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From: "Joshua D. Drake" on 3 Aug 2010 12:40
On Wed, 2010-08-04 at 00:34 +0800, Richard wrote:
> 1.To add live HA to PG, I transfer WAL of a database instance(Primary node) to another database instance (standby node) at real time, and keep startup alive in standby node to recovery WAL online,so that standby node can be a hot standby.
> But I got some trouble. When standby node switch to primary mode to accept connections, of course after startup initilize the WAL and exit, the postgres process ereportERROR
> when mdread function enter ERROR branch, and I got message like this
> "could not read block X of relation X/X/X: read only Xof X bytes". I
> spent two days to figure out what happened, but it is too hard.Please
> help me.

What are you using to transfer the WAL?

Did you read this chapter?

http://www.postgresql.org/docs/8.3/static/continuous-archiving.html

Sincerely,

Joshua D. Drake

>

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