HP StorageWorks Continuous Access EVA Administrator Guide (T3687-96043, December 2005)

Ta b l e 3 When to fail over a DR group, manag ed set, or array
Recommended ac
tion
Failure situat
ion
DR group in normal mode
DR group in failsafe mode
Maintenance requiring loss of
access to source array
Perform Planned failover on destination array.
Total loss of so
urce array
Loss of both source controllers
Manually inter
vene to fail over data on destination array, and then
restart proce
ssing at the destination arra y. Perform anUnplanned
failover).
Loss of single source controller
Failover not necessary.
Total destination array loss
Loss of both d
estination controllers
Loss of all intersite links
Failover not necessary. Manually intervene to continue
processing at source array.
Resume operations from
failsafe-locked condition after
destination loss.
Loss of source interswitch links Manually intervene to fail over data on destination array, and then
restart processing at the destination array. Perform an Unplanned
failover)
.
Loss of single source intersite
switch
Failover not necessary.
Extended power outage at primary
site
Manually intervene to fail over data to destination array, then restart
processing at the destination array. Perform an Unplanned failover).
Loss of a m
anaging server
Failover not necessary. Browse to standby managing server.
Loss of single disk in redundant
storage
Failover not necessary.
Loss of single host of cluster
Failover not necessary.
Disk grou
p hardware failure (loss
of redundancy) on the source
array
Fail over
to destination, and repair the array. Perform the procedure for
Disk grou
p hardware failure on the source a rray).
Disk group hardware failure (loss
of redundancy) on the destination
array
Failover not necessary. Perform the procedure for Disk group hardware
failureonthedestinationarray).
Planned failover
Possible scenario: Due to scheduled maintenance at the local site, you need to move operations from the
local array to the remote array.
Action summary: Prepare the local a rray and fail over the rem ote array. When the failover is complete,
you can continue to operate from the new source and engage failsafe mode as desired. When the
planned maintenance is complete, you can fail back to the original source. Figure 8 diagrams a planned
transfer of operations to a remote site.
HP StorageWorks Continuous Access EVA administrator guide
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