On Wed, May 25, 2011 at 4:41 PM, Greg Smith <greg@xxxxxxxxxxxxxxx> wrote: > On 05/23/2011 06:16 PM, John Rouillard wrote: >> >> OS: centos 5.5 >> Filesystem: data - ext4 (note 4 not 3); 6.6T formatted >> wal - ext4; 1.5T formatted >> Raid: data - level 10, 8 disk wd2003; controller LSI MegaRAID SAS 9260-4i >> wal - level 1, 2 disk wd2003; controller LSI MegaRAID SAS 9260-4i >> >> Could it be an ext4 issue? It seems that ext4 may still be at the >> bleeding edge for postgres use. >> > > I would not trust ext4 on CentOS 5.5 at all. ext4 support in 5.5 is labeled > by RedHat as being in "Technology Preview" state. I believe that if you had > a real RedHat system instead of CentOS kernel, you'd discover it's hard to > even get it installed--you need to basically say "yes, I know it's not for > production, I want it anyway" to get preview packages. It's not really > intended for production use. > > What I'm hearing from people is that they run into the occasional ext4 bug > with PostgreSQL, but the serious ones aren't happening very often now, on > systems running RHEL6 or Debian Squeeze. Those kernels are way, way ahead > of the ext4 backport in RHEL5 based systems, and they're just barely stable. So if you're running a RHEL5.4 or RHEL5.5 system, are you basically stuck with ext3? I'm not sure if I'm remembering correctly, but ISTM that you've been uncomfortable with BOTH ext4 and XFS prior to RHEL6; but OK with both beginning with RHEL6. Also, any tips on mount options for XFS/ext4/ext3? -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
