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Linux 3.3 was supposed to have introduced support for re-striping between raid levels. Does anyone know how to go about doing so or know any good tutorials/documentation?
I'm thinking of getting a second drive, formatting it with btrfs, copying over my existing drive, and then adding the old drive and converting it to RAID1. If I can figure out how that is.
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You may need btrfs-progs-git installed (not sure, but the information in the man pages doesn't correspond to the ability of the applications either way), but you can change raid levels using:
btrfs filesystem balance start -dconvert=<raidlevel> -mconvert=<raidlevel>
Remember to add the extra disk/partition to the btrfs partition first with
btrfs device add /dev/sd** /path/to/mounted/btrfsfilesystem
Make sure to backup any important data first, I've only done this once myself (converting raid1 to non-raid, since syslinux can't boot a multiple device btrfs partition apparently (even if it is just raid1))
Sakura:-
Mobo: MSI MAG X570S TORPEDO MAX // Processor: AMD Ryzen 9 5950X @4.9GHz // GFX: AMD Radeon RX 5700 XT // RAM: 32GB (4x 8GB) Corsair DDR4 (@ 3000MHz) // Storage: 1x 3TB HDD, 6x 1TB SSD, 2x 120GB SSD, 1x 275GB M2 SSD
Making lemonade from lemons since 2015.
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Thanks WorMzy. I'll take the plunge and give it a try soon. I'm leaving a small ext2 boot partition for syslinux. Hopefully that will do the trick.
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I'm leaving a small ext2 boot partition for syslinux. Hopefully that will do the trick.
...why didn't I think of that? Thanks in return for that.
Sakura:-
Mobo: MSI MAG X570S TORPEDO MAX // Processor: AMD Ryzen 9 5950X @4.9GHz // GFX: AMD Radeon RX 5700 XT // RAM: 32GB (4x 8GB) Corsair DDR4 (@ 3000MHz) // Storage: 1x 3TB HDD, 6x 1TB SSD, 2x 120GB SSD, 1x 275GB M2 SSD
Making lemonade from lemons since 2015.
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*Shameless doublepost-bump*
If you got it working like that, mind letting me know how? Syslinux just seems to loop for me if /boot's on it's own partition. It doesn't even seem to attempt to load the kernel. Fortunately chainloading into grub still works, so I could boot my other installations and revert the changes, but I'd quite like to get this working.
Sakura:-
Mobo: MSI MAG X570S TORPEDO MAX // Processor: AMD Ryzen 9 5950X @4.9GHz // GFX: AMD Radeon RX 5700 XT // RAM: 32GB (4x 8GB) Corsair DDR4 (@ 3000MHz) // Storage: 1x 3TB HDD, 6x 1TB SSD, 2x 120GB SSD, 1x 275GB M2 SSD
Making lemonade from lemons since 2015.
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I am running a similar setup to your description. Yes, syslinux has a difficult time booting a raid1 btrfs array (it may be possible though?). I wound up giving up on syslinux and just using grub.
I left a small partition ext3 partition for grub on both my drives. grub-install <disk> works flawlessly this way. Technically, I dont think you need a dedicated /boot with grub now (as it now has full btrfs support?)
for both disks gdisk -l looks the same:
Number Start (sector) End (sector) Size Code Name
1 2048 6143 2.0 MiB EF02 BIOS boot partition
2 6144 1953523021 931.5 GiB 8300 Linux filesystem
I then created my btrfs raid1 array:
mkfs.btrfs -L TANK -d raid1 -m raid1 /dev/sda2 /dev/sdb2
grub-install went smoothly.
grub-install /dev/sda
grub-install /dev/sdb
grub-mkconfig -o /boot/grub/grub.cfg
MAKE sure you add the "btrfs" hook mkinitcpio to mkinitcpio.conf hooks array and regen your initramfs-linux.img. Somehow I forget to do this sometimes...
The resulting setup can be booted even if one drive fails (in degraded mode atleast). If a drive were to fail, its a little bit of a pain to setup the partitions on the failed drive replacement, add the device to the degraded btrfs, and install grub to it... but hey. Its relatively bullet proof: even more so with weekly snapshots and backups to a non-btrfs device.
Anyway I am really enjoying the btrfs features! good luck with the install.
Last edited by cteampride (2012-05-20 01:10:35)
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