ot rename temporary statistics file "pg_stat_tmp/pgstat.tmp" to "pg_stat_tmp/pgstat.stat": No such file or directory

Buenos dias todos.

Tengo este problema:

Tengo instalado postgres 9.1.3 y anoche la base de datos fallo debido al siguiente error:

Este fue el primer error despues de un autovacuum:

<2012-06-06 00:59:07 MDT 814 4fceffbb.32e
>LOG: autovacuum: found orphan temp table
"(null)"."tmpmuestadistica" in database
"dbRX"
<2012-06-06 01:05:26 MDT 1854 4fc7d1eb.73e
>LOG: could not rename temporary statistics file
"pg_stat_tmp/pgstat.tmp" to "pg_stat_tmp/pgstat.stat": No such file or
directory
<2012-06-06 01:05:28 MDT 1383 4fcf0136.567 >ERROR: tuple concurrently updated
<2012-06-06 01:05:28 MDT 1383 4fcf0136.567 >CONTEXT: automatic vacuum of table "global.pg_catalog.pg_attrdef"
<2012-06-06
01:06:09 MDT 1851 4fc7d1eb.73b >ERROR: xlog flush request
4/E29EE490 is not satisfied --- flushed only to 3/13527A10
<2012-06-06 01:06:09 MDT 1851 4fc7d1eb.73b >CONTEXT: writing block 0 of relation base/311360/12244_vm
<2012-06-06
01:06:10 MDT 1851 4fc7d1eb.73b >ERROR: xlog flush request
4/E29EE490 is not satisfied --- flushed only to 3/13527A10
<2012-06-06 01:06:10 MDT 1851 4fc7d1eb.73b >CONTEXT: writing block 0 of relation base/311360/12244_vm
<2012-06-06 01:06:10 MDT 1851 4fc7d1eb.73b >WARNING: could not write block 0 of base/311360/12244_vm
<2012-06-06 01:06:10 MDT 1851 4fc7d1eb.73b >DETAIL: Multiple failures --- write error might be permanent.

Anoche la base de datos fgue terminada por señal 6 y no quizo levantar:

<2012-06-07 01:36:44 MDT 2509 4fd05a0c.9cd >LOG: startup process (PID 2525) was terminated by signal 6: Aborted
<2012-06-07 01:36:44 MDT 2509 4fd05a0c.9cd >LOG: aborting startup due to startup process failure
<2012-06-07
01:37:37 MDT 2680 4fd05a41.a78 >LOG: database system shutdown
was interrupted; last known up at 2012-06-07 01:29:40 MDT
<2012-06-07
01:37:37 MDT 2680 4fd05a41.a78 >LOG: could not open file
"pg_xlog/000000010000000300000013" (log file 3, segment 19): No such
file or directory
<2012-06-07 01:37:37 MDT 2680 4fd05a41.a78 >LOG: invalid primary checkpoint record

La unica opcion para levantarla fue usando pg_resetxlog

Despues de levantarla muchas consultas me carcaban este error:
<2012-06-07 09:24:22 MDT 1306 4fd0c7a6.51a >ERROR: missing chunk number 0 for toast value 393330 in pg_toast_2619
<2012-06-07 09:24:31 MDT 1306 4fd0c7a6.51a >ERROR: missing chunk number 0 for toast value 393332 in pg_toast_2619

Algunas bases de datos las pude recuperar, otras las perdi.

Cre una nueva carpeta data y la reinicialice con initdb restaurando las bases de datos que pude recuperar y las demas del ultimo respaldo.

No es problema de espacio en disco duro, no es problema de permisos, no es problema de error en el sistema de archivos o en en el hardware, no hay ningun mensaje de error a nivel sistema operativo o a nivel hadrware.

Pueden ayudarme para saber que paso?

saludos y gracias de antemano.