Unquiescing A Server When Server Count Is Low - Coyote Point Systems E350GX Installation And Administration Manual

Chapter 6: Administering Virtual Clusters

Unquiescing a Server When Server Count is Low

Let's say we have a cluster that has three servers,
• We want and
sv00
other two are running.
• If one (or both) of the active servers becomes unavailable, we want to disable the
so it starts serving traffic.
• Once the original two active servers are available again, we want to quiesce the third server.
The above can be accomplished by constructing two Smart Events:
: If there are less than two servers active, unquiesce
Event 1
: If there are three servers active, quiesce
Event 2
To create , do the following:
Event 1
1. Right-click on the cluster name in the left frame and select
2. Type a for the event, such as
Name
expression editor.
Event Trigger
3. In the field, click on the following controls:
operators
a.
active_servers
b. the 'less than' operator (
c.
numeric
The
expression workbench
4. In the
expression workbench
the text box and then click
numeric value
5. At the top of the
Add New Event
editor:
6. In the field, click on
functions
7. In the
expression workbench
dialog and click
accept
8. In the field, click on
operators
9. In the field, click on
functions
10. In the
expression workbench
message text box that appears:
There are fewer than two servers active. sv02 has been unquiesced.
170
sv00
to actively serve traffic, and
sv01
sv02
unquiesce-sv02
).
<
field should now look like this:
field, click on the drop-down arrow shown in the blank parameter. Type '
accept
popup window, click the Next icon (
.
unquiesce
field, click on the drop-down arrow next to
.
.
&&
.
log
field, click on the drop-down arrow next to
, , and :
sv01 sv02
to have the
sv02 quiesce
and print a log message.
sv02
and print a log message.
from the popup menu.
Add Event
, or accept the default. Click the Next icon (
.
). This displays the
>
unquiesce
log(
Equalizer Installation and Administration Guide
option enabled while the
option on
quiesce
) to open the
>
2
Event Action
. Select in the popup
sv02
"" . Type the following into the
)
sv02
' into