[Linux-ha-dev] SFEX resource agent for heartbeat
hxinwei at gmail.com
Thu Oct 16 03:28:54 MDT 2008
Attached is a rewritten version of sfex. It can be applied to tip of
Here's some explanation about the changes and design notes on it.
. The fundamental algorithm of sfex is kept untouched, except that
it's a background deamon now.
. The memory allocation in original version is correct but
confusing. So all calls malloc are replaced with one call to
posix_memalign, and daemon avoid to allocate extra memory after
. The on disk meta-data works well, but again, very confusing. All
integers are converted to/from strings before/after saving/loading
to/from disk. I add new structs to represent the on disk formats. It
helps to remove all confusing offset.
. sfex_daemon will be installed into /usr/lib/heartbeat/ and
sfex_init into /usr/sbin
. sfex_* use syslog & stderr
. sfex implements an exclusive mode to help to control the shared
disk. It's a cooperative and advisory protocol only. I think it's not
possible to implement a shared-mode based on advisory protocol only.
The idea of SBD can be borrowed in as a workaround, but it's more
reasonable to do that as a STONITH plugin then a resource agent.
Junko helps to review the code again, but any bugs you found should
be my fault.
Please kindly review the patch and give your comments.
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