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>
