Re: Still getting a lot of -28 (ENOSPC?) errors during balance

[Roman Mamedov <rm@romanrm.ru>]

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On Tue, 2 Apr 2013 14:04:52 +0600
Roman Mamedov <rm@romanrm.ru> wrote:

> With kernel 3.7.10 patched with "Btrfs: limit the global reserve to 512mb".
> (the problem was occuring also without this patch, but seemed to be even worse).
> 
> At the start of balance:
> 
> Data: total=31.85GB, used=9.96GB
> System: total=4.00MB, used=16.00KB
> Metadata: total=1.01GB, used=696.17MB
> 
> "btrfs balance start -musage=5 -dusage=5" is going on for about 50 minutes
> 
> Current situation:
> 
> Balance on '/mnt/r1/' is running
> 1 out of about 2 chunks balanced (20 considered),  50% left
> 
> Data: total=30.85GB, used=10.04GB
> System: total=4.00MB, used=16.00KB
> Metadata: total=1.01GB, used=851.69MB

About 2 hours 10 minutes into the balance, it was still going, with:

Data: total=30.85GB, used=10.06GB
System: total=4.00MB, used=16.00KB
Metadata: total=1.01GB, used=909.16MB

Stream of -28 errors continues non-stop in dmesg;

At ~2hr20min looks like it decided to allocate some more space for metadata:

Data: total=30.85GB, used=10.01GB
System: total=4.00MB, used=16.00KB
Metadata: total=2.01GB, used=748.56MB

And shortly after (~ 2hr25min) it was done. After the balance:

Data: total=29.85GB, used=10.01GB
System: total=4.00MB, used=16.00KB
Metadata: total=2.01GB, used=748.27MB

-- 
With respect,
Roman

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