On Thu, 2006-04-20 at 17:22 +0200, Gabor Gombas wrote: > On Wed, Apr 19, 2006 at 02:16:10PM -0400, Ming Zhang wrote: > > > is this possible? > > * stop RAID5 > > * set a mirror between current disk X and a new added disk Y, and X as > > primary one (which means copy X to Y to full sync, and before this ends, > > only read from X); also this mirror will not have any metadata or mark > > on existing disk; > > The mirror should be created without persistent superblocks (obviously), > but --build does not seem to allow RAID1. > > > * add this mirror to RAID5 > > * start RAID5; > > > > ... mirror will continue copy data from X to Y, once end > > > > * stop RAID5 > > * split mirror > > * put DISK Y back to RAID5 > > * restart RAID5. > > > > since this is a mirror, all metadata are same. it will be even greater > > if no need to stop raid5 to do this. > > The process seems rather fragile. If I created a RAID5 array to protect > my data I most certainly would not like to perform so much steps where I > can mess up. it can be be script and then little chance to get failed. or if i understand current raid5 bitmap right. u can remove the disk X from raid, then do a dd from disk X to Y, and then add disk Y to raid. then bitmap can handle the rsync with a much less cost. > > Gabor > - 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
