Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access XP P9000 for Linux B.01.00.00

If a Raid Manager device group contains multiple items
where either the PVOL or SVOL devices reside on more than
a single P9000 Series array, then the Fence level must be
set to “data” in order to prevent the possibility of
inconsistent data on the remote side if an Continuous Access
link or an array goes down. The side effect of the “data”
fence level is that if the package is running and a link goes
down, an array goes down, or the remote data center goes
down, then write(1) calls in the package application will
fail, causing the package to fail.
NOTE: The Continuous Access Journal is used for
asynchronous data replication. Fence level ascyn is used
for a journal group pair.
HORCMINST This is the instance number of the Raid Manager that the
control script will communicate with. This instance of Raid
Manager must be started on all the nodes before this
package can be successfully started. (Note: If this variable
is not exported, Raid Manager commands used in this script
might fail).
HORCMPERM This variable supports the security feature, RAID Manager
Protection Facility on the Continuous Access devices. (Note:
If the RAID Manager Protection Facility is disabled, set this
variable to MGRNOINST. This is the default value).
HORCTIMEOUT (Default = 360)
This variable is used only in asynchronous mode when the
horctakeover command is run; it is ignored in
synchronous mode. The value is used as the timeout value
in the horctakeover command, -t <timeout>. The
value is the time to wait while horctakeover re-synchronizes
the delta data from the PVOL to the SVOL. It is used for
swap-takeover and SVOL takeover. If the timeout value is
reached and a timeout occurs, horctakeover returns the
value EX_EWSTOT. The unit is seconds.
In asynchronous mode, when there is a Continuous Access
link failure, both the PVOL and SVOL sides change to a
PSUE state. However, this change does not take place until
the Continuous Access link timeout value, configured in the
Service Processor (SVP), is reached. If the horctakeover
command is run during this timeout period, the horctakeover
command fails if its timeout value is less than that of the
Continuous Access link timeout. Therefore, it is important to
set the HORCTIMEOUT variable to a value greater than the
Continuous Access link timeout value. The default Continuous
Access link timeout value is 5 minutes (300 seconds). A
suggested value for HORCTIMEOUT is 360 seconds.
During package startup, the default startup timeout value of
the package is set to NO_TIMEOUT in the package ASCII
file. However, if there is a must set a startup timeout value,
then the package startup timeout value must be greater than
the HORCTIMEOUT value, which is greater than the
Continuous Access link timeout value:
Pkg Startup Timeout > HORCTIMEOUT >
Continuous Access link timeout value
58 Package attributes for Metrocluster with Continuous Access XP P9000 for Linux