Troubleshoot/Problem Solving 139
Host I/O
When troubleshooting drive and connectivity faults, stop I/O to the affected disk groups from all
hosts as a data protection precaution. As an additional data protection precaution, it is helpful to
conduct regularly scheduled backups of your data. See also
Dealing with Hardware Faults
Ensure that you have obtained a replacement module of the same type before removing any faulty
IMPORTANT:
If the chassis system is powered up and you remove any module, replace it
immediately.
If the system is used with any modules missing for more than a few seconds, the chassis can
overheat, causing power failure and potential data loss. Such action can invalidate the product
warranty.
IMPORTANT:
Observe applicable/conventional ESD precautions when handling modules and
components, as described in
Avoid contact with midplane components, module connectors, leads, pins, and exposed circuitry.
Isolating a Host-Side Connection Fault
During normal operation, when a controller module host port is connected to a data host, the port’s
host link status/link activity LED is green. If there is I/O activity, the host activity LED blinks green. If
data hosts are having trouble accessing the storage system, and you cannot locate a specific fault or
cannot access the event logs, use the following procedures. This procedure requires scheduled
downtime.
IMPORTANT:
Do not perform more than one step at a time. Changing more than one variable at a
time can complicate the troubleshooting process.
Host-Side Connection Troubleshooting Featuring CNC Ports
The procedure below applies to controllers employing small form factor pluggable (SFP) transceiver
connectors in 4/8/16Gb/s FC, 10GbE iSCSI, or 1Gb/s iSCSI host interface ports. In the following
procedure, “SFP and host cable” is used to refer to any qualified SFP option supporting CNC ports
used for I/O or replication.
NOTE:
When experiencing difficulty diagnosing performance problems, consider swapping out one
SFP at a time to see if performance improves.
1
Halt all I/O to the storage system. See also
2
Check the host link status/link activity LED.
Summary of Contents for QXS G2 Series
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