On Fri, February 27, 2009 6:12 am, PGNet wrote: > i've created an array, > > mdadm --create /dev/md5 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1 > > checking, > > cat /proc/mdstat > Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [linear] > md5 : active raid1 sda2[0] sdb2[1] > 341991616 blocks [2/2] [UU] > bitmap: 0/164 pages [0KB], 1024KB chunk > > i realized that it defaulted to metadata type = 0.90. > > is it possible to _modify_ this array to use "super 1.x" metadata > type, rather than the default 0.90? > > neither 'manage' or 'grow' modes seem to allow it, > > mdadm --manage --metadata=1.2 /dev/md5 > mdadm:option --metadata not valid in manage mode > mdadm --grow --metadata=1.2 /dev/md5 > mdadm:option --metadata not valid in grow mode Yes and no.... There is no way to have mdadm convert the metadata (yet, maybe one day. I accept patches). However the 1.0 metadata uses less space than the 0.90 metadata so it is fairly safe to simply stop the array and then create it with 1.0 metadata. All your data will still be there. The bitmap could get written at a different place, and could over-write data. So to be safe: mdadm -S /dev/md5 mdadm -C /dev/md5 -l1 -n2 -e 1.0 -z 341991616 /dev/sda2 /dev/sdb2 --assume-clean # make sure your data looks right mdadm --grow /dev/md5 --bitmap=internal Should be sufficient. BTW, I doubt that I'll ever support online metadata conversion. So the eventual command would be mdadm --assemble /dev/md5 --metadata=1.0 --update=metadata /dev/sd[ab]2 or something like that. 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
