Re: Duplicate values found when reindexing unique index

["Mason Hale" <masonhale(at)gmail(dot)com>]

Hello Tom --

a thousand thanks for taking the time to walk through those files.

This could be the kernel's fault, but I'm wondering whether the
RAID controller is going south.  Offhand it seems like the controller
would be the only place that would be likely to explain both the
bogus-data and good-data-in-wrong-place behaviors.

To clarify a bit further -- on the production server, the data is written to a 10-disk RAID 1+0, but the pg_xlog directory is symlinked to a separate, dedicated SATA II disk.

There is a similar setup on the standby server, except that in addition to the RAID for the data, and a separate SATA II disk for the pg_xlog, there is another disk (also SATA II) dedicated for the archive of wal files copied over from the production server.

I mention all this because if the problem is the wal files in the pg_xlog directory becoming corrupted, and those exist on a dedicated disk (not in a RAID), then doesn't that indicate that the RAID controller is not involved?

Mason