Re: Where do I find the definitive man page for mdadm?
Gene Heskett wrote:
> 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
You should stop there and run wipefs. I note from later mail in
this thread that you didn't; and then you had to reboot.
With the array not started, or stopped, run wipefs on each of
the partitions.
Then these -C commands should work well without warnings, and
creating a filesystem on the /dev/mdX devices will proceed
without warnings or errors.
> 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.
I would not bother.
-dsr-
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