Kofax Communication Server 9.1.1 - Manual (Page 76)

Environment Guide Version 3.00.04
76 © Copyright Kofax, Inc. All information is subject to change without notice.
The 3 other input fields (“average message size in bytes”, “fax line usage per message in seconds” and
“average number of pages”) have preset values which should be about right for an average installation.
The “peak message throughput per hour” value is calculated from the “fax line usage per message in
seconds
” input value and the number of lines.
Inbound link (KCS >> link >> link-specific mail system)
The inbound link column has only one input field “peak message throughput per hour”. If for example all
inbound fax messages are routed to an inbound link, the “peak message throughput per hour” figure of the
inbound fax column to the left can be copied in here. If all inbound fax messages are both printed by an IP
Printer and routed to a link take twice the message throughput value of the inbound fax column.
Outbound link (link-specific mail system >> link >> KCS)
The main input field of the outbound link column is the “peak message throughput per hour”. The
throughput of the outbound link may be set higher than the throughput of the outbound fax lines if the link is
expected to quickly put a number of messages into the KCS which are then sent out more slowly by the fax
lines.
The 2 other input fields (“average message size in bytes” and “average number of pages”) may be adapted
if required.
Outbound fax (KCS >> fax line)
The main input value of the inbound fax column is the number of fax lines. If the system has a group of fax
lines handling both inbound and outbound traffic (instead of dedicated inbound or outbound lines) one has
to estimate the ratio of inbound to outbound traffic and split the total number of lines accordingly. Check
also the sending log file configuration setting and the back-reception and delivery notification sending
options.
Adapt the 3 other input fields (“average message size in bytes”, “fax line usage per message in seconds”
and “average number of pages”) if the preset values do not fit. The “average message size in bytes” is the
size of the back-received documents, it only matters if the back-reception option is used.
The “peak
message throughput per hour ” value is calculated from the “fax line usage per message in seconds” input
value and the number of lines.
HW-Requirement Result
The result of the HW- Requirement calculation appears in the “disk writes per second” and “average disk
access time in ms” fields. It is assumed here that there are no disk reads because a sufficiently large
TCOSS disk cache has been configured, so the disk access time in milliseconds can be calculated from the
disk writes alone.
Before selecting a hard disk based on the disk writes per second add a “safety margin” of 50-100% to the
calculated figure, to allow for other use cases not taken into account by the HW-Requirement Calculator.
Also the KCS should not run on 100% disk usage in peak periods.
Hard Disk Performance Figures
Usually the hard disk access time can be looked up in the hard disk specification. The access time consists
of 2 parts: seek time and latency
average access time = average seek time + average latency