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

[Dan Ritter <dsr@randomstring.org>]

Gene Heskett wrote: 
> On Friday 12 November 2021 08:49:21 Dan Ritter wrote:
> 
> > Gene Heskett wrote:
> > > The man page we have goes on and on for megabytes without ever
> > > giving an example.
> > >
> > > I thought maybe it could scan for devices so that I could build an
> > > mdadm.conf but it wont do a --scan by itself.
> >
> > You are looking for
> >
> > mdadm --detail  --scan
> >
> Null return on stretch version of mdadm. Supposedly up to date as of an 
> hour ago.

That would be expected if you don't have any current mdadm
devices.


> Not in the stretch man page.  And its sounding as if I should do that 
> during the bullseye install to get the more capable mdadm, but will the 
> devices have the same names? With the reputation for volatility of 
> device names a mistake there could destroy 23 years of data.

After you have set them up, mdadm.conf has things like this:

ARRAY /dev/md/0 metadata=1.2 name=debian:0 UUID=aeac6271:676b1852:04f077d6:fcd285d6
ARRAY /dev/md/1 metadata=1.2 name=debian:1 UUID=d74ff881:2e966c37:ec6ef1ec:75b8cdce
ARRAY /dev/md/2 metadata=1.2 name=debian:2 UUID=7c56166b:0d5aed8b:a9d03c45:e9b8080c

And during boot, the system will look for all drives/partitions that fit
that UUID for assembly, regardless of whether they are currently
named /dev/hdc3,  /dev/sdq, or /dev/nvme0np1.

-dsr-