best practices for separating data and logs

Hi all,

I'm planning a lot of changes for migrating to PostgreSQL 8.3, among
them being a better way of separating data and logs (transaction logs,
that is).

Currently, the OS and log data are on one disk system, and the data
(including configs) are on the other disk system. After creating the
database cluster, I copy the pg_xlog directory to the OS system and
symlink it from the database.

So, I'm wondering...

- Are there any best practices, or better practices, than symlinking?

- How do other people have this set up, or recommend setting this up
(e.g. also moving pg_clog or other things as well)?

I searched through the archives and found a few threads regarding
separating data and WAL, but nothing regarding best practices or
specifics.

Thanks,
Peter

P.S. Here are exact details on how I have things set up.

[root(at)mitchell testing-8.2]# pwd
/scratch.1/postgres/testing-8.2

[root(at)mitchell testing-8.2]# ls -l
total 48
drwx------ 8 postgres postgres 83 Oct 8 16:57 base
drwx------ 2 postgres postgres 4096 Oct 12 05:07 global
drwx------ 2 postgres postgres 94 Oct 9 14:28 pg_clog
-rw------- 1 postgres postgres 3841 Aug 28 14:16 pg_hba.conf
-rw------- 1 postgres postgres 1460 Aug 8 14:06 pg_ident.conf
drwx------ 4 postgres postgres 34 Aug 8 14:06 pg_multixact
drwx------ 2 postgres postgres 17 Oct 12 00:15 pg_subtrans
drwx------ 2 postgres postgres 6 Aug 8 14:06 pg_tblspc
drwx------ 2 postgres postgres 6 Aug 8 14:06 pg_twophase
-rw------- 1 postgres postgres 4 Aug 8 14:06 PG_VERSION
lrwxrwxrwx 1 root root 37 Oct 8 16:18 pg_xlog ->
/scratch/postgres/testing-8.2/pg_xlog
-rwxr-xr-x 1 postgres postgres 15212 Oct 11 15:05 postgresql.conf
-rw------- 1 postgres postgres 96 Oct 11 15:55 postmaster.opts
-rw------- 1 postgres postgres 57 Oct 11 15:55 postmaster.pid
-rw-r--r-- 1 postgres postgres 1805 Aug 8 14:06 server.crt
-rw------- 1 postgres postgres 1675 Aug 8 14:06 server.key

[root(at)mitchell testing-8.2]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 1019208 434264 532336 45% /
/dev/sda8 56394768 348344 53135448 1% /scratch
/dev/sda6 1019208 34664 931936 4% /tmp
/dev/sda3 4061572 202080 3649844 6% /var
/dev/sda7 1019208 701972 264628 73% /var/vice/cache
/dev/sda2 10154020 5616776 4013124 59% /usr
tmpfs 451556 0 451556 0% /dev/shm
/dev/sdb1 78110004 9589792 68520212 13% /scratch.1
AFS 9000000 0 9000000 0% /afs