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This driver is for Compaq's SMART2 Intellegent Disk Array Controllers.
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WARNING:
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--------
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This code is distributed without warranty. Use at your own risk.
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Installing:
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-----------
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You need to build a new kernel to use this device, even if you want to
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use a loadable module. This driver requires Leonard N. Zubkoff's excellent
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patches to ll_rw_blk.c (to controll the number of scatter/gather elements
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sent to lower disk drivers). Visit http://www.dandelion.com/Linux/DAC960.html
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to get his patches.
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Apply the patch to a 2.0.36 kernel after applying Leonard's patch:
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# cd linux
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# patch -p1
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# patch -p1
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Then build a new kernel and turn on Compaq SMART2 Disk Array support.
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Create device nodes for the diskarray device:
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# mkdev.ida [ctlrs]
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Where ctlrs is the number of controllers you have (defaults to 1 if not
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specified).
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EISA Controllers:
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-----------------
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If you want to use an EISA controller you'll have to turn on EISA support
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and supply some insmod/lilo paramaters. If the driver is compiled into the
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kernel, must give it port/irq data at boot time. For example, if you had
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two SMART-2/E controllers, in EISA slots 1 and 2, on irqs 15 and 5 respectively
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you'd give it a boot argument like this:
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smart2=0x1000,0xf,0x2000,0x5
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If you were loading the driver as a module, you'd give load it like this:
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insmod cpqarray.o eisa=0x1000,0xf,0x2000,0x5
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You can use EISA and PCI adapters at the same time.
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Booting:
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--------
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You'll need to use a modified lilo if you want to boot from a disk array.
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Its simply a version of lilo with some code added to tell it how to
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understand Compaq diskarray devices.
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Device Naming:
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--------------
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You need some entries in /dev for the ida device. The mkdev.ida script
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can make device nodes for you automatically. Currently the device setup
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is as follows:
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Major numbers:
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72 ida0
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73 ida1
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74 ida2
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etc...
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Minor numbers:
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b7 b6 b5 b4 b3 b2 b1 b0
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|----+----| |----+----|
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| +-------- Partition ID (0=wholedev, 1-15 partition)
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+-------------------- Logical Volume number
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The suggested device naming scheme is:
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/dev/ida/c0d0 Controller 0, disk 0, whole device
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/dev/ida/c0d0p1 Controller 0, disk 0, partition 1
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/dev/ida/c0d0p2 Controller 0, disk 0, partition 2
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/dev/ida/c0d0p3 Controller 0, disk 0, partition 3
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/dev/ida/c1d1 Controller 1, disk 1, whole device
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/dev/ida/c1d1p1 Controller 1, disk 1, partition 1
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/dev/ida/c1d1p2 Controller 1, disk 1, partition 2
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/dev/ida/c1d1p3 Controller 1, disk 1, partition 3
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