Selecting Device Drivers for a Disk Device and Interface

The following sections (covering SCSI interfaces and floppy disk drives) identify the device drivers that must be present in the kernel for HP-UX to communicate with your disk device. Choose the device drivers based on the interface to which you are configuring the disk device.

If you are configuring a custom-written device driver on a Series 700, consult the Driver Development Guide for guidelines.

Once you have identified your device drivers, proceed to “Configuring HP-UX for a New Disk Device”.

SCSI Disk Configuration Guidelines

The SCSI address of a device dictates the device's priority when arbitrating for the SCSI bus. Use SCSI address 7 for the highest priority device (usually the host), followed by subsequent addresses in descending order: 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8.

Each fast/wide/differential SCSI-II card can support up to 15 peripherals, including up to 7 disk arrays. Due to limitations in SCSI-II, disk arrays can be connected to addresses 0 through 7 only; do not connect disk arrays to addresses 8 through 15.

HP-UX recommends UPS for powerfail protection of fast/wide/differential disk arrays.

Do not exceed 6 meters maximum cabling for single-ended SCSI and 25 meters maximum for fast/wide/differential SCSI configurations.

Make sure that every SCSI bus is properly terminated.

Table 4-1 “SCSI-II Disk Configuration Requirements” lists the HP disk and CD-ROM devices configurable through the SCSI interface on Series 700 and 800 systems.

Note, the c#t#d#[s#] syntax used in default device special files derives from ioscan output: c# is the card instance for the ext_bus class of interface card to which the device is attached, t# is the target (SCSI address) of the disk device on the interface, d# is the device unit number. s# specifies section number and is provided for backward compatibility; the device file addresses the entire disk (s0) when s# is unspecified. (See the disk(7) manpage.)

Table 4-1 SCSI-II Disk Configuration Requirements

Architecture (SCSI-II Type)	Interface Card	Interface and Device Drivers	Default Device File
Series 700 Core I/O (Single-Ended)^[1]	(internal)	`sdisk`^[2]	`/dev/[r]disk/c#t#d#[s#]`
Series 700 EISA (Fast/Narrow/Differential)^[3]	25525B	`eisa` `sdisk`^[2]	(same as above)
Series 700 Models 735, 755^[4] (Fast/Wide/Differential)	(internal)	`sdisk`^[2]	(same as above)
Series 800 CIO Single-Ended)^[5]	27147A	`scsi2`^[6] `disc3`^[7]	(same as above)
Series 800 HP-PB Single-Ended)^[8]	28655A	`scsi1` `disc3`^[7]	(same as above)
Series 800 HP-PB (Fast/Wide/Differential) ^[9]	25525B	`scsi3` `disc3`^[7]	(same as above)
^[1]The following disk devices can be configured to a Series 700 Single-Ended SCSI-II interface: (A1999A), (A2655A), 2657A, C2214B, C2216T, C2217C, (C2291A), C2293A/T/U, C2295B, C2473T, C2963A, C2964A, C3020T, C3021T, C3023T, C3024T, C3027TU, C3028U, A3182A. (Models shown in parenthesis are obsolete and are listed for reference only.) ^[2]Specifying `sdisk` causes `sctl`, `c700`, and `c720` to be included automatically in the kernel. ^[3]The following disk devices can be configured to a Series 700 Fast/Narrow/Differential EISA/SCSI-II: (C2425JK), (C2427JK), C2435A, (C2436HA), C2436HZ, C2438A, (C2439HA), C2439HZ/JA/JZ, (C2440HA), C2440HZ/JA/JZ, C2474J, (C2481A), (C2482A), (C2491A), (C2492A). (Models shown in parenthesis are obsolete and are listed for reference only.) ^[4]The following disk devices can be configured to a Series 700 Fast/ Wide/Differential SCSI-II interface: C2435A, (C2436HA), C2436HZ, C2437HA/HZ, C2438A, (C2439HA), C2439HZ/JA/JZ, (C2440HA), C2440HZ/JA/JZ, C3032T, C3033T, C3034T, C3035T, C3036T, C3037U, C3038U, A3058A. The (C2425JK) and (C2427JK) can also be connected, but will not use the Wide SCSI capability. (Models shown in parenthesis are obsolete and are listed for reference only.) ^[5]The following disk devices can be configured to a Series 800 CIO Single-Ended SCSI-II interface: C2462F/R, C2474F/R/S, C2476F/R, A3182A. ^[6]Specifying `scsi2` causes `cio_ca0` to be included automatically in the kernel. ^[7]Specifying `disc3` causes `target` to be included automatically in the kernel. ^[8]The following disk devices can be configured to a Series 800 HP-PB Single-Ended SCSI-II interface: (7957B), (7958B), (7959B), (A1999A), (A2655A), C2212A, (C2213A), C2281A, C2282A, (C2290A), (C2291A), C2460F/R, C2461F/R, (C2470S), (C2471S), C2472F/R/S, C2473F/R/S, C3020T, C3022R/T, C3023R/RZ/T, C3024R/RZ/T, C3027U, C3028U, C3040R/T, C3041R/T, C3044U, A3182A, C3560U. (Models shown in parenthesis are obsolete and are listed for reference only.) ^[9]The following disk devices can be configured to a Series 800 Fast/ Wide/Differential SCSI-II interface: C2435A, C2436HA/HZ, C2437HA/HZ, C2438A, C2439HA/HZ/JA/JC, C2440HA/HZ/JA/JZ, C3032R/T, C3035R/T, C3036T, C3037U, C3050R/T, C3051R/T, A3051A, A3231A, A3232A, C3550R/T, C3551R/T, C3553RZ, C3554U.

Floppy Disk Drive Configuration Guidelines

Although floppy disk drives are installed internally, the following table is included to ensure that you have the device-driver information necessary to access the drive.

Note that a PC floppy is installed on a Model 712 system, while SCSI floppy disk drives are installed on some Series 700 and E-class (Series 800) computers.

(See also “Considerations for Configuring a Floppy Disk Drive” for information about using a floppy disk drive with HP-UX.)

Table 4-2 Floppy Disk Drive Configuration Requirements

Architecture	Interface Card	Interface and Device Drivers	Default Device File
Model 712	(internal)	`pcfdc` `pcfloppy`	`/dev/[r]floppy/c#t#d#` ^[1]
Series 700 Single-Ended SCSI	(internal)	`sflop`	(same as above)
Model E Single-Ended SCSI	(internal)	`disc3` ^[2]	(same as above)
^[1]`c#t#d#` derives from `ioscan` output: `c#` is the card instance for the `ext_bus` class of interface card to which the device is attached, `t#` is the target (SCSI address) of the disk device on the interface, `d#` is the device unit number. See disk(7). ^[2]Specifying `disc3` causes `target` to be included automatically in the kernel.

Selecting Device Drivers for a Disk Device and Interface

Technical documentation

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SCSI Disk Configuration Guidelines

Floppy Disk Drive Configuration Guidelines