Filter
Top Products
Common Platform Issues
8 Data Replication Manager HSG80 ACS Version 8.7P Release Notes
Common Platform Issues
Performance Considerations—Adding Target Unit Back to Remote Copy Sets
Each remote copy set is forced into a full normalization when you add back the target unit
using the following command:
SET RemoteCopySetName ADD = TargetRemoteCopyName\UnitName
Example: set rcs1 add = buildngA\d1
In some cases this normalization has an impact on data replication performance and therefore
should not be performed during periods of high I/O activity at the target site. You may wish to
stagger the normalization of each remote copy set to minimize the performance impact.
Performance Considerations—Full Copy Operation
During full copy operations, host I/O performance is moderately reduced, and the length of
time required for the copy operation is longer than that for a merge operation.
Performance Considerations—Write History Log Merge
During Write History Log merge, host I/O performance is drastically reduced due to the high
priority given to the merge operation. The length of time required for the merge operation is
affected by host I/O, as new I/O is added to the end of the Write History Log, while the oldest
is pulled from the beginning of the log.
SWCC and OpenView Management Appliance Limitations
The HSG80 controller does not distinguish between commands issued from in-band command
tools (SWCC, Command Scripter, or the HP OpenView Storage Management Appliance) and
commands issued out of band through the serial port. Serial port commands should be
performed only when the customer has restricted commanding from other sources. Special
care must be taken with the Storage Management Appliance (SMA), as it periodically issues
polling commands that can interrupt serial port communications. If you will be using the serial
port on the HSG80 controller, remove the SMA from the fabric or use switch zoning to isolate
the SMA from the array in which controllers are commanded through a serial port.
Using Switch Zoning to Prevent Crashes When Using VTDPY Host Display
The HSG80 controller may crash when using the Display Host functionality in VTDPY. If
more than 21 connections are displayed (the equivalent of one page), the controller will crash
with a last fail code of 01932588 (cache data allocation parity error). HP recommends that you
use switch zoning to limit the number of connections visible to the controller. For more
information about switch zoning, refer to the HP StorageWorks Data Replication Manager
HSG80 ACS Version 8.7P Configuration Guide.
Invalid VTDPY Percentages
During the transition time between site failover and site failback, the log, merge, and copy
percentages on the original initiator displayed by VTDPY are not valid. Disregard these
percentages.