Poor performance on HP Package Cluster

Hi!

I've set up a Package Cluster ( Fail-Over Cluster ) on our two HP DL380
G4 with MSA Storrage G2.( Xeon 3,4Ghz, 6GB Ram, 2x 36GB(at)15rpm- Raid1)
The system is running under Suse Linux Enterprise Server.

My problem is, that the performance is very low. On our old Server
( Celeron 2Ghz with 2 GB of Ram ) an import of our Data takes about 10
minutes. ( 1,1GB data )
One of the DL380 it takes more than 90 minutes...
Selects response time have also been increased. Celeron 3 sec, Xeon
30-40sec.

I'm trying to fix the problem for two day's now, googled a lot, but i
don't know what to do.

Top says, my CPU spends ~50% time with wait io.

top - 14:07:34 up 22 min, 3 users, load average: 1.09, 1.04, 0.78
Tasks: 74 total, 3 running, 71 sleeping, 0 stopped, 0 zombie
Cpu(s): 50.0% us, 5.0% sy, 0.0% ni, 0.0% id, 45.0% wa, 0.0% hi,
0.0% si
Mem: 6050356k total, 982004k used, 5068352k free, 60300k buffers
Swap: 2097136k total, 0k used, 2097136k free, 786200k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
9939 postgres 18 0 254m 143m 140m R 49.3 2.4 8:35.43 postgres:
postgres plate [local] INSERT
9938 postgres 16 0 13720 1440 1120 S 4.9 0.0 0:59.08 psql -d
plate -f dump.sql
10738 root 15 0 3988 1120 840 R 4.9 0.0 0:00.05 top -d
0.2
1 root 16 0 640 264 216 S 0.0 0.0 0:05.03 init
[3]
2 root 34 19 0 0 0 S 0.0 0.0 0:00.00
[ksoftirqd/0]

vmstat 1:

ClusterNode2 root $ vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
r b swpd free buff cache si so bi bo in cs us sy
id wa
1 0 0 5032012 60888 821008 0 0 216 6938 1952 5049 40
8 15 37
0 1 0 5031392 60892 821632 0 0 0 8152 2126 5725 45
6 0 49
0 1 0 5030896 60900 822144 0 0 0 8124 2052 5731 46
6 0 47
0 1 0 5030400 60908 822768 0 0 0 8144 2124 5717 44
7 0 50
1 0 0 5029904 60924 823272 0 0 0 8304 2062 5763 43
7 0 49

I've read (2004), that Xeon may have problems with content switching -
is the problem still existing? Can I do something to minimize the
problem?

postgresql.conf:

shared_buffers = 28672
effective_cache_size = 400000
random_page_cost = 2

shmall & shmmax are set to 268435456

hdparm:

ClusterNode2 root $ hdparm -tT /dev/cciss/c0d0p1

/dev/cciss/c0d0p1:
Timing buffer-cache reads: 3772 MB in 2.00 seconds = 1885.34 MB/sec
Timing buffered disk reads: 150 MB in 2.06 seconds = 72.72 MB/sec

greetings Ernst