The problem is observed recently time.

After database backup "Dir inserting Attributes" job runs more than 5 hours. 
Previously, it takes less time. Size of database changed slightly, current size 
- 85Gb.
the loads of io system: iotop read 5 M/s, write several Kb
LA 1.4-2.2
atop retruns postgres process with bacula INSERT ... argument

hdparm -tT /dev/mapper/main-pgsql

/dev/mapper/main-pgsql:
  Timing cached reads:   14626 MB in  2.00 seconds = 7321.24 MB/sec
  Timing buffered disk reads: 918 MB in  3.03 seconds = 302.72 MB/sec



Request list contains:
BEGIN; LOCK TABLE Path IN SHARE ROW EXCLUSIVE MODE


===
Running Jobs:
Console connected at 20-Ок-2014 11:52
  JobId Level   Name                       Status
======================================================================
   8116 Full    fluorine.2014-10-19_00.25.00_40 Dir inserting Attributes
   8117 Full    hydrogen.2014-10-19_00.25.00_41 Dir inserting Attributes
   8118 Full    neon.2014-10-19_00.32.01_42 Dir inserting Attributes
   8122 Full    aluminium_DB0.2014-10-19_02.30.00_46 Dir inserting Attributes
   8124 Full    aluminium_DB5.2014-10-19_02.35.00_48 Dir inserting Attributes
   8127 Full    aluminium_DB2.2014-10-19_02.50.01_51 Dir inserting Attributes
   8129 Differe  hydrogen.2014-10-20_00.50.00_57 is waiting on max Client jobs
   8130 Differe  sulfur_bcp.2014-10-20_01.10.00_01 Dir inserting Attributes
   8131 Differe  boron_bcp.2014-10-20_02.00.00_03 Dir inserting Attributes
   8132 Differe  neon.2014-10-20_02.05.00_04 Dir inserting Attributes
   8133 Full    aluminium_PG5.2014-10-20_02.10.00_05 Dir inserting Attributes
   8134 Differe  fluorine.2014-10-20_02.20.00_06 Dir inserting Attributes
   8135 Full    aluminium_DB0.2014-10-20_02.30.00_07 Dir inserting Attributes
   8136 Full    aluminium_DB4.2014-10-20_02.34.00_08 Dir inserting Attributes
   8137 Full    aluminium_DB5.2014-10-20_02.35.00_09 Dir inserting Attributes
   8138 Full    phosphorus_bcp.2014-10-20_02.35.00_10 Dir inserting Attributes
   8139 Full    aluminium_PG0.2014-10-20_02.35.00_11 Dir inserting Attributes
   8140 Full    aluminium_PG2.2014-10-20_02.35.00_12 Dir inserting Attributes
   8141 Full    aluminium_DB2.2014-10-20_02.50.00_13 Dir inserting Attributes
   8142 Full    aluminium_BILL.2014-10-20_04.35.00_14 Dir inserting Attributes
====


postgresql.conf:
max_connections = 100
shared_buffers = 128MB
temp_buffers = 512MB
work_mem = 64MB
maintenance_work_mem = 32MB
fsync = off
checkpoint_segments = 90



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