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  1. Lustre
  2. LU-6226

lu-822 have a bad hash function for a switching files

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      after running sanity.sh i see very bad distribution for a fid's between OI files.

      [root@rhel6-64 tmp]# debugfs -R 'ls -l' lustre-mdt1 | grep oi.16 | grep -v 8192
      debugfs 1.42.7.wc1 (12-Apr-2013)
      22 100644 (1) 0 0 876544 9-Feb-2015 21:11 oi.16.0
      39 100644 (1) 0 0 491520 9-Feb-2015 21:11 oi.16.17
      70 100644 (1) 0 0 28672 9-Feb-2015 21:11 oi.16.48
      71 100644 (1) 0 0 2424832 9-Feb-2015 21:11 oi.16.49
      72 100644 (1) 0 0 483328 9-Feb-2015 21:11 oi.16.50
      73 100644 (1) 0 0 389120 9-Feb-2015 21:11 oi.16.51

      all other files 8k byte size - so likely unused.

      I don't see any reason to have 64 OI files if 5 only used.

      Please fix a hash function to have better distribution.

            wc-triage WC Triage
            shadow Alexey Lyashkov
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