There are several restrictions on using ECS mode:
- ECS and VVDS protocols cannot be used simultaneously for a catalog.
This is enforced by the catalog address space. If you attempt to
use a catalog that is currently ECS-active from a non-ECS system in
the sysplex, the associated catalog request fails with return code
RC228 and reason code RSN26.
Warning: Access to ECS catalogs is restricted to within a parallel
sysplex. Attempts to alter ECS-active catalogs from outside the sysplex
result in data integrity errors. If you must access a catalog that
is or has been ECS-active in a sysplex from outside the sysplex, you
must first explicitly deactivate the catalog by issuing the following
operator command from one of the systems within the sysplex:
MODIFY CATALOG,ECSHR(REMOVE,catname)
If
you must access multiple or an unknown number of ECS-eligible catalogs
outside the sysplex, follow the procedure described in
Disconnecting from the structure to disconnect all systems in the
sysplex from the structure. Taking a system down or out of the sysplex
does NOT properly deactivate ECS-active catalogs.
- No more than 1024 catalogs can currently be shared using ECS from
a single system.
- All systems sharing the catalog in ECS mode must have connectivity
to the same Coupling Facility, and must be in the same global resource
serialization (GRS) complex.
- When you use catalogs in ECS mode, convert the resource SYSIGGV2
to a SYSTEMS enqueue. Otherwise, the catalogs in ECS mode will be
damaged.