Обсуждение: ERROR: could not read block 4 ...

Hi, I'm getting this error:

2016-09-15 09:35:24 ART [13984-1] ERROR:  could not read block 4 in file
"base/12210/11965": Error de entrada/salida
2016-09-15 09:35:39 ART [14082-1] ERROR:  could not read block 4 in file
"base/12210/11965": Error de entrada/salida
2016-09-15 09:35:54 ART [14170-1] ERROR:  could not read block 4 in file
"base/12210/11965": Error de entrada/salida
2016-09-15 09:36:09 ART [20704-1] ERROR:  could not read block 4 in file
"base/12210/11965": Error de entrada/salida

To find out which database points to it I use:

mydb=# select oid, datname from pg_database;
   oid  |  datname
-------+-----------
      1 | template1
  12210 | template0 <--- Looks like this is the problematic db
  12215 | postgres
  16384 | mydb

Two questions:

1) Is this caused by a bad block?, can fsck fix it?.
2) Is there a way to re-generate template0?.

Regards,
--
Leonardo M. Ramé
Medical IT - Griensu S.A.
Av. Colón 636 - Piso 8 Of. A
X5000EPT -- Córdoba
Tel.: +54(351)4246924 +54(351)4247788 +54(351)4247979 int. 19
Cel.: +54 9 (011) 40871877

"=?UTF-8?Q?Leonardo_M._Ram=c3=a9?=" <l.rame@griensu.com> writes:
> Hi, I'm getting this error:
> 2016-09-15 09:35:24 ART [13984-1] ERROR:  could not read block 4 in file
> "base/12210/11965": Error de entrada/salida

That looks like a hardware problem ... might want to budget for a new disk
sometime soon, before failures become more prevalent.

> 1) Is this caused by a bad block?, can fsck fix it?.

yes, and fsck is unlikely to help, though you could try.

> 2) Is there a way to re-generate template0?.

If you've never modified template1, you could drop template0 and re-create
it from template1.  Otherwise, pg_dumpall/initdb/reload would seem to be
called for.  A cautious person might want to do the latter anyway in case
there's more problems than just this one.

            regards, tom lane

El 15/09/16 a las 11:05, Tom Lane escribió:
> "=?UTF-8?Q?Leonardo_M._Ram=c3=a9?=" <l.rame@griensu.com> writes:
>> Hi, I'm getting this error:
>> 2016-09-15 09:35:24 ART [13984-1] ERROR:  could not read block 4 in file
>> "base/12210/11965": Error de entrada/salida
> That looks like a hardware problem ... might want to budget for a new disk
> sometime soon, before failures become more prevalent.
>
>> 1) Is this caused by a bad block?, can fsck fix it?.
> yes, and fsck is unlikely to help, though you could try.
>
>> 2) Is there a way to re-generate template0?.
> If you've never modified template1, you could drop template0 and re-create
> it from template1.  Otherwise, pg_dumpall/initdb/reload would seem to be
> called for.  A cautious person might want to do the latter anyway in case
> there's more problems than just this one.
>
>             regards, tom lane

Thanks, indeed, I'm moving the Db to another server.

--
Leonardo M. Ramé
Medical IT - Griensu S.A.
Av. Colón 636 - Piso 8 Of. A
X5000EPT -- Córdoba
Tel.: +54(351)4246924 +54(351)4247788 +54(351)4247979 int. 19
Cel.: +54 9 (011) 40871877