HP 3PAR Operating System Software - Manual (Page 156)

20 Error Handling
See the following: For information about:
“Synchronization States” (page 156) Volume synchronization states
“Timeouts for Remote-Copy Failure” (page 156) The timeout periods per type of failure and volume group
mode
“Failure of a Single Link” (page 157) The effect of one link failing
“Target failure” (page 157) What happens when all links in a remote-copy pair fail
“Failure of a Storage System” (page 159) How remote copy handles system failures
“Write Errors” (page 159) Different types of write errors
“Read Errors” (page 160) Different types of read errors
For additional information, see “Recovering from Disaster” (page 162)
Synchronization States
The following synchronization states for virtual volumes are displayed in remote-copy output:
•
New —Remote copy for the primary virtual volume has not started.
•
Syncing —Remote copy is currently synchronizing the secondary virtual volume with the
primary.
•
Synced —The primary and secondary virtual volumes are currently in sync (for asynchronous
periodic mode volumes, the output displays the last synchronization time).
•
NotSynced —The primary and secondary virtual volumes are not in synchronization.
•
Stopped —The volume group is stopped. The primary and secondary virtual volumes were
in synchronization the last time the group was in the Started state, but might be out of
synchronization now.
•
Stale —The secondary virtual volume has a valid point-in-time copy of the primary volume;
however, the last attempt at synchronization failed.
•
Failsafe —In the event of a network failure that prompts a failover, any primary volumes
will be placed into a failsafe state to prevent data corruption and inconsistency between
primary and secondary volumes.
NOTE: The Failsafe state is relevant only to volumes that have matching WWNs. If the
secondary volumes were created using the admitrcopyvv –createvv option, it will affect
these groups.
Timeouts for Remote-Copy Failure
HP 3PAR Remote Copy uses two main timeouts to send alerts about link and system failures. The
timeout period depends on the mode of the volume group.
Timeout Period: Periodic Timeout Period: Synchronous Function Timeout
60 s 10 s Remote copy declares an
unresponsive link down. link heartbeat timeout
200 s 10 s Remote copy declares a
target system down after all
links have gone down. target timeout
156 Error Handling