Poor disk performance on ML 350 G6

[joaoreis]

Hi, I have a fresh install of red hat enterprise linux 5.2 32bits and I'm facing very poor disk performance. I have 2 SAS 500GB disks in raid 1.

Here are the infos:

Linux cache.biodany.com.br 2.6.18-274.el5PAE #1 SMP Fri Jul 22 05:34:36 EDT 2011 i686 i686 i386 GNU/Linux

[root@cache ~]# hdparm -t /dev/cciss/c0d0
/dev/cciss/c0d0: Timing buffered disk reads:  298 MB in  3.05 seconds =  97.77 MB/secHDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device

[root@cache ~]# lspci00:00.0 Host bridge: Intel Corporation QuickPath Architecture I/O Hub to ESI Port (rev 13)00:01.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 1 (rev 13)00:02.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 2 (rev 13)00:03.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 3 (rev 13)00:04.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 4 (rev 13)00:05.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 5 (rev 13)00:06.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 6 (rev 13)00:07.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 7 (rev 13)00:08.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 8 (rev 13)00:09.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 9 (rev 13)00:0a.0 PCI bridge: Intel Corporation QuickPath Architecture I/O Hub PCI Express Root Port 10 (rev 13)00:0d.0 Host bridge: Intel Corporation Unknown device 343a (rev 13)00:0d.1 Host bridge: Intel Corporation Unknown device 343b (rev 13)00:0d.2 Host bridge: Intel Corporation Unknown device 343c (rev 13)00:0d.3 Host bridge: Intel Corporation Unknown device 343d (rev 13)00:0d.4 Host bridge: Intel Corporation Quickpath Interconnect Physical Layer Port 0 (rev 13)00:0d.5 Host bridge: Intel Corporation Quickpath Interconnect Physical Layer Port 1 (rev 13)00:0d.6 Host bridge: Intel Corporation Unknown device 341a (rev 13)00:0e.0 Host bridge: Intel Corporation Unknown device 341c (rev 13)00:0e.1 Host bridge: Intel Corporation Unknown device 341d (rev 13)00:0e.2 Host bridge: Intel Corporation Unknown device 341e (rev 13)00:0e.3 Host bridge: Intel Corporation Unknown device 341f (rev 13)00:0e.4 Host bridge: Intel Corporation Unknown device 3439 (rev 13)00:14.0 PIC: Intel Corporation QuickPath Architecture I/O Hub System Management Registers (rev 13)00:14.1 PIC: Intel Corporation QuickPath Architecture I/O Hub GPIO and Scratch Pad Registers (rev 13)00:14.2 PIC: Intel Corporation QuickPath Architecture I/O Hub Control Status and RAS Registers (rev 13)00:1c.0 PCI bridge: Intel Corporation ICH10 PCI Express Port 100:1d.0 USB Controller: Intel Corporation ICH10 USB UHCI Controller #100:1d.1 USB Controller: Intel Corporation ICH10 USB UHCI Controller #200:1d.2 USB Controller: Intel Corporation ICH10 USB UHCI Controller #300:1d.3 USB Controller: Intel Corporation ICH10 USB UHCI Controller #600:1d.7 USB Controller: Intel Corporation ICH10 USB2 EHCI Controller #100:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90)00:1f.0 ISA bridge: Intel Corporation ICH10 LPC Interface Controller00:1f.2 IDE interface: Intel Corporation ICH10 4 port SATA IDE Controller00:1f.5 IDE interface: Intel Corporation ICH10 2 port SATA IDE Controller01:03.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)01:04.0 System peripheral: Compaq Computer Corporation Integrated Lights Out Controller (rev 03)01:04.2 System peripheral: Compaq Computer Corporation Integrated Lights Out  Processor (rev 03)01:04.4 USB Controller: Hewlett-Packard Company Proliant iLO2 virtual USB controller01:04.6 IPMI SMIC interface: Hewlett-Packard Company Proliant iLO2 virtual UART02:00.0 PCI bridge: Broadcom EPB PCI-Express to PCI-X Bridge (rev b5)03:04.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5715 Gigabit Ethernet (rev a3)03:04.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5715 Gigabit Ethernet (rev a3)04:00.0 RAID bus controller: Hewlett-Packard Company Unknown device 323a (rev 01)

 I have installed the latest firmwares and drivers from hp.com/support. Any ideias?