HP Serviceguard Extended Distance Cluster for Linux A.01.00 Release Notes, Second Edition, May 2008

HP Serviceguard Extended Distance Cluster for Linux Release Notes
Known Problems and Workarounds
Chapter 118
Disks are resynchronized at all times
• What is the problem?
When data on two disks is not synchronized, Software RAID
resynchronizes the entire disk, rather than only updating the
changed data. This may happen even after a basic cluster failover.
• What is the workaround?
There is no workaround as this is expected behavior with an MD
driver.
MD parameters in the package control script
• What is the problem?
The package control script has a few MD related parameters.
• What is the workaround?
Earlier versions of HP Serviceguard supported MD as a
multipathing software. As a result, the package control script
includes certain configuration parameters that are specific to MD. Do
not use these parameters to configure XDC in your environment.
Following are the parameters in the configuration file that you must
not edit:
# MD (RAID) CONFIGURATION FILE
# Specify the configuration file that will be used to define
# the md raid devices for this package.
# NOTE: The multipath mechanisms that are supported for shared storage
# depend on the storage subsystem and the HBA driver in the
# configuration. Follow the documentation for those devices when setting
# up multipath. The MD driver was used with earlier versions of
# Serviceguard and may still be used by some storage system/HBA
# combinations. For that reason there are references to MD in the
# template files, worksheets, and other areas. Only use MD if your
# storage systems specifically calls out its use for multipath.
# If some other multipath mechanism is used (e.g. one built