On 06/22/2015 10:53 PM, Moby wrote:
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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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
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