User`s guide

RA8000/ESA12000 HSG80 Solution Software V8.5 for Sun Solaris
Page 52 387372-005 AA–RFBPE–TE
Switching SCSI Modes
When switching HSG80 controllers from SCSI-3 to SCSI-2 mode, the host
system should be rebooted after the change is made. This will clear any
unclaimed SCSI-3 CCL devices from the system. Failure to clear devices can
cause erratic Agent behavior or crash the NT system (BSOD). It is also
recommended that you reboot when changing from SCSI-2 to SCSI-3 mode.
Add Virtual Disk Wizard Cache Functionality
The Add Virtual Disk Wizard allows you to try to add a unit that has readahead
cache enabled while read cache is disabled. This is an invalid action. The
controller will not allow the “add unit” to execute. The result is a storageset
without an attached unit. This “orphaned” storageset may be used to create a new
unit by returning to the Add Virtual Disk Wizard and adding a unit of the same
redundancy level as the failed unit.
Ensure that you do not check Enable readahead cache if Enable read cache is
unchecked. Refer to Step four of the Add Virtual Disk Wizard.
Add Virtual Disk Wizard – Partitioned Units and Ports Functionality
The Add Virtual Disk Wizard allows you to choose a port when adding a unit
based upon a partitioned set that is different from the port of a current unit that is
using the same partition.
Ensure that you use a LUN Id that corresponds to units that have already been
used for a partitioned storageset. For example, if a unit using a partitioned set
has a LUN Id below 100 (e.g., D55), then the subsequent units should also be
below 100. Likewise, if a LUN Id is 100 or above, subsequent LUN Ids should
also be above 100.
LUN Id is set on Step 4 of the Add Virtual Disk Wizard.
NT Agent CCL Access Device Recognition
For ACS 8.5 in SCSI-3, it is possible to have multiple CCL’s based on the unit
offsets. Agent picks the last of the set as the access device. The CCL’s will not
appear in the disk administrator, but are visible in the registry with their port,
target, and LUN. The CCL will show as CCLp:b:t:I, each with a different target
number (port bus target LUN, e.g., CCL2:1:1:0) in the storage.ini file.