1740 Scsi Host Adapter Configuration; Selecting Primary Scsi Channel; Scsi Bios Address And Boot Device; Installing Four Or More Disk Drives On One Scsi Channel - HP LC2000r - NetServer - 128 MB RAM Handbook

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1740 SCSI Host Adapter Configuration

Configuring a 1740 SCSI adapter (either the HP D2649A or D1681A) may cause a "Shadow RAM diagnostic
failed" error message.
The SCSI BIOS uses the last 128 bytes of the 32 KB ROM space as a RAM buffer. In the 1740's .CFG file,
there is a "WRITABLE" parameter under each BIOS address option. This parameter can be set to either
"YES" or "NO."
To configure the 1740, the "WRITABLE" parameter for the ROM address of where the SCSI BIOS is
configured must be set to "YES." Otherwise, the server will not treat that address area as a writable memory
area.
You can use any text editor to edit the "WRITABLE" parameter in the following .CFG file:
1740 (D1681A):
1740A (D1681A or
D2649A):
For example, if you are going to use the D0000H area for the SCSI BIOS, perform the following:
1.Find the line that looks like: CHOICE="BIOS Base Address D0000H."
2.Set the "WRITABLE" parameter to "YES."
3.Save the .CFG file, and rerun EISA Config with the new .CFG file.

Selecting Primary SCSI Channel

Starting with the HP NetServer #1 diskette, version F.01.00, you may select Channel A (external) or Channel
B (internal) to be the primary SCSI channel. The system first looks for the boot drive on the primary channel;
if one is not found, it then looks on the secondary channel.

SCSI BIOS Address and Boot Device

A system will always boot from the device that is connected to the SCSI adapter with the lowest BIOS
address. The lowest BIOS address option for a 1740 Adapter (either the HP D2649A or D1681A) is C8000H,
and for a 2740 Adapter (HP D2078A) it is CC000H. For example, if a system uses both a 7770 and a 1740
controller and you want to boot from a device on the 1740, then the video must be shadowed to C0000H.
That will put the 7770's BIOS at E0000H, which will always be a higher address than the 1740's BIOS.

Installing Four or More Disk Drives on One SCSI Channel

If you want to connect four or more SCSI drives on the same SCSI channel, you may have excessive spin-up
delays in your system. This could result in the SCSI drives with higher addresses not being recognized by
the network operating system (NOS).
The default configuration of the HP SCSI 535 MB, 1 GB, and 2 GB hard disk drives has the delayed spin-up
feature enabled. The number of seconds the drive waits before spinning up after Power On is related to the
drive's SCSI address: the higher the address, the longer the delay. This feature controls the power demand
imposed by numerous drives spinning up simultaneously after Power On.
In general, when selecting an address for drives (default address is 0), select the lowest SCSI address
possible.
When installing the first three drives in an HP system, only use addresses 0, 1, and 2 and leave the Delayed
Spin-Up jumper in place (default setting).
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Jumper Jumper
Not
functional
!ADP0000.C
FG
!ADP0001.C
FG