X-Original-To: pgsql-admin-postgresql.org@localhost.postgresql.org Received: from localhost (unknown [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id A4BC4D1B2BD for ; Thu, 22 Jul 2004 19:30:22 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 86081-06 for ; Thu, 22 Jul 2004 22:30:24 +0000 (GMT) Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by svr1.postgresql.org (Postfix) with ESMTP id 3A0F0D1B1BE for ; Thu, 22 Jul 2004 19:30:18 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.12.11/8.12.11) with ESMTP id i6MMUKpR013275; Thu, 22 Jul 2004 18:30:20 -0400 (EDT) To: Ian Burrell Cc: pgsql-admin@postgresql.org Subject: Re: Invalid page header In-reply-to: <41003B61.8070007@rentrak.com> References: <40FFF98C.3000309@rentrak.com> <11036.1090520647@sss.pgh.pa.us> <41003B61.8070007@rentrak.com> Comments: In-reply-to Ian Burrell message dated "Thu, 22 Jul 2004 15:10:41 -0700" Date: Thu, 22 Jul 2004 18:30:20 -0400 Message-ID: <13274.1090535420@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=0.0 tagged_above=0.0 required=5.0 tests= X-Spam-Level: X-Archive-Number: 200407/257 X-Sequence-Number: 14325 Ian Burrell writes: > Tom Lane wrote: >> It would probably be worth your while to look at the damaged page with >> pg_filedump before you zap it. The symptoms of hardware misfeasance and >> software errors are enough different that you can often tell which >> theory to believe by examining the bits. > I used pg_filedump on a backup of the database files. The block looks > like it is mostly zero bytes with a few x02 bytes thrown to just be > confusing. My interpretation of that would be a hardware glitch. A software problem would be more likely to look like copying the wrong data into the block, or possibly zeroing out the block when it shouldn't --- but the sprinkling of x02's rules out a misaimed memset(). Time to break out the RAM and disk test programs ... regards, tom lane