LU settings for HP MA and EMA systems

Logical unit (LU) settings are configurable at the LU level.

HSG80 controller LU settings supported by thesystem describes the options that must be set for each LU that is accessed by the system. LUs that are accessed by hosts can be configured differently.

Table 1. HSG80 controller LU settings supported by thesystem
Option HSG80 controller default setting Required system setting
TRANSFER_RATE_REQUESTED 20MHZ Not applicable
TRANSPORTABLE/ NOTRANSPORTABLE NOTRANSPORTABLE NOTRANSPORTABLE
ENABLE_ACCESS_PATH

ENABLE_ACCESS_
PATH=ALL

ENABLE_ACCESS_
PATH=ALL

DISABLE_ACCESS_PATH (See Note.) NO DEFAULT NO DEFAULT
IDENTIFIER/ NOIDENTIFIER NOIDENTIFIER Not applicable
MAX_READ_CACHE_SIZE 32 Not applicable
MAX_WRITE_CACHE_SIZE 32 64 or higher
MAX_CACHED_TRANSFER_SIZE 32 Not applicable
PREFERRED_PATH/ NOPREFERRED_PATH NOPREFERRED_PATH is set Not applicable
READ_CACHE/ NOREAD_CACHE READ_CACHE Not applicable
READAHEAD_CACHE/ NOREADAHEAD_CACHE READAHEAD_CACHE Not applicable
RUN/ NORUN RUN RUN
WRITE_LOG/NOWRITE_LOG NOWRITE_LOG NOWRITE_LOG
WRITE_PROTECT/ NOWRITE_PROTECT NOWRITE_PROTECT NOWRITE_PROTECT

WRITEBACK_CACHE/
NOWRITEBACK_CACHE

WRITEBACK_CACHE WRITEBACK_CACHE
Note: DISABLE_ACCESS_PATH can be used to disable access from specific hosts. It must always be overridden by using ENABLE_ACCESS_PATH=ALL on all connections to the system nodes.