Re: Switch raid mode without rebalance?

[Gert Menke <gert@menke.ac>]

Hi,

On 2016-08-26 13:52, Austin S. Hemmelgarn wrote:

> Regular 'df' isn't to be trusted when dealing with BTRFS, the only
> reason we report anything there is because many things break horribly
> if we don't.
Yeah, I noticed. Seems to produce a reasonable guess, though.

> Additionally, while running with multiple profiles while not balancing
> should work, it's pretty much untested, and any number of things may
> break.
Oh. Good to know.

> Assuming your two disks have similar latency and transfer
> speed, you're almost certainly better off just converting completely
> to single mode (which works like raid0, just at the chunk level
> instead of the block level).
Okay, I see.

> On a slightly separate note, if your doing backups more frequently
> than once a week, your probably better off just leaving the disks
> connected and running.  Regular load/unload cycles are generally
> harder on the mechanical components in modern disks than just leaving
> them running 24/7.
True. A bit of context: I first want to make a full backup locally, then 
use the disks off-site for nightly incremental backups via internet.

Cheers
Gert