Andrew Morton wrote (ao): > - Lots of MD and DM updates I would like to report that growing an online raid5 device works like a charm: mdadm --version mdadm - v2.4-pre1 - Not For Production Use - 20 March 2006 mdadm -C -l5 -n3 /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 While performing: for i in `seq 4` do dd if=/dev/zero of=bigfile.$i bs=1024k count=10000 done md5sum bigfile.* I do: mdadm /dev/md0 -a /dev/sdd1 mdadm --grow /dev/md0 --raid-disks=4 When the dd and md5sum finishes, I umount and: e2fsck -f /dev/md0 resize2fs -p /dev/md0 After mounting again the disk indeed is bigger, and the md5sum still matches. FWIW, I now try to add four more spares at once, and grow the raid5 again. It seems to work: # mdadm /dev/md0 -a /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 mdadm: added /dev/sde1 mdadm: added /dev/sdf1 mdadm: added /dev/sdg1 mdadm: added /dev/sdh1 # mdadm --grow /dev/md0 --raid-disks=8 mdadm: Need to backup 448K of critical section.. mdadm: ... critical section passed. # It is still reshapeing ATM. Thanks! Sander -- Humilis IT Services and Solutions http://www.humilis.net - 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