if you mean BTRFS RAID than yes.
BTRFS have built in RAID functionality a direct replacement for Linux MD RAID and LVM
you can create a BTRFS Volume spanning multiple devices in Raid 1/10/5/6 configuration. you can even have no RAID multi device spanned volume aka LVM style.
best part , you can add device on the fly without stopping the system (providing you have hot-plug support on a hardware)
I had setup my test server(work in progress hence the test part)
using OpenSusy 13.1 using BTRFS /root on 1TB HDD as system drive
after all install and update I added second 1TB HDD and expand the volume to it
rebalanced/convert to RAID 1 setup (not 100% though as I am not sure how to setup grub to boot from either HDD, but it should be possible or so I have heard)
it did all that on a running system. I did not have to reboot or even log-off.
I was using the system the whole time doing other things like web surfing
and setting up my second NIC.
To make sure I am understanding this correctly. If I setup a Volume over 5-6 disks using a JBOD/LVM type setup then when their Raid5 becomes stable, I could theoretically rebalance/convert to Raid5?
And to clarify/expand on my last question. If I already have a Raid5 volume with 5 disks and let's say I want to add another 1, I could do that unlike ZFS or conventional Raid5?
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