1 – SERVER
This command starts the LASTport/Disk server and sets various
server and cache characteristics.
Usually, this command is executed by SYS$STARTUP:ESS$LAD_
STARTUP.COM using data from SYS$STARTUP:ESS$LAD_STARTUP.DAT.
VSI strongly recommends that you make all modifications in the
SYS$STARTUP:ESS$LAD_STARTUP.DAT file.
You can use the START SERVER command interactively to use its
qualifiers to change server settings so long as no services are
currently defined.
NOTE
If you enter the START SERVER command directly, you must
specify all four qualifiers, or the system will revert to
using default values.
Format
START SERVER
1.1 – Qualifiers
1.1.1 /BUFFER_SIZE
/BUFFER_SIZE=n
The InfoServer block cache is structured as an array of fixed-
size buffers (also called buckets.) The /BUFFER_SIZE qualifier
determines the size of each bucket. (The /CACHE qualifer
determines the number of buckets.)
The numeric value of this parameter is an integer between 3 and
8 inclusive, representing the bucket size in 512-byte blocks as
follows:
3 - 8 blocks (default)
4 - 16 blocks
5 - 32 blocks
6 - 64 blocks
7 - 128 blocks
8 - 256 blocks
The default value is 3.
Bucket sizes that are larger than 32 blocks are not appropriate
for most users. The OpenVMS client segments I/O requests that
are larger than 31 blocks into 31-block chunks, and the default
bucket readahead behavior might result in unnecessary I/O
activity to the disk.
1.1.2 /CACHE
/CACHE = number-of-buckets (default = 512)
The InfoServer block cache is structured as an array of
fixed-size buffers (also called buckets. The /CACHE qualifier
determines the number of buckets in the cache. The /BUFFER_SIZE
qualifier determines the size of each bucket.
Numbers larger than 16384 can adversely affect performance.
Consider increasing the /BUFFER_SIZE qualifier to reach the
desired cache size.
1.1.3 /MAXIMUM_SERVICES
/MAXIMUM_SERVICES = maxservice (default = 256)
Sets the maximum service count for the server. This is the
maximum number of services that can be defined at one time.
Each service descriptor consumes non-paged pool; however, unused
service slots consume only 4 bytes each.
The maximum value is 1024.
1.1.4 /WRITE_QUOTA
/WRITE_QUOTA = n (default = 0)
Number of simultaneous synchronous writes permitted within the
server. The default of zero means that all write operations are
performed synchronously.
1.2 – Example
$ InfoServer SHOW SERVER
Node BILBO [HP rx2600 (900MHz/1.5MB)] running OpenVMS XAR8-D2Y
LASTport/Disk Server Version 1.2
Max Services: 64 Write Quota: 0
Cache Buckets: 2048 Cache Bucket Size: 32 blocks
Cache Size: 33554432 bytes
Hits: 0 Hit Percentage: 0%
Misses: 0
Current Sessions: 0 Peak Sessions: 0
Read Write
Requests: 0 0
Blocks: 0 0
Errors: 0 0
Aborted: 0 0
Conflicts: 0 0
$ InfoServer START SERVER/MAXIMUM_SERVICES=128
/CACHE=2048/BUFF=5/WRITE=0
%INFOSRVR-I-STARTED, LASTport/Disk server started.
$ InfoServer SHOW SERVER
Node BILBO [HP rx2600 (900MHz/1.5MB)] running OpenVMS XAR8-D2Y
LASTport/Disk Server Version 1.2
Max Services: 128 Write Quota: 0
Cache Buckets: 2048 Cache Bucket Size: 32 blocks
Cache Size: 33554432 bytes
Hits: 0 Hit Percentage: 0%
Misses: 0
Current Sessions: 0 Peak Sessions: 0
Read Write
Requests: 0 0
Blocks: 0 0
Errors: 0 0
Aborted: 0 0
Conflicts: 0 0
The first command in this example displays the current
information about the server. The second command starts the
server and increases the maximum number of services for the
server. The third command displays the new information about
the server, showing the increases maximum number of services.