Re: musical chairs

On Wed, 2004-09-22 at 15:00, dr_snafu wrote:

hello, 

i have a disk with data on it /dev/hdc, 
    and a brand new empty disk /dev/hdb. 

Partitions not in use?

want to set up raid 1 without moving data off hdc. 
    it very large and i have no where to put it

will this work?: (notice # of devices)

mdadm --create --verbose /dev/md0 --level=1 
        --raid-devices=1  /dev/hdb

Again, no partitions?  You can do that, don't get me wrong, but things
like raidautodetect work a bit more smoothly if you actually have a
partition table.

will this create an unmirrored raid 1 setup? 
    can i start and mount md0?
    then copy the data from hdb to md0?

then?:

mdadm /dev/md0 --add /dev/hdc


seems too good to be true, 
    maybe you know another way?

Use e2fsresize or whatever it's called to shrink the size of the e2fs on
/dev/hdc by 64k, then mdadm -C /dev/md0 -l raid1 -n 2 /dev/hdc failed,
then mdadm /dev/md0 -a /dev/hdb and all the data will then be synced
from hdc to hdb and when it's done the raid array will be up, running,
and fully operational.

-- 
  Doug Ledford [off-list ref]     919-754-3700 x44233
         Red Hat, Inc.
         1801 Varsity Dr.
         Raleigh, NC 27606