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Milen,

> XFS, EXT3, JFS
For what reason are you planning to use a journaling FS? I think using WAL, fsyncing every transaction and using a journaling FS is tautologous. And if you have problems using EXT2 you can just add the journal later without loosing data.
My tests using EXT2 showed a performance boost up to 50% on INSERTs.

Christian

> I am pretty exited whether XFS will clearly outpertform ETX3
> (no default setups for both are planned !). I am not sure
> whether is it worth to include JFS in comparison too ...
>
>
> Best Regards,
> Milen Kulev
>

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TIP 6: explain analyze is your friend

* Christian Koth:

> For what reason are you planning to use a journaling FS? I think
> using WAL, fsyncing every transaction and using a journaling FS is
> tautologous.

The journal is absolutely required to preserve the integrity of the
file system's own on-disk data structures after a crash. Even if
you've got a trustworthy file system checker (there are surprisingly
few of them, especially for advanced file systems without fixed data
structure locations), running it after a crash usually leads to
unacceptably high downtime.

--
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Durlacher Allee 47 tel: +49-721-96201-1
D-76131 Karlsruhe fax: +49-721-96201-99

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On Thu, Aug 03, 2006 at 01:10:39AM -0600, Koth, Christian (DWBI) wrote:
>For what reason are you planning to use a journaling FS? I think using WAL, fsyncing every transaction and using a journaling FS is tautologous. And if you have problems using EXT2 you can just add the journal later without loosing data.
>My tests using EXT2 showed a performance boost up to 50% on INSERTs.

The requirements for the WAL filesystem and for the data filesystem are
different. Having the WAL on a small ext2 filesystem makes sense and is
good for performance. Having the data on a huge ext2 filesystem is a
horrible idea, because you'll fsck forever if there's a crash, and
because ext2 isn't a great performer for large filesystems. I typically
have a couple-gig ext2 WAL paired with a couple of couple-hundred-gig
xfs data & index partitions. Note that the guarantees of a journaling fs
like xfs have nothing to do with the kind of journaling done by the WAL,
and each has its place on a postgres system.

Mike Stone

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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match