Re: Where do I find the definitive man page for mdadm?

[Gene Heskett <gheskett@shentel.net>]

On Friday 12 November 2021 08:49:21 Dan Ritter wrote:

Ok, zeroed them, nuked mdadm.conf & rebooted.
gparted each one, setting 2 partitions in GPT format on each of 900000 
MIB (sde1) with label MDV1 and 5000 MIB (sde2) labeled MDV2 and applied 
that to each of the 4 drives. Double check as /dev/sdf somehow swapped 
positions on the drive, fixed that: Wash rinse and repeat for sdf, sdg, 
and sdh with labels of MDX1, MDX2, MDY1, MDY2 and MDZ1 and MDZ2. And of 
course gparted makes a file system when Apply is clicked.

but:
root@coyote:~$ 
mdadm -C /dev/md0 --level=10 --raid-devices=4 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1
mdadm: /dev/sde1 appears to contain an ext2fs file system
       size=921600000K  mtime=Wed Dec 31 19:00:00 1969
mdadm: /dev/sdf1 appears to contain an ext2fs file system
       size=921600000K  mtime=Wed Dec 31 19:00:00 1969
mdadm: /dev/sdg1 appears to contain an ext2fs file system
       size=921600000K  mtime=Wed Dec 31 19:00:00 1969
mdadm: /dev/sdh1 appears to contain an ext2fs file system
       size=921600000K  mtime=Wed Dec 31 19:00:00 1969
Continue creating array? yes
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
root@coyote:~$ 
mdadm -C /dev/md1 --level=10 --raid-devices=4 /dev/sde2 /dev/sdf2 /dev/sdg2 /dev/sdh2
mdadm: /dev/sde2 appears to contain an ext2fs file system
       size=51200000K  mtime=Wed Dec 31 19:00:00 1969
mdadm: /dev/sdf2 appears to contain an ext2fs file system
       size=51200000K  mtime=Wed Dec 31 19:00:00 1969
mdadm: /dev/sdg2 appears to contain an ext2fs file system
       size=51200000K  mtime=Wed Dec 31 19:00:00 1969
mdadm: /dev/sdh2 appears to contain an ext2fs file system
       size=51200000K  mtime=Wed Dec 31 19:00:00 1969
Continue creating array? yes
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md1 started.
root@coyote:~$ mkfs -Text4 /dev/md0
mke2fs 1.43.4 (31-Jan-2017)
mkfs.ext2: invalid blocks '/dev/md0' on device 'mkfs'

There are a few unallocated blocks at the ends of all drives. gparted 
chose alignment and prespace in MiB. Do I need to add a 3rd partition to 
use them up? All drives seem to be identical sizewise but the pages 
recommend identical partition sizes. Theoreticly I could expand the 
smaller partition to use it up.

rerunning gparted, I find 4 870 GIB partitions labeled coyote:0 and 4 47 
GiB paartitions all labeled coyote:1. Which isn't what I told gparted to 
label them as with about 3.5 GIB unallocated on each one.

So I am lost as to Whats next? Or do I start doing it all over again 
using some other partitioning tool?

Thanks all.

Cheers, Gene Heskett.
-- 
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