Bad Hammer zone statistics

Tomohiro Kusumi kusumi.tomohiro at gmail.com
Fri Jun 3 14:24:14 PDT 2016


Using a 5TB disk, I filled up the first layer1 (layer#0 for the first
4TB of the filesystem) to see if the statistics gets broken by a bug
of statistics itself.
As a result, it's not broken, so I guess your raid issue did break
your filesystem metadata.


[root@]~# df -T /HAMMER
Filesystem  Type   1K-blocks        Used     Avail Capacity  Mounted on
TEST        hammer 4881580032 4310634400 570945632    88%    /HAMMER
[root@]~# umount /HAMMER
[root@]~# hammer -vvf /dev/da4 blockmap > out
[root@]~# grep "layer1 " out -A 5
  layer1 4000000000000000 @2000000000800000 blocks-free 0
        4000000000000000 zone=4  vol=0   L1#=0      L2#=0      L1=0
   L2=0       app=8388608 free=0       fill=100.0
crc=9d65da9d-6663e9c8
        4000000000800000 zone=4  vol=0   L1#=0      L2#=1      L1=0
   L2=16      app=8388608 free=0       fill=100.0
crc=9d65da9d-6663e9c8
        4000000001000000 zone=4  vol=0   L1#=0      L2#=2      L1=0
   L2=32      app=8388608 free=0       fill=100.0
crc=9d65da9d-6663e9c8
        4000000001800000 zone=3  vol=0   L1#=0      L2#=3      L1=0
   L2=48      app=8388608 free=0       fill=100.0
crc=9d65da9d-12fb0047
        4000000002000000 zone=3  vol=0   L1#=0      L2#=4      L1=0
   L2=64      app=8388608 free=0       fill=100.0
crc=9d65da9d-12fb0047
--
  layer1 4000040000000000 @2000000001000000 blocks-free 69741
        4000040000000000 zone=10 vol=0   L1#=1      L2#=0      L1=32
   L2=0       app=8388608 free=0       fill=100.0
crc=5cccfffc-8f523ad6
        4000040000800000 zone=10 vol=0   L1#=1      L2#=1      L1=32
   L2=16      app=8388608 free=0       fill=100.0
crc=5cccfffc-8f523ad6
        4000040001000000 zone=10 vol=0   L1#=1      L2#=2      L1=32
   L2=32      app=8388608 free=0       fill=100.0
crc=5cccfffc-8f523ad6
        4000040001800000 zone=10 vol=0   L1#=1      L2#=3      L1=32
   L2=48      app=8388608 free=0       fill=100.0
crc=5cccfffc-8f523ad6
        4000040002000000 zone=10 vol=0   L1#=1      L2#=4      L1=32
   L2=64      app=8388608 free=0       fill=100.0
crc=5cccfffc-8f523ad6
[root@]~# tail -22 ./out
HAMMER zone statistics
        zone #  blocks       items              used[B]             used[%]
        zone 0  69741        0                  0                   0
        zone 1  0            0                  0                   0
        zone 2  0            0                  0                   0
        zone 3  128          0                  1073741824          100
        zone 4  3            0                  25165824            100
        zone 5  0            0                  0                   0
        zone 6  0            0                  0                   0
        zone 7  0            0                  0                   0
        zone 8  1075         0                  8795586560          97.5363
        zone 9  2            0                  5610928             33.4437
        zone 10 525078       0                  4404626128896       99.9989
        zone 11 0            0                  0                   0
        zone 12 0            0                  0                   0
        zone 13 0            0                  0                   0
        zone 14 0            0                  0                   0
        zone 15 452549       0                  3796256161792       100
        ----------------------------------------------------------------------
        total   1048576      0                  8210782395824       93.3458
0 bad layer1
0 bad layer2


