| Previous | Contents | Index |
On VAX systems, SYSTEM_CHECK is a special parameter, which is subject to change at any time and should be modified only if recommended by HP.
The TAPE_ALLOCLASS parameter can also be used to generate a unique clusterwide name for tape devices with identical unit numbers.
This special parameter is used by HP and is subject to change. Do not change this parameter unless HP recommends that you do so.
TIME_CONTROL is an SMP bit mask parameter that controls debugging functions. The following bits are defined:
| Bit | Description |
|---|---|
| 0 | Obsolete. |
| 1 (EXE$V_SANITY) | Disables the SMP sanity timer support. |
| 2 (EXE$V_NOSPINWAIT) | Disables the functional behavior of the SMP spinwait support. |
HP recommends that you set the correct system time before allowing the system to run, so that all functions using time-stamping (such as the operator log, the error log, accounting records, file creation dates, and file expiration dates) contain correct time values. |
Depending on the value specified for the TIMEPROMPTWAIT parameter, the system acts in one of the following ways:
Setting TMSCP_LOAD to 0 inhibits the loading of the tape server and the serving of local tapes. Setting TMSCP to 1 loads the tape server into memory at the time the system is booted and makes all directly connected tape drives available clusterwide. The following table describes the two states of the TMSCP_LOAD parameter:
| State | Function |
|---|---|
| 0 | Do not load the TMSCP tape server. Do not serve any local tape devices clusterwide. This is the default value. |
| 1 | Load the TMSCP tape server. Serve all local TMSCP tape devices clusterwide. |
Starting with OpenVMS Version 7.2, the serving types are implemented as a bit mask. To specify the type of serving your system will perform, locate the type you want in the following table and specify its value. For some systems, you may want to specify two serving types, such as serving all tapes except those whose allocation class does not match. To specify such a combination, add the values of each type, and specify the sum.
In a mixed-version cluster that includes any systems running OpenVMS Version 7.1-x or earlier, serving all available tapes is restricted to serving all tapes except those whose allocation class does not match the system's allocation class (pre-Version 7.2 meaning). To specify this type of serving, use the value 9, which sets bit 0 and bit 3. The following table describes the serving type controlled by each bit and its decimal value:
| Bit | Value When Set | Description |
|---|---|---|
| Bit 0 | 1 | Serve all available tapes (locally attached and those connected to HS x and DSSI controllers). Tapes with allocation classes that differ from the system's allocation class (set by the ALLOCLASS parameter) are also served if bit 3 is not set. |
| Bit 1 | 2 | Serve locally attached (non-HS x and non-DSSI) tapes. |
| Bit 2 | N/A | Reserved. |
| Bit 3 | 8 |
Restrict the serving specified by bit 0. All tapes except those with
allocation classes that differ from the system's allocation class (set
by the ALLOCLASS parameter) are served.
This is pre-Version 7.2 behavior. If your cluster includes systems running OpenVMS Version 7.1- x or earlier, and you want to serve all available tapes, you must specify 9, the result of setting this bit and bit 0. |
Although the serving types are now implemented as a bit mask, the values of 0, 1, and 2, specified by bit 0 and bit 1, retain their original meanings:
If the TMSCP_LOAD system parameter is 0, TMSCP_SERVE_ALL is ignored.
The default value is usually adequate. Do not exceed the maximum value of 32767 when setting this parameter.
| Characteristic | Value (Hex) | Function |
|---|---|---|
| PASSALL | 1 | Passall. |
| NOECHO | 2 | Noecho mode. |
| NOTYPEAHEAD 1 | 4 | No type-ahead buffer. |
| ESCAPE | 8 | Escape sequence processing. |
| HOSTSYNC | 10 | Host can send XON and XOFF. |
| TTSYNC | 20 | Terminal can send XON and XOFF. |
| SCRIPT | 40 | Internal use only. |
| LOWER | 80 | Lowercase. |
| MECHTAB | 100 | Mechanical tabs. |
| WRAP | 200 | Wraparound at end of line. |
| CRFILL 1 | 400 | Perform carriage return fill. |
| LFFILL 1 | 800 | Perform line feed fill. |
| SCOPE | 1000 | Terminal is a scope. |
| REMOTE | 2000 | Internal use only. |
| EIGHTBIT | 8000 | Eight-bit terminal. |
| MBXDSABL | 10000 | Disable mailbox. |
| NOBRDCST | 20000 | Prohibit broadcast. |
| READSYNC | 40000 | XON and XOFF on reads. |
| MECHFORM | 80000 | Mechanical form feeds. |
| HALFDUP | 100000 | Set for half-duplex operation. |
| MODEM | 200000 | Set for modem signals. |
| PAGE | FF000000 | Page size. Default is 24. |
Where a condition is false, the value is 0.
The upper byte is the page length. The default characteristics are 24 lines per page, terminal synchronization, wraparound, lowercase, scope, and full-duplex.
