On Fri, 29 Apr 2016, Benton Lam <[email protected]> wrote: > Hi, > > I currently have a 5.7 box, with 2 disk RAID1 (comprise of sd1a and sd2a) > > Suppose I upgrade / install to 5.9. Is it possible for me to do the following: > > bioctl -O /dev/sd2a sd3 # degrade the raid1 (sd3) > bioctl -c 5 -l /dev/sd1a,/dev/sd2a,/dev/sd4a -O /dev/sd1a softraid0 # > create a raid 5 with sd1a, sd2a and sd4a, but sd1a is degraded, > suppose that creates sd5 > > <copy stuff from RAID1 to RAID5> > bioctl -d sd3 > bioctl -R /dev/sd1a sd5 # swap the sd1a back into the raid5 > > Is that possible? or should I be finding another 3TB drive, copy the > stuff onto that temporary drive and create the RAID5? > > Thanks, > Benton Lam
1. Try it in Qemu. Really, nothing like a playground where you can try things without unnecessary risk. I run my lab like this: > #!/bin/sh > exec qemu-system-x86_64 -m 512 -no-fd-bootchk \ > -device virtio-net,netdev=mynet0 -netdev user,id=mynet0 \ > -cpu host -enable-kvm \ > -serial mon:stdio \ > -drive if=virtio,index=0,file=$HOME/vm/raidlab-0.img \ > -drive if=virtio,index=1,file=$HOME/vm/raidlab-1.img \ > -drive if=virtio,index=2,file=$HOME/vm/raidlab-2.img \ > ... [ continue adding drives here ] ... \ > -cdrom ~/iso/OpenBSD/amd64/install59.iso \ > $@ To get more disks, dd if=/dev/zero of=raidlab-$i.img bs=1M count=1024 The host is on Linux, but I think you only need to drop the kvm flag for other host OS's to work. You need -boot d to start from CD, and -nographic to use your terminal as the console after installation. You may also want to add: /etc/boot.conf: > set tty com0 > stty com0 115200 /etc/ttys: > tty00 "/usr/libexec/getty std.115200" vt220 on secure 2. For live data, if you care about it at all, this sounds like a really bad idea. Ensure you have good backups before you do anything destructive. Consider whether another drive's cost really means more to you than your data. You can keep the extra drives as spares for later. Better safe than sorry. K.
