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Re: cgd gives read-only error

Patrick Welche <> writes:

> On Thu, Jan 10, 2013 at 02:41:16AM +0000, Taylor R Campbell wrote:
>> If raid1 has partitions other than raid1a, then you presumably don't
>> want to overwrite the disklabel, so you'll probably want to skip the
>> first two sectors on disk, or use the start of the disk for a non-cgd
>> partition.  If you want cgd over all of raid1, then you can configure
>> cgd0 on raid1d instead of raid1a and it should all work.
> Good idea - use raid1d instead of raid1a. I just disklabel -W raid1
> (thank you Michael) and did the usual. You can get into the amusing
> situation where you can't write the disklabel on cgd0 because that
> would overwrite the disklabel on raid1a, yet a valid disklabel on
> cgd0 is the check for a valid passphrase (ie you even get surprised
> simply setting up a cgd regardless of "scrubbing")

It seems safest and least confusing to make a raid1a that starts at 64
(avoid anything not a reasonably large power of 2 due to larger physical
sectors) and make the cgd out of that.

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