brocade switch 14 m11 troubleshoot
TRANSCRIPT
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2006 Hewlett-Packard Development Company, L.P.
The information contained herein is subject to change without notice
SAN Troubleshooting
Module 11
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Objectives
Trace SAN problems
Gather troubleshooting data
Use switch commands to gather information
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About troubleshooting
Begin at the fabric
Determine if the problem is on the storage side or the host side
If a host cannot see a storage device, see if the storage device islogically connected to the switch
If the storage can be seen from the switch and the host still cannot
see the storage device, there is a problem between the host and the
switch
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Tracing problems
1. Determine what has changed
Has anything new been added/removed/reconfigured?
When was it working last?
2. Analyze physical system setup
Devices attached to switch ports
Diagram system configuration
3. Gather external switch information
Is the power LED on?
List the LED colors by port
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Analysis
Review log/traces
portLogShow/Dump
supportShow
Analyzer traces
Hardware
or
Software?
Hardware Software
Run diagnostics as
necessary
Based on analysis of initial information
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Common problem areas
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Troubleshooting tools
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High availability EVA environmentrecommendations
In high availability environments under heavy I/O loads
I/O timeouts might occur
Use pvchange to increase the IO_timeout value to no more
than 60 seconds for LUNs on an EVA 2.0
The increased IO_timeout value enables longer I/O completion
times and LUN access delays if a controller failover conditionoccurs
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Troubleshooting
switches
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Gathering troubleshooting data Finisar, Xyratec trace
(FC Analyzer) System configuration information
Switch
HBA
Storage device
Switch trace files usingsupportShow command
Routing outputs using
uRouteShow command
Front panel errors
Port log dump analysis
Fibre Channel configuration
Which ports are used? Which type of GBICs?
Chassis type and ID
Diagram of setup
Test results
Data patterns on traces
Document failure mode
Is failure easily reproducible?
Switch topology
Describe the network
configuration Is the switch cascaded?
How many switches are in the
configuration?
Are there parallel fabrics?
Dual host, storage connections?
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Helpful commands (1 of 2)
Name Command FunctionError Log errDump Displays the error log without page breaks
Switch Offline switchDisable Sets the switch to offline state necessary to run
certain diagnostics
Memory Test ramTest Checks CPU RAM. Run offline or online.
Port Register Test portRegTest Checks that the registers and static memory in
each ASIC can be successfully accessed. Run
offline.
Central Memory Test centralMemoryTes
t
Checks that the central memory in each ASIC
can be successfully accessed. Run offline.
Control Message
Interface Conn Test
cmiTest Verifies that control messages can be sent from
ASIC to ASIC. Run offline.
Content Addressable
Memory Test
camTest Verifies CAM functionality. Run offline.
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Helpful commands (2 of 2)
Name Command Function
Port Loopback Test portLoopback Test Checks all switch main board/hardware. Frames
transmitted are looped and received. Run offline.
Cross Port Test crossPortTest Checks al switch paths. Run offline or online.
Spin Silk Test spinSilk Checks all switch paths. Run offline.
SRAM Data
Retention Test
sramRetentionTest Verifies that data written into ASIC memory is
retained. Runs offline.
CMem DataRetention Test
CmemRetentionTest
Verifies that data written into ASIC SRAM isretained. Runs offline.
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errShow command
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switchshow command
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portshow command
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portstatsshow command
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supportshow command version
uptime
tempShow
psShow
licenseShow
diagShow errDump
switchShow
portFlagsShow
portErrShow
mqShow
portSemShow
portShow
portRegShow
portRouteShow
FabricShow
TopologyShow
qlShow
nsShow nsAllShow
cfgShow
configShow
faultShow
traceShow
portLogDump
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Hardware diagnostics commands
fanshow
psshow
tempshow
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Interpreting LED activity
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Rear panel LEDs
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Learning
check
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