Brocade Communications Systems 1606 Administrator's Manual page 215

TABLE 10
General errors and conditions
Problem
Searching or viewing key IDs on an LKM server returns "Not
Responding" or "Unknown/Busy" for 20 or more minutes
while searching for decommissioned key records.
Decommissioning an R2 LUN (remote replication LUN) fails
with a "Decommission LUN failed because of failure in
over-writing metadata" error message.
When a Brocade 7600 application platform is in the data
path, I/O errors may be encountered before reaching the
scalability limit of 512 LUNs with 16 outstanding I/Os.
A performance drop occurs when using DPM on a Microsoft
Windows system to back up to a Scalar 500i tape library.
Continuous "Unrecoverable data compression failure" error
messages are observed on the console following a High
Availability Cluster failback.
Fabric OS Encryption Administrator's Guide
53-1001864-01
General encryption troubleshooting I
Resolution
In cases where there are many keys to search through (e.g., one MB or more)
LKM database searches may get queued and may not get serviced fast
enough, and the request times out. There is no workaround other than
retrying.
Check the R2 LUN (remote replication LUN) state. If it is in "Disabled (Data
Decommissioning Failed" state, it indicates that the partner R1 (local) LUN
was decommissioned with the R1 and R2 LUNs in sync.
To decommission the R2 LUN, take the following steps:
1 Split the mirror relationship so each LUN can be independently
decommissioned.
2 Write enable the LUN.
3 Decommission the LUN.
There is no workaround other than reconfiguring so that the 7600 and the
encryption switch/blade are not in the same data path.
Change the DPM behavior to send one request at a time by adding DWORD
"BufferQueueSize" under
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Data Protection
Manager\Agent, and set the value to 1.
Then restart DPM servers: MSDPM, DPMLA, DPMRA.
This is an expected behavior, and you may ignore the messages.
If any risk of data corruption is detected, the LUN is disabled, and you are
informed and prompted to refresh the Data Encryption Key (DEK).
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