does the shared memory get lost when the master node
which serves it crashes,
suppose i had configured a secondary masters which
takes over the services of the first node ,in case of
failure, will it(the second node) be able to get the
same memory contents...will not the contents of memory
also) go down with the first node.
ok...if it does get lost ..is there any way we can
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From: Brian J. Watson <Brian.J.W<atson@hp...> - 2003-03-19 18:33:16
luqman kondeth wrote:
>does the shared memory get lost when the master node
>which serves it crashes,
Yes. There's currently no mechanism for mirroring or rebuilding the
shared memory on another node.
Note that the shared memory is not necessarily served from the CLMS
master node. OpenSSI algorithms are much more distributed than that.
Instead, a shared memory segment is served from the node where it is
created. This allows shared memory performance to be as good as the base
until a process migrates away from its shared memory segment.
>ok...if it does get lost ..is there any way we can
If a process loses its shared memory segments in an OpenSSI cluster, it
receives errors or signals to indicate that the segment is no longer
valid. This situation is a problem for the process, but the cluster
itself can continue operating without trouble. If you'd like to avoid
this situation, don't let processes migrate away from their segments. It
would still be possible you could lose the shared memory, but you'd also
lose the process using it.