On Thu, Mar 22, 2018 at 2:24 PM, Jeremy Finzel <finzelj@xxxxxxxxx> wrote: > I am running this on a san snapshot of our production system. I assume that > this will give me a valid check for file-system-level corruption. I am > going to kick it off and see if I find anything interesting. It might. Note that SAN snapshots might have corruption hazards, though. Postgres expects crash consistency across all filesystems, so you might run into trouble if you had a separate filesystem for WAL, for example. I know that LVM snapshots only provide a consistent view of a single logical volume, even though many LVM + Postgres setups will involve multiple logical volumes. This makes it possible for a small inconsistency across logical volumes to corrupt data. I don't know anything about your SAN snapshotting, but this is at least something to consider. -- Peter Geoghegan
