Forgive my stupidity, are you running PostgreSQL with the data on an NFS share?

D'Arcy J.M. Cain wrote:

I have posted before about this but I am now posting to both NetBSD and PostgreSQL since it seems to be some sort of interaction between the two. I have a NetAPP filer on which I am putting a PostgreSQL database. I run PostgreSQL on a NetBSD box. I used rsync to get the database onto the filer with no problem whatsoever but as soon as I try to open the database the NFS mount hangs and I can't do any operations on that mounted drive without hanging. Other things continue to run but the minute I do a df or an ls on that drive that terminal is lost.

On the NetBSD side I get a "server not responding" error. On the filer I see no problems at all. A reboot of the filer doesn't correct anything.

Since NetBSD works just fine with this until I start PostgreSQL and PostgreSQL, from all reports, works well with the NetApp filer, I assume that there is something out of the ordinary about PostgreSQL's disk access that is triggering some subtle bug in NetBSD. Does the shared memory stuff use disk at all? Perhaps that's the difference between PostgreSQL and other applications.

The NetApp people are being very helpful and are willing to follow up any leads people might have and may even suggest fixes if necessary. I have Bcc'd the engineer on this message and will send anything I get to them.

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