BTRFS & LVM

Hi mdgm

mdgm wrote:
What kind of RAID-0 volume would you want? A separate one for each disk?

No, no. I'm not sure, but can't btrfs use logical partitions for building a raid? For example, use sda2 + sdb2 + sdc2 to build a raid-n?

mdgm wrote:
Swapping disks out isn't meant for backups. It's meant for replacing a dead disk or a disk you no longer wish to use (with a higher capacity one).

yes, eactly. Every time when expanding my NAS's (all bays filled), I'll have the problem, that I have to complete restore them from Backup.
With Btrfs it would be possible to empty one of the disk ( there must be enough space left on the Raid), take it out of the raid, and mount a bigger one to it.

mdgm wrote:
I think you meant md raid not LVM RAID. We are not using LVM. OS4 used EXT4 on top of LVM on top of md raid. Now we use BTRFS on md raid.

This may be, I'm not that "linux expert". ;-)

mdgm wrote:
While the BTRFS filesystem is stable, BTRFS level RAID is still quite experimental (especially RAID5 and RAID6) in my personal view and I would not trust it. Whereas md raid has been around for over a decade and is very mature.

yes, I heard about it. But may be, it will become stable some time.
And because I'm not using raid >0 (didn't need to ensure 100% data access) raid 0 would be quite fine for me... :-)
(okay, yes, there may exist some other users, which have to rely on Raid5/6)

mdgm wrote:
As for what we will do in the future you will have to wait and see.

[/quote]
That's right, may be next week .... ;-)

Regards