Re: pg_standby could not open wal file after selecting new timeline - Mailing list pgsql-hackers

On 5-Nov-08, at 1:00 PM, Tom Lane wrote:

> I wrote:
>> Huh, is it possible that Linux rejects O_SYNC for a file on ramdisk?
>
> I found this in the Fedora 9 manpage for open(2):
>
>       O_DIRECT support was added under Linux in kernel version  
> 2.4.10.  Older
>       Linux kernels simply ignore this flag.  Some filesystems may  
> not imple-
>       ment the flag and open() will fail with EINVAL if it is used.
>
> so it may not be ramdisk per se that's the issue, but the filesystem
> you're using on it.
>
> We set O_DIRECT along with O_SYNC whenever O_DIRECT is defined.  I
> wonder whether there's a need to make that decision more configurable.
>

fsync=off works fine if that helps


>             regards, tom lane