2016-06-03 3:27 GMT+09:00 Tomohiro Kusumi <kusumi.tomohiro at gmail.com>:
> Your total block count matches your disk size (12TB),
> so it's either layer2's bytes_free field is broken or this statistics has a bug.
>
>
>> M block=200004b1f4800000 zone=11 calc 5386240 free, got 5470496
>>
>> BM block=200005e72e000000 zone=9  calc 5999696 free, got 5999824
>>
>> BM block=200006400c800000 zone=10 calc 7995392 free, got 8001360
>>
>> BM block=2000064225000000 zone=10 calc 8192000 free, got 8257536
>>
>> BM block=2000064225800000 zone=10 calc 8192000 free, got 8126464
>>
>> BM block=200006445d800000 zone=10 calc 8126464 free, got 8060928
>>
>> BM block=200006445f000000 zone=10 calc 8323072 free, got 8257536
>>
>> BM block=2000077674000000 zone=10 calc 6864896 free, got 7192576
>
> These errors come from the reason I mentioned above.
>
> Technically speaking, these offsets says the bad data are stored in
> the second layer1 entry, where 1 layer1 entry is 4TB.
> In other words these are beyond 4TB of the filesystem.
> I'll check if hammer blockmap/checkmap have a bug in this case
> tomorrow, before I say your metadata is broken.
>
>
> 2016-06-03 2:54 GMT+09:00 Antony T Curtis <atcurtis at gmail.com>:
>> Overall size of the disk is around 12 Tb.
>>
>> slightly different result from checkmap, likely because it is a mounted
>> volume...
>>
>>> M block=200004b1f4800000 zone=11 calc 5386240 free, got 5470496
>>>
>>> BM block=200005e72e000000 zone=9  calc 5999696 free, got 5999824
>>>
>>> BM block=200006400c800000 zone=10 calc 7995392 free, got 8001360
>>>
>>> BM block=2000064225000000 zone=10 calc 8192000 free, got 8257536
>>>
>>> BM block=2000064225800000 zone=10 calc 8192000 free, got 8126464
>>>
>>> BM block=200006445d800000 zone=10 calc 8126464 free, got 8060928
>>>
>>> BM block=200006445f000000 zone=10 calc 8323072 free, got 8257536
>>>
>>> BM block=2000077674000000 zone=10 calc 6864896 free, got 7192576
>>>
>>> HAMMER zone statistics
>>>
>>> zone #  blocks       items              used[B]             used[%]
>>>
>>> zone 0  0            0                  0                   0
>>>
>>> zone 1  0            0                  0                   0
>>>
>>> zone 2  0            0                  0                   0
>>>
>>> zone 3  128          0                  1073741824          100
>>>
>>> zone 4  4            0                  33554432            100
>>>
>>> zone 5  0            0                  0                   0
>>>
>>> zone 6  0            0                  0                   0
>>>
>>> zone 7  0            0                  0                   0
>>>
>>> zone 8  1029         0                  7988363264          92.5449
>>>
>>> zone 9  1443         0                  2183889824          18.0416
>>>
>>> zone 10 330736       0                  2911421278384       104.938
>>>
>>> zone 11 1154         0                  14288724672         147.604
>>>
>>> zone 12 0            0                  0                   0
>>>
>>> zone 13 0            0                  0                   0
>>>
>>> zone 14 0            0                  0                   0
>>>
>>> zone 15 0            0                  0                   0
>>>
>>> ----------------------------------------------------------------------
>>>
>>> total   334494       0                  2936989552400       104.67
>>>
>>> 0 bad nodes
>>>
>>> 8 errors
>>
>>
>>
>> On 2 June 2016 at 10:42, Tomohiro Kusumi <kusumi.tomohiro at gmail.com> wrote:
>>>
>>> 1. What's your approximate disk size (or sum of disks) ?
>>>
>>> 2. If your total block counts from blockmap output matches your disk size,
>>> > zone 0  1095221      0                  18446744073709486080 2.00784e+06
>>> this line from blockmap output shows your layer2 metadata probably had
>>> bad (broken) free_bytes.
>>> Can't tell how it was broken from this output though.
>>>
>>> 3. What are the 10 errors for checkmap ?
>>> You have output before statistics that indicates those errors.
>>>
>>>
>>> 2016-06-03 2:32 GMT+09:00 Antony T Curtis <atcurtis at gmail.com>:
>>> > Hammer checkmap shows this instead:
>>> >>
>>> >> HAMMER zone statistics
>>> >>
>>> >> zone #  blocks       items              used[B]             used[%]
>>> >>
>>> >> zone 0  0            0                  0                   0
>>> >>