| Characteristic | Value (Hex) | Function |
|---|---|---|
| LOCALECHO | 1 | Enable local echo terminal logic; use with the TTY_DEFCHAR NOECHO characteristic. |
| AUTOBAUD | 2 | Enable autobaud detection. |
| HANGUP | 4 | Hang up on logout. |
| MODHANGUP | 8 | Allow modification of HANGUP without privileges. |
| BRDCSTMBX | 10 | Allow sending of broadcasts to mailboxes. |
| XON | 20 | (No effect in this parameter.) |
| DMA | 40 | (No effect in this parameter.) |
| ALTYPEAHD | 80 | Use the alternate type-ahead parameters. |
| SETSPEED | 100 | Clear to allow setting of speed without privileges. |
| DCL_MAILBX | 200 | Function reserved for HP use only. |
| DECCRT4 | 400 | Terminal is DIGITAL CRT Level 4. |
| COMMSYNC | 800 | Enable flow control using modem signals. |
| EDITING | 1000 | Line editing allowed. |
| INSERT | 2000 | Sets default mode for insert. |
| FALLBACK | 4000 | Do not set this bit with SYSGEN. |
| DIALUP | 8000 | Terminal is a dialup line. |
| SECURE | 10000 | Guarantees that no process is connected to terminal after Break key is pressed. |
| DISCONNECT | 20000 | Allows terminal disconnect when a hangup occurs. |
| PASTHRU | 40000 | Terminal is in PASTHRU mode. |
| SYSPWD | 80000 | Log in with system password only. |
| SIXEL | 100000 | Sixel graphics. |
| DRCS | 200000 | Terminal supports loadable character fonts. |
| PRINTER | 400000 | Terminal has printer port. |
| APP_KEYPAD | 800000 | Notifies application programs of state to set keypad on exit. |
| ANSICRT | 1000000 | Terminal conforms to ANSI CRT programming standards. |
| REGIS | 2000000 | Terminal has REGIS CRT capabilities. |
| BLOCK | 4000000 | Block mode terminal. |
| AVO | 8000000 | Terminal has advanced video. |
| EDIT | 10000000 | Terminal has local edit capabilities. |
| DECCRT | 20000000 | Terminal is a DIGITAL CRT. |
| DECCRT2 | 40000000 | Terminal is a DIGITAL CRT Level 2. |
| DECCRT3 | 80000000 | Terminal is a DIGITAL CRT Level 3. |
The defaults are AUTOBAUD and EDITING.
| Characteristic | Value (Hex) | Function |
|---|---|---|
| TT3$M_BS | 10 | When this bit is set, the OpenVMS terminal console remaps CTRL/H to Delete. |
For more information, see the SET TERM and SHOW TERM commands in the HP OpenVMS DCL Dictionary.
The remainder of this discussion is of interest to customers who use Digi Edgeport hardware. |
TTY_SILOTIME controls latency, trading throughput and system overhead for latency. The default value for TTY_SILOTIME is 8. This value is multiplied by 100 and is used as a count of the number of times to send a query to the device for more data after a character transmit or receive is performed.
If no input (or no subsequent output) is seen after 800 responses to the query, the driver stops sending queries to the device and waits for an input interrupt. Reducing the TTY_SILOTIME value allows the device to buffer more data, with slightly higher latency.
Increasing the value of TTY_SILOTIME makes the device more sensitive to latency but decreases buffering and overall throughput; it also adds more system and USB overhead. Setting TTY_SILOTIME to zero causes the driver to send input queries to the device continually. This setting causes the lowest latency, the highest system overhead, and the lowest throughput possible.
On Alpha and I64 systems, this symbol is in the SYS$LOADABLE_IMAGES:SYS$BASE_IMAGE module.
On VAX systems, the symbol is in the SYS$SYSTEM:SYS.STB module.
On Alpha and I64 systems, this symbol is in the SYS$LOADABLE_IMAGES:SYS$BASE_IMAGE module.
On VAX systems, the symbol is in the SYS$SYSTEM:SYS.STB module.
On Alpha and I64 systems, this symbol is in the SYS$LOADABLE_IMAGES:SYS$BASE_IMAGE module.
On VAX systems, the symbol is in the SYS$SYSTEM:SYS.STB module.
On Alpha and I64 systems, this symbol is in the SYS$LOADABLE_IMAGES:SYS$BASE_IMAGE module.
On VAX systems, the symbol is in the SYS$SYSTEM:SYS.STB module.
| Value | Description |
|---|---|
| 0 | Never form or join a cluster. |
| 1 | Base decision of whether to form (or join) a cluster or to operate standalone on the presence of cluster hardware. |
| 2 | Always form or join a cluster. |
The static system parameter VBN_CACHE_S enables or disables file system data caching. By default its value is 1, which means that caching is enabled and the Virtual I/O Cache is loaded during system startup.
Setting the value to 0 disables file system data caching on the local node and throughout the OpenVMS Cluster. In an OpenVMS Cluster, none of the other nodes in the cluster can cache any file data until this node either leaves the cluster or reboots with VBN_CACHE_S set to 1.
This parameter enables virtual balance slots (VBS) to be created. A virtual balance slot holds the mapping for a memory-resident process that does not currently own a real balance slot (RBS). The set of real balance slots is timeshared among all memory-resident processes. With VBS enabled, the quantity of memory-resident processes is limited by the system parameter MAXPROCESSCNT. With VBS disabled, the quantity of memory-resident processes is limited by the system parameter BALSETCNT.
When creating a new process, if the set of real balance slots is allocated, then a virtual balance slot is created and the owner of a real balance slot is selected and transitioned to the virtual balance slot. The new process is created in the real balance slot. Processes are transitioned (faulted) back to a real balance slot as they are scheduled to execute on a CPU.
| Bit | Result |
|---|---|
| 0 | Enables VBS. All other VBS enables are subordinate to this enable. The default is disabled. |
| 1 | Enables the creation of a map for process-based direct I/O, allowing the process with direct I/O (DIO) outstanding to be transitioned to a virtual balance slot. Without DIO maps, a process with DIO outstanding retains its real balance slot for the duration of the DIO. This reduces the pool of available real balance slots for timesharing, which may result in a higher rate of faulting into the limited set of real balance slots. The default is enabled. |
| 2-7 | Reserved to HP for future use. |
| Previous | Next | Contents | Index |