On 19 February 2011 00:06, Jon Forrest <jlforrest@xxxxxxxxxxxx> wrote: > I'm just learning how the md system works so what > I'm going to say might not be sensible. > > I read that if a disk in a RAID5 set goes bad, and the > disk is replaced by a new one, that the recovery operation > takes place blindly. By this I mean that all the stripes > will be read so that new parity blocks can be written. > But, there might be stripes that contain only blocks > that aren't used by the filesystem. Wouldn't it be > good when doing recovery if some kind of allocation > map were created so that unused stripes wouldn't be > restored. I would think that depending on how full > the disk is that this could save time. > > Is this reasonable? > > Cordially, > -- > Jon Forrest > Research Computing Support > College of Chemistry > 173 Tan Hall > University of California Berkeley > Berkeley, CA > 94720-1460 > 510-643-1032 > jlforrest@xxxxxxxxxxxx > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at Âhttp://vger.kernel.org/majordomo-info.html > Isn't that what the bitmap is (partly) for? // Mathias -- 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
