HP StorageWorks Continuous Access EVA Administrator Guide (T3687-96043, December 2005)
0c1e5f0c: Severity: Critical – failure or failure imminent. The members
of the specified Source Data Replication Group have not been presented to
the host because the remote Storage System is not accessible. To resolve this
situation, you can:
• Fail over the destination DR groups and present the virtual disks from the new source to the desired
hosts. With this option, any data in the DR group log o n the previous source array is lost. When
communication is restored, the new source array will update the previous source (new destination)
and any data written to the previous source in the interim will be overwritten.
• Using HP Command View EVA or HP Replication Solutions Manager, manually suspend replication
on each affected DR group, and the controller software will automatically re-present the virtual disk
members. When the links are repaired, allow the DR group m erge process by selecting each DR
group and manually resuming replication. For the procedures to suspend and resume replication, see
HP Command View EVA or HP Replication Solutions Manager online help.
LUN inaccessible to host
A"stalledL
UN" event (4206001b) in HP Command View EVA indicates that a LUN has been
inaccessible to the host for at least four minutes, causing the LUN to be in a quiesced state. Take the
following actions to troubleshoot this situation and prevent possible data loss:
1. Verify that the host still cannot access the LUN.
2. Try to resynchronize the controller from the H P Command View EVA field service pa ge.
3. If the situ ation still exists, unpresent and re-present the LUN to the host.
4. If the sit
uation still exists, restart the controller and its partner controller, i f necessary.
Remote server cannot detect a destination LUN
If you have a remote server that cannot detect a destination LUN, it could be that the DR group access
mode is set to "disabled." A remote server can detect a LUN with a "read–only" a cc ess mode, but cannot
detect it if the mode is set to "disabled." The replication manager allows you to change the D R group's
access mode from "disabled" to "read–only," thereby allowing the remote server to detect the destination
LU N. See the online help for information on editing a D R group's properties.
DR groups in unknown state
If your DR groups are in a n unknown state, check to see if you have recently imported the replication
manager database from an active management server to the manag em ent server where the DR groups
are in an unknown state. If so, the problem is probably that the passwords do not m a tch on the
manag
ement servers.
Tunnel thrash
Tunnel thrash is the frequent closing and opening of a tunnel while holding host I/O in the transition. This
occurs when peer controllers can see each other, but cannot sustain replication data with any path, even
when throttled to the minimum. Some possible causes of tunnel thrash are :
• High volumes of packet loss
• Inc orrectly configured routers
• Re–routed IP circuits
• Oversubscribed circuits
Although tunnel thrash is rare, a critic a l event (c23670c) is generated and displayed in HP Command View
EVA for each D R group that shares the affected tunnel. You must intervene to prevent possible data loss.
Take the following actions to resolve this situation:
• Check all routers and look for high volumes of packet loss.
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Troubleshooting