>>>>> "Wol" == Wol <antlists@xxxxxxxxxxxxxxx> writes: Wol> On 28/11/2021 20:15, John Stoffel wrote: >>>>>>> "Wol" == Wol <antlists@xxxxxxxxxxxxxxx> writes: >> Wol> Problem solved! My usual problem of missing the detail... >> >> How was the problem solved? Can you provide details on the before and >> after setup? It should be trivial to test with loop back devices. >> Wol> I'd described starting with a 2-drive mirror and converting it to Wol> a 3-drive raid-5. I was actually starting with a 2-active-1-spare Wol> mirror ... Wol> So I converted it to raid-5, and because there were only two active Wol> drives, it carried on running as a degraded two-drive raid-5. Wol> Once I brought the spare into service with --raid-devices=3, it started Wol> reshaping. Ah... that explains it. Wol> The website said to add the new drive and set raid-devices to three, I Wol> misread my own stuff and thought simply converting to raid-5 would bring Wol> in the spare. >> So if you had removed the spare before hand, would it have jumped >> straight to a three drive RAID 5 setup? Wol> No - because I didn't tell it to use all three drives. >> And curious why you didn't >> goto RAID6? RAID5 just makes me nervous these days, I don't trust it >> since drives tend to fail in waves. Wol> Well, with two DVD drives and a floppy in an old chassis, I've Wol> only got room for three drives. Well, there should be room for Wol> four, but my drives are a bit too fat ... :-) I understand. We all have to work within our limits. Wol> Plus (1) I've had no trouble so far with my drives (famous last words), Wol> (2) the drives are two new Ironwolves and an old Barracuda so I'm only Wol> likely to lose one so long as I keep an eye on things, and (3) all the Wol> drives have dm-integrity on them, so a corrupt drive should sort itself out. >> But in my home system, I also mostly just mirror (or even triple >> mirror!) my important data for both speed and ease of recovery. >> Wol> The trouble with a plain mirror is if your data is corrupted ... Wol> And if you've got raid you need to keep an eye on it. I'm planning to Wol> get an 8TB drive for backups ... probably configure it to snapshot once Wol> a week (I'm running lvm over raid over dm-integrity) and then use rsync Wol> to back up the volume over the network. Mind you I'm going to have to Wol> learn a lot of rsync - configure client/server and then get it to back Wol> up just the one file ... I've got an external USB-3 4tb drive I'm running rclone to, and planning on taking it to the bank one of these days when I remember to do so.
