar layout, but the offset stripes are a lot further down the drives. It will possibly be called 'o2' or 'offset2'. > If so, would --layout=f4 result in a 4-mirror/striped array? o4 on a 4 drive array would be A B C D D A B C C D A B B C D A E F G H .... > > Also, would it be possible to have a staged write-back mechanism across > multiple stripes? What exactly would that mean? And what would be the advantage? 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
