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. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>
