Re: open database on read only file system

To my knowledge, it is not, no.

The FS must be read/write.

What I would do in this situation is to migrate it to a test/new system where no one can access it and bring it up r/w.

Or set up streaming replication. That gives you select-only.

________________________________
From: pgsql-admin-owner(at)postgresql(dot)org <pgsql-admin-owner(at)postgresql(dot)org> on behalf of xujian <jamesxu(at)outlook(dot)com>
Sent: Friday, October 7, 2016 2:43 PM
To: pgsql-admin(at)postgresql(dot)org
Subject: [ADMIN] open database on read only file system

Hi,
Could you please let me know if it is possible to open database on read-only file system?

I have a psotgresql 9.6 cluster, PGDATA folder is on READ-WRITE volume(system volume), user database is created on a table space which is located on another volume(data volume). Now we set the data volume to read only mode, before we changed the mode, I also disabled the auto vacuum, run checkpoint,
and vacuum free. We reboot the service, everything was fine until we tried to access the database.
===============
postgres=# \c userdb;
FATAL: could not open file "pg_tblspc/16384/PG_9.6_201608131/16468/2662": Read-only file system
===============

we enabled the debug mode, in log file, we saw
===============
FATAL: 42501: could not open file "pg_tblspc/16384/PG_9.6_201608131/16468/2662": Read-only file system
LOCATION: mdopen, md.c:609
===============

Does anyone know if there is anyway to run database on read-only file system? thanks

James

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