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This driver is for Compaq's SMART2 Intellegent Disk Array Controllers.

WARNING:

--------

This code is distributed without warranty.  Use at your own risk.

Installing:

-----------

You need to build a new kernel to use this device, even if you want to

use a loadable module.  This driver requires Leonard N. Zubkoff's excellent

patches to ll_rw_blk.c (to controll the number of scatter/gather elements

sent to lower disk drivers).  Visit http://www.dandelion.com/Linux/DAC960.html

to get his patches.

Apply the patch to a 2.0.36 kernel after applying Leonard's patch:

# cd linux

# patch -p1 

# patch -p1 

Then build a new kernel and turn on Compaq SMART2 Disk Array support.

Create device nodes for the diskarray device:

# mkdev.ida [ctlrs]

Where ctlrs is the number of controllers you have (defaults to 1 if not

specified).

EISA Controllers:

-----------------

If you want to use an EISA controller you'll have to turn on EISA support

and supply some insmod/lilo paramaters.  If the driver is compiled into the

kernel, must give it port/irq data at boot time.  For example, if you had

two SMART-2/E controllers, in EISA slots 1 and 2, on irqs 15 and 5 respectively

you'd give it a boot argument like this:

        smart2=0x1000,0xf,0x2000,0x5

If you were loading the driver as a module, you'd give load it like this:

        insmod cpqarray.o eisa=0x1000,0xf,0x2000,0x5

You can use EISA and PCI adapters at the same time.

Booting:

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You'll need to use a modified lilo if you want to boot from a disk array.

Its simply a version of lilo with some code added to tell it how to

understand Compaq diskarray devices.

Device Naming:

--------------

You need some entries in /dev for the ida device.  The mkdev.ida script

can make device nodes for you automatically.  Currently the device setup

is as follows:

Major numbers:

        72      ida0

        73      ida1

        74      ida2

        etc...

Minor numbers:

        b7 b6 b5 b4 b3 b2 b1 b0

        |----+----| |----+----|

             |           |

             |           +-------- Partition ID (0=wholedev, 1-15 partition)

             |

             +-------------------- Logical Volume number

The suggested device naming scheme is:

/dev/ida/c0d0           Controller 0, disk 0, whole device

/dev/ida/c0d0p1         Controller 0, disk 0, partition 1

/dev/ida/c0d0p2         Controller 0, disk 0, partition 2

/dev/ida/c0d0p3         Controller 0, disk 0, partition 3

/dev/ida/c1d1           Controller 1, disk 1, whole device

/dev/ida/c1d1p1         Controller 1, disk 1, partition 1

/dev/ida/c1d1p2         Controller 1, disk 1, partition 2

/dev/ida/c1d1p3         Controller 1, disk 1, partition 3