On Fri, Nov 12, 2021 at 09:48:01AM -0500, 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. > > > It is in that man page, as an example under --detail. > > 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. > > > > But I don't see an option (or recognize it if it is there) to give > > > it a controller id and let it make a raid10 out of the 4 identical > > > drives it could find there. > > > > > > If there is such a critter, point me at it please. > > > > You have to feed mdadm the drives you want specifically; there's > > no scattershot approach. > > > > Let's say that the drives are /dev/sdf, /dev/sdg, /dev/sdh and > > /dev/sdi. > > > > (You can re-confirm what drive is what via hdparm -i, or > > smartctl.) > > > > If you have data on them, it will be wiped out. You should copy > > off anything important, and then run wipefs on each of them. > > > > Then, creation is > > > > # mdadm -C /dev/md0 --level=10 --raid-devices=4 /dev/sdf /dev/sdg > > /dev/sdh /dev/sdi > > > > (assuming you want it named /dev/md0 and there isn't one > > already) > > > > Then you can make a filesystem on /dev/md0 and put it in your > > fstab, mount it, and copy data over to it. > > So mkfs.ext4 /md0 is required, ok > > > > What I'd like to do when I install bullseye, is use this raid10 for > > > the /home partition in the bullseye install. > > > > The installer will recognize it as an md RAID and can be told that you > > want to use it as-is, or you can destroy it and re-create it without > > data. > > > > -dsr- > Thanks Dan. > > 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> >
Gene At the point when you want to install Bullseye: Use an expert install. set up the disks as RAID 10 first, then use the partition editor to assign the RAID as /home At that point, you're done :) All the very best, as ever, Andy C.