>>> >> zone 1  0            0                  0                   0
>>> >>
>>> >> zone 2  0            0                  0                   0
>>> >>
>>> >> zone 3  128          0                  1073741824          100
>>> >>
>>> >> zone 4  4            0                  33554432            100
>>> >>
>>> >> zone 5  0            0                  0                   0
>>> >>
>>> >> zone 6  0            0                  0                   0
>>> >>
>>> >> zone 7  0            0                  0                   0
>>> >>
>>> >> zone 8  1029         0                  7988092928          92.5418
>>> >>
>>> >> zone 9  1443         0                  2183767648          18.0406
>>> >>
>>> >> zone 10 330734       0                  2911406172336       104.938
>>> >>
>>> >> zone 11 1154         0                  14287486768         147.591
>>> >>
>>> >> zone 12 0            0                  0                   0
>>> >>
>>> >> zone 13 0            0                  0                   0
>>> >>
>>> >> zone 14 0            0                  0                   0
>>> >>
>>> >> zone 15 0            0                  0                   0
>>> >>
>>> >> ----------------------------------------------------------------------
>>> >>
>>> >> total   334492       0                  2936972815936       104.67
>>> >>
>>> >> 0 bad nodes
>>> >>
>>> >> 10 errors
>>> >
>>> >
>>> >
>>> > On 2 June 2016 at 10:14, Antony T Curtis <atcurtis at gmail.com> wrote:
>>> >>
>>> >> This is from a hammer blockmap command.
>>> >>
>>> >> On 2 June 2016 at 10:13, Tomohiro Kusumi <kusumi.tomohiro at gmail.com>
>>> >> wrote:
>>> >>>
>>> >>> From which command is this from ?
>>> >>> It's not hammer show (because hammer show has non 0 items), so I
>>> >>> assume either blockmap or checkmap.
>>> >>>
>>> >>> 2016-06-03 2:05 GMT+09:00 Antony T Curtis <atcurtis at gmail.com>:
>>> >>> > Is there any info as to how to repair a Hammer volume or should I
>>> >>> > simply try
>>> >>> > to backup and restore?
>>> >>> >
>>> >>> >> HAMMER zone statistics
>>> >>> >>
>>> >>> >> zone #  blocks       items              used[B]             used[%]
>>> >>> >>
>>> >>> >> zone 0  1095221      0                  18446744073709486080
>>> >>> >> 2.00784e+06
>>> >>> >>
>>> >>> >> zone 1  0            0                  0                   0
>>> >>> >>
>>> >>> >> zone 2  0            0                  0                   0
>>> >>> >>
>>> >>> >> zone 3  128          0                  1073741824          100
>>> >>> >>
>>> >>> >> zone 4  4            0                  33554432            100
>>> >>> >>
>>> >>> >> zone 5  0            0                  0                   0
>>> >>> >>
>>> >>> >> zone 6  0            0                  0                   0
>>> >>> >>
>>> >>> >> zone 7  0            0                  0                   0
>>> >>> >>
>>> >>> >> zone 8  1029         0                  7986941952          92.5284
>>> >>> >>
>>> >>> >> zone 9  1443         0                  2183756816          18.0405
>>> >>> >>
>>> >>> >> zone 10 330680       0                  2910941826784       104.939
>>> >>> >>
>>> >>> >> zone 11 1154         0                  14287415824         147.59
>>> >>> >>
>>> >>> >> zone 12 0            0                  0                   0
>>> >>> >>
>>> >>> >> zone 13 0            0                  0                   0
>>> >>> >>
>>> >>> >> zone 14 0            0                  0                   0
>>> >>> >>
>>> >>> >> zone 15 143205       0                  1201290608640       100
>>> >>> >>
>>> >>> >>
>>> >>> >> ----------------------------------------------------------------------
>>> >>> >>
>>> >>> >> total   1572864      0                  4137797780736       31.3609
>>> >>> >>
>>> >>> >> 0 bad layer1
>>> >>> >>
>>> >>> >> 0 bad layer2
>>> >>> >
>>> >>> >
>>> >>> >
>>> >>> >
>>> >>> > --
>>> >>> > Antony T Curtis
>>> >>> >
>>> >>
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >> Antony T Curtis
>>> >> 0523 C487 9187 6972 6894
>>> >> AEC7 3087 F819 B477 B687
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> > Antony T Curtis
>>> > 0523 C487 9187 6972 6894
>>> > AEC7 3087 F819 B477 B687
>>
>>
>>
>>
>> --
>> Antony T Curtis
>> 0523 C487 9187 6972 6894
>> AEC7 3087 F819 B477 B687



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