HP NetServer AA 4000 HP AA HP Netserver 4000 Reference Guide - Page 19

Changing the Windows NT

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Ch 1: Architecture Overview and Terminology To prevent this problem from occurring, you must change the default load order used by Windows NT. Changing the Windows NT default load order for SCSI adapter drivers requires modification to the Registry. Each adapter driver has a Registry key located at: \HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\% adapter_driver_name% (Where %adapter_driver_name% is the name of the SCSI adapter driver's Registry key. For example, an Adaptec 2940 driver has a Registry key name of aic78xx.) Each SCSI driver's Registry key name has an associated value named Tag.TheTag value contains a number that is used to control the load order of a particular SCSI driver. Smaller Tag values cause drivers to load before larger Tag values. The Adaptec 1542's Tag value can be changed to a value greater than the Adaptec 2940's Tag value, which will cause the Adapter 1542 adapter driver to load last, preventing the port number discrepancy discussed above. The Tag value controls the load order of different drivers. However, if one driver operates more than one SCSI adapter, the Tag value is useless for altering the port number assignment. In this case, it may be best to change an adapter's position in the PCI bus with regard to another adapter. For example, if you have a SCSI adapter in PCI slot 1, and later you add another SCSI adapter to PCI slot 0, and these adapters are controlled by the same SCSI driver, this may cause the SCSI adapter in slot 1 to have its SCSI port number assignment changed by Windows NT from 0 to 1. To prevent this port number discrepancy from occurring, try swapping the SCSI adapter in slot 1 with the one in slot 0. If changing the PCI bus position of an adapter has no effect, consider moving the devices from the original adapter to the newly installed adapter. You may be able to accomplish this by simply unplugging the SCSI bus cables from each adapter and swapping them. However, if it becomes too difficult to move devices from one adapter to another, you may want to consider reworking your AA 4000 device configuration database. Network Server Division 1-13

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Ch 1: Architecture Overview and Terminology
Network Server Division
1-13
To prevent this problem from occurring, you must change the default
load order used by Windows NT.
Changing the Windows NT
default load order for SCSI adapter drivers requires modification to
the Registry. Each adapter driver has a Registry key located at:
\HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\%
adapter_driver_name%
(Where %adapter_driver_name% is the name of the SCSI adapter
driver’s Registry key. For example, an Adaptec 2940 driver has a
Registry key name of aic78xx.)
Each SCSI driver’s Registry key name has an associated value
named Tag.TheTag value contains a number that is used to control
the load order of a particular SCSI driver. Smaller Tag values cause
drivers to load before larger Tag values. The Adaptec 1542’s Tag
value can be changed to a value greater than the Adaptec 2940’s Tag
value, which will cause the Adapter 1542 adapter driver to load last,
preventing the port number discrepancy discussed above.
The Tag value controls the load order of different drivers. However,
if one driver operates more than one SCSI adapter, the Tag value is
useless for altering the port number assignment. In this case, it may
be best to change an adapter’s position in the PCI bus with regard to
another adapter. For example, if you have a SCSI adapter in PCI slot
1, and later you add another SCSI adapter to PCI slot 0, and these
adapters are controlled by the same SCSI driver, this may cause the
SCSI adapter in slot 1 to have its SCSI port number assignment
changed by Windows NT from 0 to 1. To prevent this port number
discrepancy from occurring, try swapping the SCSI adapter in slot 1
with the one in slot 0.
If changing the PCI bus position of an adapter has no effect, consider
moving the devices from the original adapter to the newly installed
adapter. You may be able to accomplish this by simply unplugging
the SCSI bus cables from each adapter and swapping them.
However, if it becomes too difficult to move devices from one
adapter to another, you may want to consider reworking your AA
4000 device configuration database.