Bug 120121 - Balance fails with unallocated diskspace
Summary: Balance fails with unallocated diskspace
Status: NEW
Alias: None
Product: File System
Classification: Unclassified
Component: btrfs (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Josef Bacik
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-06-13 14:55 UTC by NisseK
Modified: 2016-09-19 16:43 UTC (History)
1 user (show)

See Also:
Kernel Version: 4.2.0-36-generic
Subsystem:
Regression: No
Bisected commit-id:

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Description NisseK 2016-06-13 14:55:51 UTC 
I tried to migrate from raid1 to raid10  (btrfs balance start /files -mconvert=raid10 -dconvert=raid10)

This failed after about 1TB with enosp errors.

I have since then managed to migrate all metadata back to raid1 but my data is still a mix.

I've tried "balance -dusage=50" with all values from 0 to 100, also with -dprofiles=raid1 and -dprofiles=raid10. I've also tried balance -dconvert=raid1 (with and without -dprofiles=raid10) but I always get enosp errors.
I've also added a small usb-drive(/dev/sdh below) to get some space but it still gives the same error.

Since I have about 1.5TB unallocated space it's my understanding that this shouldn't be a problem, or am I completely wrong?

The output from btrfs filesystem usage /files

Overall:
    Device size:		  18.20TiB
    Device allocated:		  16.67TiB
    Device unallocated:		   1.53TiB
    Device missing:		     0.00B
    Used:			  16.67TiB
    Free (estimated):		 781.62GiB	(min: 781.62GiB)
    Data ratio:			      2.00
    Metadata ratio:		      2.00
    Global reserve:		 512.00MiB	(used: 0.00B)

Data,RAID1: Size:7.21TiB, Used:7.21TiB
   /dev/sdb	   3.23TiB
   /dev/sdc	   3.24TiB
   /dev/sdd	   1.89TiB
   /dev/sde	   2.32TiB
   /dev/sdf	   1.42TiB
   /dev/sdg	   2.33TiB

Data,RAID10: Size:1.11TiB, Used:1.11TiB
   /dev/sdb	 190.05GiB
   /dev/sdc	 189.34GiB
   /dev/sdd	 190.05GiB
   /dev/sde	 190.05GiB
   /dev/sdf	 188.92GiB
   /dev/sdg	 189.41GiB
   /dev/sdh	   2.48GiB

Metadata,RAID1: Size:10.19GiB, Used:9.35GiB
   /dev/sdb	   4.47GiB
   /dev/sdc	   3.58GiB
   /dev/sdd	   5.19GiB
   /dev/sde	   3.07GiB
   /dev/sdf	   1.34GiB
   /dev/sdg	   2.72GiB

System,RAID1: Size:32.00MiB, Used:1.41MiB
   /dev/sdc	  32.00MiB
   /dev/sdd	  32.00MiB

Unallocated:
   /dev/sdb	 222.50GiB
   /dev/sdc	 219.07GiB
   /dev/sdd	   1.56TiB
   /dev/sde	 221.40GiB
   /dev/sdf	 219.75GiB
   /dev/sdg	 219.39GiB
   /dev/sdh	   4.97GiB
Comment 1 NisseK 2016-09-19 16:43:49 UTC 
I've no replaced one of my old disks and started rebalancing the pool, the last state I saw before the problem was 3% left of balancing. Next time I checked it had failed due to enospc errors. Now on kernel 4.4.0-36-generic
Overall:               
	Device size:                  23.65TiB          
	Device allocated:             18.37TiB         
	Device unallocated:            5.28TiB           
	Device missing:                  0.00B         
	Used:                         18.36TiB          
	Free (estimated):              2.64TiB      (min: 2.64TiB)     
	Data ratio:                       2.00                          
	Metadata ratio:                   2.00                         
	Global reserve:              512.00MiB      (used: 0.00B) 
	 
Data,RAID1: Size:9.17TiB, Used:9.17TiB                             
	/dev/sdb        2.74TiB                                            
	/dev/sdc        2.75TiB                                        
	/dev/sdd        6.38TiB                                 
	/dev/sde        1.84TiB                                    
	/dev/sdf        1.84TiB                                           
	/dev/sdg        2.80TiB
	 
Metadata,RAID1: Size:11.96GiB, Used:10.37GiB                        
	/dev/sdb        3.99GiB                                                  
	/dev/sdc        1.00GiB                                                  
	/dev/sdd       11.96GiB                                                   
	/dev/sde        1.00GiB                                                  
	/dev/sdf      992.00MiB                                                  
	/dev/sdg        5.00GiB    
	 
 System,RAID1: Size:32.00MiB, Used:1.28MiB                            
	/dev/sdd       32.00MiB                                    
	/dev/sdg       32.00MiB   
	 
Unallocated:                                               
	/dev/sdb      911.06GiB                                    
	/dev/sdc      911.02GiB                     
	/dev/sdd      911.09GiB                      
	/dev/sde      910.52GiB                      
	/dev/sdf      910.57GiB                     
	/dev/sdg      856.99GiB
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