separating data and logs

Hi all,

I'm making a lot of changes for my eventual migration to postgres 8.3,
and I was considering changing how data and logs are separated for a
few of my servers.

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

So, I'm wondering...

- Are there any best practices, or better practices, than symlinking
this (possible config options)?

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

I searched through the archives and found a few threads regarding
this, but not quite what I am looking for.

Thanks,
Peter

P.S. For those of you wondering exactly how I have things set up,
here's a representative sample from my test server.

[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 396464 570136 42% /
tmpfs 517128 0 517128 0% /dev/shm
/dev/sda8 58191096 164436 58026660 1% /scratch
/dev/sda6 1041984 560 1041424 1% /tmp
/dev/sda2 10472128 5939032 4533096 57% /usr
/dev/sda3 4061572 172092 3679832 5% /var
/dev/sda7 1019208 300372 666228 32% /var/vice/cache
/dev/sdb1 78110004 18864924 59245080 25% /scratch.1
AFS 9000000 0 9000000 0% /afs