HSG80 Enterprise/Modular Storage RAID Array Fibre Channel Solution Software V8.7A for Windows Release Notes (AA-RH0QL-TE, July 2003)

Configuration Rules

Release Notes – HSG80 Enterprise/Modular Storage RAID Array Fibre Channel Solution

Software Version 8.7A for Windows

• The initiator site data needs to be synchronized during a planned failover.

Mini-merge—If the target becomes inaccessible, the writes that would have gone to

the target are logged to the association set’s assigned log unit. An inaccessible target

in this context refers to both links or target controllers shutting down. When the target

becomes accessible, a full copy is not necessary. Only those host writes that occurred

while the links were down are reissued. This is referred to as a mini-merge. If a full

copy was in progress at the time of the disconnect, write history logging is not

initiated and the full copy is restarted when the target is accessible again.

Fast-Failback—During a planned failover, if write history logging was enabled at the

target site, then when the failback is performed, the initiator site is synchronized

through a process called fast-failback. The writes that would have gone to the initiator

are logged to the association set’s log unit. Only those writes that occurred since the

failover are reissued. A full copy is not necessary.

Dynamic Volume Expansion

Dynamic Volume Expansion creates a specialized volume called a concatset (short for

concatenation set) from a storageset that was given a unit number. Another storageset

can then be added to the concatset by using the

SET CONCATSET command. See the

HSG80 Array Controller ACS Version 8.7 CLI Reference Guide for syntax details.

Dynamic Disks

The use of SNAPSHOTs and SNAPCLONEs in HP SANs is not supported in a

Windows 2000 environment if the SNAPSHOT or SNAPCLONE is presented to the

same Windows 2000 host as the LUN from which the SNAPSHOT or SNAPCLONE

was created. SNAPSHOTs and SNAPCLONEs are features of the HSG80 and

HSV110 controller based HP Storage systems. All Dynamic disks on a system have

information in their metadata about the other dynamic disks that exist on the system.

When Windows is presented with 2 dynamic disks that have the same information on

them, it does not have code to resolve the conflict.

Configuration Rules

The following list defines maximum configuration rules for the controller:

• 128 visible LUNs/200 assignable unit numbers

— In SCSI-2 mode, the CCL is disabled, resulting in 128 visible LUNs.