ServerNet Cluster Manual

ServerNet Cluster Description
ServerNet Cluster Manual—520575-003
1-42
Expand
The following list summarizes information about the line-handler process:
The Expand-over-ServerNet line-handler process manages security-related messages
and forwards packets outside the ServerNet cluster. Other messages, such as
incoming and outgoing data, usually bypass the Expand-over-ServerNet line-handler
process and are handled directly by the ServerNet X fabric and Y fabric and the
message system. This is known as Expand bypass mode.
The Expand-over-ServerNet line-handler process is similar to the Expand-over-FOX
line-handler process. However, for Expand-over-ServerNet lines you configure a
subtype code of 4 and use the PEXPSSN profile. The ASSOCIATEDEV parameter
contains the name of the SNETMON process, $ZZSCL.
Like the Expand-over-FOX line handler process, the Expand-over-ServerNet line
handler process can support only a single line and a single neighbor system. So the
Expand-over-FOX line-handler process and the Expand-over-ServerNet line handler
process are always separate processes with different logical devices (LDEVs).
Super Time Factors
Expand Time Factors (TFs) are numbers assigned to a line, and reported for a path
and a route, to indicate efficiency in transporting data. The lower the TF, the more
efficient the line, path, or route. Previous TFs have defined FOX lines as the fastest
communication medium between servers. Prior to Expand-over-ServerNet, the highest
line speed supported was 224 Kbps.
Super Time Factors allow Expand network routing to have a faster transport medium
between systems than a FOX line. Super Time Factors allow the extension of the
automatically calculated TFs to line speeds greater than 224 Kbps.
If two systems are linked by more than one type of Expand line (for example, Expand-
over-ServerNet and Expand-over-FOX), the time factor determines which line is faster.
HP recommends setting the SPEEDK parameter to SNET, which makes it the fastest
line. The ServerNet cluster transport is preferred because of its high bandwidth.
Description Expand-over-ServerNet line-handler process
Type 63
Subtype 4
Profile PEXPSSN
ASSOCIATEDEV
Default
$ZZSCL (SNETMON)