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Re: suddenly slow writes on XFS Filesystem

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: suddenly slow writes on XFS Filesystem
From: Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx>
Date: Mon, 07 May 2012 09:22:42 +0200
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, stan@xxxxxxxxxxxxxxxxx, Martin@xxxxxxxxxxxx
In-reply-to: <20120507071713.GZ5091@dastard>
References: <4FA63DDA.9070707@xxxxxxxxxxxx> <20120507013456.GW5091@dastard> <4FA76E11.1070708@xxxxxxxxxxxx> <20120507071713.GZ5091@dastard>
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.28) Gecko/20120313 Thunderbird/3.1.20
>> # vmstat
> "vmstat 5", not vmstat 5 times....  :/
oh sorry. Sadly the rsync processes do not run right know i've to kill
them. Is the output still usable?
# vmstat 5
procs -----------memory---------- ---swap-- -----io---- -system--
----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy
id wa
 0  1      0 5582136     48 5849956    0    0   176   394   34   54  1
16 82  1
 0  1      0 5552180     48 5854280    0    0  2493  2496 3079 2172  1
4 86  9
 3  2      0 5601308     48 5857672    0    0  1098 28043 5150 1913  0
10 73 17
 0  2      0 5595360     48 5863180    0    0  1098 14336 3945 1897  0
8 69 22
 3  2      0 5594088     48 5865280    0    0   432 15897 4209 2366  0
8 71 21
 0  2      0 5591068     48 5868940    0    0   854 10989 3519 2107  0
7 70 23
 1  1      0 5592004     48 5869872    0    0   180  7886 3605 2436  0
3 76 22

>> /dev/sdb1             4,6T  4,3T  310G  94% /mnt
> Well, you've probably badly fragmented the free space you have. what
> does the 'xfs_db -r -c freesp <dev>' command tell you?

   from      to extents  blocks    pct
      1       1  942737  942737   0,87
      2       3  671860 1590480   1,47
      4       7  461268 2416025   2,23
      8      15 1350517 18043063  16,67
     16      31  111254 2547581   2,35
     32      63  192032 9039799   8,35
     64     127   33026 3317194   3,07
    128     255   14254 2665812   2,46
    256     511   12516 4631200   4,28
    512    1023    6942 5031081   4,65
   1024    2047    4622 6893270   6,37
   2048    4095    3268 9412271   8,70
   4096    8191    2135 12716435  11,75
   8192   16383     338 3974884   3,67
  16384   32767     311 7018658   6,49
  32768   65535     105 4511372   4,17
  65536  131071      29 2577756   2,38
 131072  262143       8 1339796   1,24
 262144  524287      10 3950416   3,65
 524288 1048575       4 2580085   2,38
1048576 2097151       2 3028028   2,80

>>>> #~ df -i
>>>> /dev/sdb1            4875737052 4659318044 216419008  96% /mnt
>>> You have 4.6 *billion* inodes in your filesystem?
>> Yes - it backups around 100 servers with a lot of files.
i rechecked this and it seems i sadly copied the wrong output ;-( sorry
for that.

Here is the correct one:
#~ df -i
/dev/sdb1            975173568 95212355 879961213   10% /mnt

Stefan

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