Solaris Commands Question:
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What is the significance of 51% state database replicas in SVM?
Answer:
A state database is the collections of multiple,
replicated database copies and each copy is considered as a
state database replica.
If the solaris box loses a state database replica, SVM
should figure out which state database replicas still
contain valid data and boot using the valid ones and this
is achieved by using “majority consensus algorithm” and
according to this algorithm we need half+1 number of state
database replicas before it finds for a valid data.
And for the above reason we need to recreate at least three
state database replicas when we setup a disk configuration.
If all the three database replicas are corrupted meaning we
lose all data stored on svm volumes.
Hence its good to create as many replicas on separate
drives across controllers.
replicated database copies and each copy is considered as a
state database replica.
If the solaris box loses a state database replica, SVM
should figure out which state database replicas still
contain valid data and boot using the valid ones and this
is achieved by using “majority consensus algorithm” and
according to this algorithm we need half+1 number of state
database replicas before it finds for a valid data.
And for the above reason we need to recreate at least three
state database replicas when we setup a disk configuration.
If all the three database replicas are corrupted meaning we
lose all data stored on svm volumes.
Hence its good to create as many replicas on separate
drives across controllers.
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