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Server Shadowing and Recovery
B.9 Server States
Figure B–2 Server States
WAIT−TR−OK
WAIT−TR−RETRY
Retry
Router detects
definition clash
Propose KR
to Routers
Error
Proposal accepted
− commit KR
ACTIVE
REMEMBER
CATCHUP
WAIT
CATCHUP
SECONDARY
WAIT−JNL
WAIT RESTART
RESTART
Router sends
list of recovery
Journals
STANDBY
SECONDARY
STANDBY
KR already
active on
another CPU
Secondary
already active
in cluster
Primary site
failure
Primary node
failure
Inaccessible
Journal
Journal
becomes
accessible
RECOVERING
WAIT−RVY
Inaccessible
Journal
Journal
becomes
accessible
Primary
active
No Primary
No Secondary
Journal recovery
data found (if any)
Journal recovery
data found (if any)
Inaccessible
Journal
Journal
becomes
accessible
Primary
active
Secondary is
ready
Primary
failure
Secondary
node failure
Legend:
KR Key range
TX Transaction
TR TX Router
CDS 8−NOV−1991 17:23:35
Non−shadowed
Primary
Server declaration
rejected
DD
INITIAL
WAIT_QUORUM
Propose KR
to Routers
Backend not
yet quorate
Server Shadowing and Recovery B–7