On 02/03/2017 06:30 PM, Jorg Bornschein wrote:
> February 3, 2017 11:26 PM, "Goldwyn Rodrigues" <rgold...@suse.com> wrote:
> 
>>> Hi,
>>>
>>> I'm currently running a balance (without any filters) on a 4 drives raid1 
>>> filesystem. The array
>>> contains 3 3TB drives and one 6TB drive; I'm running the rebalance because 
>>> the 6TB drive recently
>>> replaced a 2TB drive.
>>>
>>> I know that balance is not supposed to be a fast operation, but this one is 
>>> now running for ~6 days
>>> and it managed to balance ~18% (754 out of about 4250 chunks balanced (755 
>>> considered), 82% left)
>>> -- so I expect it to take another ~4 weeks.
>>>
>>> That seems excessively slow for ~8TiB of data.
>>>
>>> Is this expected behavior? In case it's not: Is there anything I can do to 
>>> help debug it?
>>
>> Do you have quotas enabled?
> 
> 
> I might have activated it when playing with "snapper" -- I remember using 
> some quota command without knowing what it does. 
> 
> How can I check its active? Shall I just disable it wit "btrfs quota 
> disable"? 
> 

To check your quota limits:
# btrfs qgroup show <mountpoint>

To disable
# btrfs quota disable <mountpoint>

Yes, please check if disabling quotas makes a difference in execution
time of btrfs balance.

-- 
Goldwyn
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