BTRFS balance fails with -dusage=100

DISCUSSION Moby 1 participant 3 messages Jun 23, 2015 – Jun 25, 2015 Btrfs file system

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Moby

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2015-06-23 03:54 UTC #0 lore raw

OpenSuSE 13.2 system with single BTRFS / mounted on top of /dev/md1. /dev/md1 is md raid5 across 4 SATA disks.

System details are:

Linux suse132 4.0.5-4.g56152db-default #1 SMP Thu Jun 18 15:11:06 UTC 2015 (56152db) x86_64 x86_64 x86_64 GNU/Linux

btrfs-progs v4.1+20150622

Label: none uuid: 33b98d97-606b-4968-a266-24a48a9fe50d
Total devices 1 FS bytes used 884.21GiB
devid 1 size 1.36TiB used 889.06GiB path /dev/md1

Data, single: total=885.00GiB, used=883.12GiB System, DUP: total=32.00MiB, used=144.00KiB Metadata, DUP: total=2.00GiB, used=1.09GiB GlobalReserve, single: total=384.00MiB, used=0.00B

Relevant entries from log are:

2015-06-22T22:46:32.238011-05:00 suse132 kernel: [90193.446128] BTRFS: bdev /dev/md1 errs: wr 9977, rd 0, flush 0, corrupt 0, gen 0
2015-06-22T22:46:32.238050-05:00 suse132 kernel: [90193.446158] BTRFS: bdev /dev/md1 errs: wr 9978, rd 0, flush 0, corrupt 0, gen 0
2015-06-22T22:46:32.238054-05:00 suse132 kernel: [90193.446179] BTRFS: bdev /dev/md1 errs: wr 9979, rd 0, flush 0, corrupt 0, gen 0

System was (still is - other than btrfs balance) running fine. Then I did massive data I/O, copying and deleting and massive amounts of data to bring the system into it's present state. Once I was done with the I/O, kicked off btrfs balance start /. Above command failed. Then I started doing btrfs balance -dusage=XX /
This command succeeds with XX upto and including 99. It fails when I set XX to 100. btrfs balance also fails if I omit the -dusage option.
The errors in the log make no sense to me since the md raid device is not reporting any errors at all. Also running btrfs scrub reports no errors at all.

Any ideas on how to get btrfs balance to succeed without errors would be welcome.

Regards,

--Moby
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Moby

author

2015-06-24 17:34 UTC #1 lore raw

Quoted 29 lines · Moby

OpenSuSE 13.2 system with single BTRFS / mounted on top of /dev/md1. /dev/md1 is md raid5 across 4 SATA disks.
System details are:
Linux suse132 4.0.5-4.g56152db-default #1 SMP Thu Jun 18 15:11:06 UTC 2015 (56152db) x86_64 x86_64 x86_64 GNU/Linux
btrfs-progs v4.1+20150622
Label: none uuid: 33b98d97-606b-4968-a266-24a48a9fe50d
Total devices 1 FS bytes used 884.21GiB
devid 1 size 1.36TiB used 889.06GiB path /dev/md1
Data, single: total=885.00GiB, used=883.12GiB System, DUP: total=32.00MiB, used=144.00KiB Metadata, DUP: total=2.00GiB, used=1.09GiB GlobalReserve, single: total=384.00MiB, used=0.00B
Relevant entries from log are:
2015-06-22T22:46:32.238011-05:00 suse132 kernel: [90193.446128] BTRFS: bdev /dev/md1 errs: wr 9977, rd 0, flush 0, corrupt 0, gen 0
2015-06-22T22:46:32.238050-05:00 suse132 kernel: [90193.446158] BTRFS: bdev /dev/md1 errs: wr 9978, rd 0, flush 0, corrupt 0, gen 0
2015-06-22T22:46:32.238054-05:00 suse132 kernel: [90193.446179] BTRFS: bdev /dev/md1 errs: wr 9979, rd 0, flush 0, corrupt 0, gen 0
System was (still is - other than btrfs balance) running fine. Then I did massive data I/O, copying and deleting and massive amounts of data to bring the system into it's present state. Once I was done with the I/O, kicked off btrfs balance start /. Above command failed. Then I started doing btrfs balance -dusage=XX /
This command succeeds with XX upto and including 99. It fails when I set XX to 100. btrfs balance also fails if I omit the -dusage option.
The errors in the log make no sense to me since the md raid device is not reporting any errors at all. Also running btrfs scrub reports no errors at all.

