Re: Why is converting from RAID1 to single in Btrfs an I/O-intensive operation?

[Ferry Toth <fntoth@gmail.com>]

Op 18-02-2023 om 12:38 schreef Torsten Bronger:
> Hallöchen!
> 
> Goffredo Baroncelli writes:
> 
>> On 18/02/2023 09.10, Torsten Bronger wrote:
>>
>>
>>> I want to replace a device in a RAID1 and converted it
>>> temporarily to “single”:
>>
>> I suggest you to evaluate
>> - remove a disk when the FS is offline
>> - mount the FS in 'degraded' mode
>> - attach a new disk
Better (if you have the hardware for it, i.e. sufficient connectors) add 
the extra disk to the pool. Then remove the old disk from the pool.
Then physically remove the (now unused) disk.
> I agree that converting to single is not the fastest way to replace
> a disk, but the safest AFAICS.  It is the boot partition in a simple
> home server without monitor or keyboard, which makes mounting as
> degraded difficult.  Besides, you can only mount in degraded mode
> once.  If anything goes wrong, I have to rebuild from scratch.
> 
> Mileage may vary in a more professional environment.
> 
> Regards,
> Torsten.
>