Stange IO error while working with large objects.

From: Dmitriy Igrishin <dmitigr(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Stange IO error while working with large objects.
Date: 2011-03-30 09:20:35
Message-ID: AANLkTi=dcmxttHaf9=9uOD20UbujchQ0+VcuXCSMSRsk@mail.gmail.com
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Hey all,

I've never experienced such problems before pefrorming some tests
on large objects. I am on Ubuntu and my HDD is whole encrypted
(LVM2). I've imported large object ~ 1.5 Gb of size. After this, entire
system lost performance dramaticaly and the disk activity becomes
anomalous.

After reboot everithing is fine with OS, but attempt to remove all
large object results in error:

dmitigr=# select lo_unlink(loid) from (select distinct loid from
pg_largeobject) as foo;
ERROR: could not read block 704833 in file "base/16386/11838.5": read only
4096 of 8192 bytes

What does this means -- hardware / OS / Postgres failure ?

Any suggestions ?

--
// Dmitriy.

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