Re: Where do I find the definitive man page for mdadm?
On Friday 12 November 2021 11:49:29 The Wanderer wrote:
> On 2021-11-12 at 11:42, Gene Heskett wrote:
> > On Friday 12 November 2021 10:18:07 Dan Ritter wrote:
> >> Gene Heskett wrote:
> >> > 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
> >
> > That doesn't appear to be true. I have run the create which seemed
> > to be ok, then mkfs -text4 /dev/md0, then mounted it at /home2.
> >
> > But /etc/mdadm/mdadm.conf doesn't yet have any of that, only this:
>
> <snip>
>
> > Which from your descriptions is not complete. No ARRAY statements at
> > all. What did I do wrong?
>
> Not sure if you did anything wrong, but now that you've done the
> --create operation, you might try running
>
> # mdadm --detail --scan
>
> again. You might see that it now outputs definition lines like the
> ones Dan presented as examples; if so, you can append those lines to
> mdadm.conf, and if I'm not mistaken the result should (in theory) be
> valid.
>
> > And again, I don't trust UUID's as moving a drive cable to a
> > different socket has invalidated the whole lot of them once before.
>
> Eh? That doesn't make any sense at all. The UUID is supposed to be
> stored *on* the drive, so that it is independent of connection. I can
> testify that this has been the case in my experience with mdadm
> RAID-array UUIDs.
Does re-running blockid rewrite those?
I recall I did that when the moved cable didn't mount on reboot.
Cheers, Gene Heskett.
--
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