Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 81)

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Troubleshooting
Dell™ PowerVault™ NAS Systems SCSI Cluster Installation and Troubleshooting Guide
This appendix provides troubleshooting information for Dell™ PowerVault™ NAS SCSI cluster configurations.
Table A-1 describes general cluster problems you may encounter and the probable causes and solutions for each problem.
Table A-1. General Cluster Troubleshooting
Problem Probable Cause Corrective Action
The RAID drives in the Dell™
PowerVault™ storage system
are not accessible by one of
the cluster nodes, or the
shared storage system is not
functioning properly with the
cluster software.
A disk resource will not move
over to another node or will
not come online.
The SCSI cables are loose or defective,
or the cables exceed the maximum
allowable length.
The PERC cards connected to a single
storage system are not configured
consistently.
The storage system is not running in
cluster mode.
If the cluster has multiple storage
systems, the cabling between the PERC
card and the storage systems is wrong.
Enclosure management modules
(EMMs) are not installed.
The PERC drivers are not installed in
your Microsoft® Windows® operating
system.
Check the cable connections or replace the cable
with a working cable. For more information on the
length of SCSI cables, see " Cabling Your Cluster
Hardware ."
Ensure that the RAID configuration is identical for
each channel between the PERC cards connected
to a shared storage system. Ensure that cluster
mode is enabled on both PERC cards and that
their SCSI IDs are different on each node.
Configure the storage system for cluster mode.
For more information, see " Preparing Your
Systems for Clustering ."
Ensure that the cables attached to each channel
of the PERC card in each server node are
connected to the correct storage system and that
the channels on an optional second PERC card in
each server node are connected to the correct
system.
Attach or replace the SCSI cable between the
cluster node and the shared storage system.
Install EMMs.
Install the drivers. See the appropriate PERC
documentation for more information.
The option to change the SCSI
IDs is not visible in the PERC
BIOS.
Cluster mode is not enabled. Enabling cluster mode will permit you to change
the SCSI IDs.
One or more of the SCSI
controllers are not detected by
the system.
PERC cards hang during boot.
The controllers for the shared storage
system have the same SCSI ID as their
peer adapters in the other system (that
is, the same SCSI ID as the controllers
connected to the other side of the
shared storage system).
Change one of the controller SCSI IDs so that the
ID numbers do not conflict. Set the controller in
the primary node to SCSI ID 7 (default), and set
the controller in the secondary node to SCSI ID 6.
See the appropriate PERC documentation for more
information about setting SCSI host adapter IDs.
Dell OpenManage™ Array
Manager and the PERC BIOS
utility only report 13 drives in
cluster mode.
Normal The SCSI ID limitations are imposed by SCSI
protocol. As a result of this limitation, the last slot
in the storage system cannot be utilized in cluster
mode.
One of the nodes takes a long The node-to-node network has failed Check the network cabling. Ensure that the node-