Hello,

Now that 9.1 has been released, I have two questions:

1. Can we upgrade a 9.0 hot standby (replicating from a 9.0 master) to a 9.1 
standby while still replicating from the 9.0 master? Are there any version 
differences that would cause a problem? We would then eventually promote the 
9.1 machine to the master...
2. Is it possible to do something like the following:
  A. Pause Replication on a hot standby (using the pause_at_recovery_target 
recovery target setting)
  B. Call pg_dumpall on the slave
  C. Resume replication (by disabling the  pause_at_recovery_target recovery 
target setting)

During the pause, we would likely continue shipping WAL to the slave (unless 
this is unadvisable).

Is this a reasonable approach?

Thank you,

Andrew
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