Simon Riggs wrote:
On Fri, 2007-03-30 at 11:27 +0100, Richard Huxton wrote:

Is that always true? Could the backup not pick up a partially-written page? Assuming it's being written to as the backup is in progress. (We are talking about when disk blocks are smaller than PG blocks here, so can't guarantee an atomic write for a PG block?)

Any page written during a backup has a backup block that would not be
removable by Koichi's tool, so yes, you'd still be safe.

i.e. between pg_start_backup() and pg_stop_backup() we always use full
page writes, even if you are running in full_page_writes=off mode.

Ah, that's OK then.

  Richard Huxton
  Archonet Ltd

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