03/23/16-14:57:16:022 (14618) 1 SMH Surrender Stage 1 started....(repeated 1 times)
03/23/16-14:57:16:774 (14616) 1 SMH Surrender Reduced to Stage 0.
03/23/16-15:11:28:123 (14618) 1 SMH Surrender Stage 1 started....(repeated 1 times)
03/23/16-15:11:29:083 (14615) 1 SMH Surrender Reduced to Stage 0....(repeated 1 times)

Использование системой Области Разделяемой Памяти

Легенда:
Потребитель - Подсистема, использующая Область Разделяемой Памяти
Выделить SMH/ST - Выделение SMH страниц для Строковой Таблицы конкретного пользователя.
Доступно SMH/ST - Доступно памяти в SMH страницах для Строковой Таблицы.
Используется SMH/ST - Используется памяти в SMH страницах для Строковой Таблицы.
SMT Используется - Используется памяти в Таблице Статической Памяти конкретным пользователем.
Используется GST - используемый объем в Основной Строковой Таблице (GST) конкретным пользователем.
Всего Используется - общий используемый объем в SMH/ST, SMT и GST конкретным пользователем.

Потребитель :
 Alloc SMH/ST SMH/ST Avail  SMH/ST Used     SMT Used     GST Used     All Used
------------------------------------------------------------------------------
1) Miscellaneous:
            0            0            0            0            0            0
2) Audit System:
            0            0            0         7164            0         7164
3) Classes Instantiated:
       589824        60160       529664          208            0       529872
4) Multi-Volume Databases Structures:
            0            0            0            0            0            0
5) Event System:
            0            0            0            0          448          448
6) Global Mapping:
       131072        56560        74512            0         1312        75824
7) License Upgrade:
            0            0            0            0            0            0
8) Lock Table:
       196608       194224         2384          168            0         2552
9) National Language Support:
            0            0            0       150868         1636       152504
10) Performance Monitor:
            0            0            0            0            0            0
11) Process Table:
            0            0            0       423056         4096       427152
12) Routine Buffer In Use Table:
            0            0            0          152            0          152
13) Security System:
        65536            0        65536        10368            0        75904
14) Shadowing:
     53411840            0     53411840         5208        35536     53452584
15) Shared Library:
            0            0            0            0          768          768
16) TTY Hash Table:
        65536        32712        32824            0            0        32824
17) DB Name & Directory:
        65536        65310          226            0            0          226
18) iKnow Language Model Data:
            0            0            0            0            0            0
19) Expand Daemon:
            0            0            0            0            0            0
------------------------------------------------------------------------------
Общий итог
 Alloc SMH/ST SMH/ST Avail  SMH/ST Used     SMT Used     GST Used     All Used
     54525952       408966     54116986       597192        43796     54757974
                                        SMT Доступно GST Доступно
                                              320312        21740
Всего SMT&GST                              Всего SMT    Всего GST
       983040                                 917504        65536
Всего Использовалось SMH страниц:
     55508992 (847 pages)
Всего Доступно SMH страниц:
      9502720 (145 pages)
Всего Сконфигурировано SMH страниц:
     65011712 (992 pages)

03/30/16-08:04:25:085 (2031) 1 [SYSTEM MONITOR] SMHPercentFull Warning: SMHPercentFull = 85 ( Warnvalue is 85).
03/30/16-08:04:25:085 (2031) 1 [SYSTEM MONITOR] SMHState Warning: Shared Memory Heap state Warning

I can confirm that both set of messages that your system is reporting are not the expression of 
"severe" problems with the instance, but more of "informational" level, with 
the suggestion to still take actions to resolve them, so to guarantee the best possible 
performance to your processes.
Starting with the first type of message, "SMH Surrender Stage 1 started / SMH Surrender 
Reduced to Stage 0", once your Caché instance will start to run low of free space in its 
internal gmheap generic memory heap area, it will send a signal to all running Caché processes to 
please release any unused gmheap pre-cached resource, so to return those memory segments 
to the general gmheap area.When you see the "reduced to stage 0" message, the system went 
back to a situation where enough free space was found in gmheap and the processes could go back 
to their own normal pre-caching levels.
The second warning message, "SMHPercentFull Warning: SMHPercentFull = 85", is directly 
related to the first one, with the warning being raised by our system monitor process, having 
spotted that the use of the gmheap area raised over the warning level of 85%.

In order to resolve both issues, you will want to increase your gmheap value further from its 
current setting of 51200.
As you indicated that the instance is acting as a shadow for two other instances, shadowing does 
like to have enough gmheap available so to pre-cache shadow data in memory, thus the increased use 
in gmheap in respect to other installations.

Assuming that you do have enough free/available physical memory, it could be worth doubling your 
current gmheap from 51200 to around 100MB:
a restart of the instance will be required to activate the changes.