RAL Tier1 Disk Servers

Kernel

The kernel is a custom build of 2.4.20

The custom kernel is configured as an SMP kernel with hyperthreading on with the following changes

Set up with i686 processor
Update to the latest version of aic7xxx and aic79xx driver(v2.0.12 or later), required to get our Adaptec cards to work.
Increase the tag queue depth from 32 to 253 for the SCSI driver to improve performance. This made a huge difference on the Clustervision 2003 hardware
Enable read streaming on the Adaptec drivers
Enable decoding of registers during diagnostics for the SCSI drivers to aid debugging.
Include NFS server over TCP
Include USB
Add profiling support
Include multi-LUN support. Otherwise arrays with 2 LUNs won't recognise the second LUN
Include EXT3 journalling filesystem support
Include Ext3 debugging support
Remove PCI HOTPLUG support
Remove IRDA
Remove HAMRADIO
Remove ISDN
Remove VIDEO for Linux
Remove Sound card support
Remove Bluetooth
Set Hardware Sensors to Module

The following values have been added to the default /etc/sysctl.conf

  # Increase performance on IFT arrays
  vm.max-readahead = 128
  vm.min-readahead = 128