On Fri, 2 Sep 2011 01:54:49 +0100 Michael Busby <michael.a.busby@xxxxxxxxx> wrote: > As could not sleep, have just tested and works fine...here is what i have done > > sdd and sde are the 2 new disks > > mdadm -C /dev/md1 -l4 -n3 -e 1.0 /dev/sdd /dev/sde missing > > not sure if worth now using 1.2 as this seems the default setting if > not specified?? > > sdb and sdc are the old raid 5 disks > > echo frozen > /sys/block/md0/md/sync_action > mdadm /dev/md0 --add /dev/sdb > mdadm --grow --force /dev/md0 --raid-disks=4 > > echo frozen > /sys/block/md0/md/sync_action > mdadm /dev/md0 --add /dev/sdc > mdadm --grow --force /dev/md0 --raid-disks=5 You can do all this in one step - 3 to 5. > echo frozen > /sys/block/md0/md/sync_action > mdadm /dev/md0 --add /dev/sdb > mdadm /dev/md0 --add /dev/sdc > mdadm --grow --force /dev/md0 --raid-disks=5 NeilBrown > > echo raid0 > /sys/block/md0/md/level > > then resize the fs...job done :) > > > > On 2 September 2011 00:50, Michael Busby <michael.a.busby@xxxxxxxxx> wrote: > > Will test tomorrow once back in the office, hope the 4tb sync will be > > finished by then > > > > I will report back my findings > > > > > > > > -- Sent from my HP TouchPadOn 1 Sep 2011 11:34 PM, > > <john.robinson@xxxxxxxxxxxxxxxx> wrote: > > On 01/09/2011 22:50, Michael Busby wrote: > >> I have found the following and see that you can convert from raid4 to > >> raid0 fairly easy > >> > >> > >> http://ubuntuforums.org/showpost.php?p=10412231&postcount=20 > >> > >> i have a 2 disk raid5 and want to be able to convert this to raid0, i > >> was thinking of adding a extra 2 disk and setting them up as raid0, > >> moving the data over then adding the original raid5 disks to the raid0 > >> setup, but i see that you are unable to add disk to a raid0 setup, > >> would it be possible to setup a raid4 with 2 disks and 1 missing, move > >> the data from the raid5 to raid4 then add both of the original disks > >> to the raid4 the downgrade this to raid0??? > > > > Off the top of my head, feeling slightly sozzled (been for a few beers), > > this might work, but as your linked post referring to a list reply from > > Neil Brown says, you should test first. You could use some USB sticks, > > or alternatively loopback devices are ideal for this kind of test. > > > > Cheers, > > > > John. > > > -- > 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 -- 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