Quoted 9 lines

Any ideas on how to get btrfs balance to succeed without errors would be welcome.
Regards,
--Moby
Signature · 1 line
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in

On another run with -duage=95, I am now seeing the following (negative percentage left value!)

Every 15.0s: sh -c date;btrfs balance status -v / Wed Jun 24 12:29:12 2015

Wed Jun 24 12:29:12 CDT 2015
Balance on '/' is running
306 out of about 145 chunks balanced (312 considered), -111% left Dumping filters: flags 0x1, state 0x1, force is off
DATA (flags 0x2): balancing, usage=95

--Moby

Moby

author

2015-06-25 14:41 UTC #2 lore raw

Quoted 46 lines · Moby

Quoted 29 lines · Moby
OpenSuSE 13.2 system with single BTRFS / mounted on top of /dev/md1. /dev/md1 is md raid5 across 4 SATA disks.
System details are:
Linux suse132 4.0.5-4.g56152db-default #1 SMP Thu Jun 18 15:11:06 UTC 2015 (56152db) x86_64 x86_64 x86_64 GNU/Linux
btrfs-progs v4.1+20150622
Label: none uuid: 33b98d97-606b-4968-a266-24a48a9fe50d
Total devices 1 FS bytes used 884.21GiB
devid 1 size 1.36TiB used 889.06GiB path /dev/md1
Data, single: total=885.00GiB, used=883.12GiB System, DUP: total=32.00MiB, used=144.00KiB Metadata, DUP: total=2.00GiB, used=1.09GiB GlobalReserve, single: total=384.00MiB, used=0.00B
Relevant entries from log are:
2015-06-22T22:46:32.238011-05:00 suse132 kernel: [90193.446128] BTRFS: bdev /dev/md1 errs: wr 9977, rd 0, flush 0, corrupt 0, gen 0
2015-06-22T22:46:32.238050-05:00 suse132 kernel: [90193.446158] BTRFS: bdev /dev/md1 errs: wr 9978, rd 0, flush 0, corrupt 0, gen 0
2015-06-22T22:46:32.238054-05:00 suse132 kernel: [90193.446179] BTRFS: bdev /dev/md1 errs: wr 9979, rd 0, flush 0, corrupt 0, gen 0
System was (still is - other than btrfs balance) running fine. Then I did massive data I/O, copying and deleting and massive amounts of data to bring the system into it's present state. Once I was done with the I/O, kicked off btrfs balance start /. Above command failed. Then I started doing btrfs balance -dusage=XX /
This command succeeds with XX upto and including 99. It fails when I set XX to 100. btrfs balance also fails if I omit the -dusage option.
The errors in the log make no sense to me since the md raid device is not reporting any errors at all. Also running btrfs scrub reports no errors at all.
Quoted 9 lines
Any ideas on how to get btrfs balance to succeed without errors would be welcome.
Regards,
--Moby
Signature · 1 line
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
On another run with -duage=95, I am now seeing the following (negative percentage left value!)
Every 15.0s: sh -c date;btrfs balance status -v / Wed Jun 24 12:29:12 2015

Quoted 13 lines

Wed Jun 24 12:29:12 CDT 2015
Balance on '/' is running
306 out of about 145 chunks balanced (312 considered), -111% left Dumping filters: flags 0x1, state 0x1, force is off
DATA (flags 0x2): balancing, usage=95
--Moby
Signature · 3 lines
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Upgrading to kernel 4.1.0-1.gfcf8349-default and btrfs-progs v4.1+20150622 seems to have fixed the problem. btrfs balance now completes without any errors.

Signature · 3 lines

--Moby

They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.  -- Benjamin Franklin