Sun Storage 7000 Unified Storage System: How to Troubleshoot iSCSI Problems

Asset ID:	1-75-1398581.1
Update Date:	2018-05-04
Keywords:

Solution Type Troubleshooting Sure

Solution 1398581.1 : Sun Storage 7000 Unified Storage System: How to Troubleshoot iSCSI Problems

Applies to:

Sun ZFS Storage 7120 - Version All Versions and later
Sun Storage 7110 Unified Storage System - Version All Versions and later
Sun ZFS Storage 7320 - Version All Versions and later
Sun Storage 7210 Unified Storage System - Version All Versions and later
Sun Storage 7310 Unified Storage System - Version All Versions and later
7000 Appliance OS (Fishworks)

Purpose

To discuss this information further with Oracle experts and industry peers, we encourage you to review, join or start a discussion in the My Oracle Support Community - Disk Storage ZFS Storage Appliance Community

The purpose of this document is to assist in resolving iSCSI related problems with the Oracle ZFS Storage Appliance. This document assumes that the networking at the IP level is working correctly and will not cover the following areas:

Out of Scope
Generic Network Problems
iSCSI boot issues

If the problem is suspected to be a networking issue refer to the following document.
Document 1392086.1 Sun Storage 7000 Unified Storage System: How to Troubleshoot Network Problems.

If the problem is hosts booting from an iSCSI LUN on the ZFS Storage Appliance, please refer to the client's operating system's documentation first to determine if the problem is on the initiator side.

Solaris 10 iSCSI boot support
Document - TBD Oracle Solaris - Solaris 10 Known iSCSI Boot Issues
The RPE team has not yet published official documentation for Solaris 10u10 support of iSCSI boot.
Also, the below document should be prepared and linked to this document in future.
Document - TBD Oracle Solaris - Solaris 11 Known iSCSI Boot Issues

If the problem still exists and it is suspected to be caused by misconfiguration on ZFS Storage Appliance, then this document will check potential problems on the appliance side.

Troubleshooting Steps

iSCSI Configuration Examples:

The following documents guides you through step by step on how to set up iSCSI on given platforms. They are a good starting point for considerations when carrying out an initial configuration.

Also, please refer to following product documentation as well as online help.
Oracle ZFS Storage Appliance Product Documentation

Troubleshooting Steps to Follow:

Please validate that each troubleshooting step below is true for your environment.
The steps will provide instructions or a link to a document, for validating the step and taking corrective action as necessary. The steps are ordered in the most appropriate sequence to isolate the issue and identify the proper resolution. Please do not skip a step.

Step 1. Issue Clarification

First define what the problem is.
Which LUN is having problems and what type of problem are being experienced.

Refer to the following documentation for identifying the problems.

Document 1398582.1 Sun Storage 7000 Unified Storage System: iSCSI Troubleshooting - Identifying the Problem.

Step 2. Data Collection

In order to analyze further, it is useful to see the configuration information and system logs. The following documents guides you through what data can be collected for each component of iSCSI infrastructure.

Document 1400791.1 Sun Storage 7000 Unified Storage System: iSCSI Troubleshooting - Collecting Data.

Step 3. Cause Determination

Loss of connectivity to iSCSI shared LUNs may be due to:

- ZFSSA (target) side problem
- Host (initiator) side problem
- Network connectivity issues such as iSNS, DNS and/or RADIUS

For further information please refer to

Document 1401425.1 Sun Storage 7000 Unified Storage System: iSCSI Troubleshooting - Cause Determination.

A note on iSER

iSER (iSCSI Extention over RDMA) is used as a default method of iSCSI communication when you use Infiniband. Once iSER fails, we use IPoIB (IP over Infiniband) to run iSCSI on the top of IPoIB.
iSER equipments are transparently managed in iSCSI components such as under "configuration san initiators iscsi" on CLI.

Step 4. Correct Problems

Correct any configuration problems by referring to the product documents:

Oracle ZFS Storage Appliance Product Documentation

The Configuration: iSCSI sections of the appropriate System Administration Guide contains information on

How to configure the initiator IQN on ZFSSA
How to configure the target IQN on ZFSSA
How to add the initiator IQN to an initiator group.
How to add ZFS target IQN to a target group.
How to assign an initiator group and a target group to an iSCSI LUN
How to configure iSNS configuration

At this point, verify if your new configuration resolves the problem.
If the problem persists, contact to Oracle Support Services for additional support.

Refer to Document 1019887.1 Sun Storage 7000 Unified Storage System: How to collect a support bundle using the BUI or CLI.

for collecting data in the first instance which will assist the timely resolution of the issue.

Click to return to Document 1416406.1 Sun ZFS Storage Appliance Troubleshooting Resource Center.

*** Check for relevancy - 04-May-2018 ***

References

http://www.oracle.com/technetwork/server-storage/sun-unified-storage/documentation/iscsi-quickstart-v1-2-051512-1641594.pdf
<NOTE:1400791.1> - Sun Storage 7000 Unified Storage System: How to Collect Data for Troubleshooting iSCSI Issues
<NOTE:1401425.1> - Sun Storage 7000 Unified Storage System: iSCSI Troubleshooting - Cause Determination
<NOTE:1019887.1> - Sun Storage 7000 Unified Storage System: How to Collect a Support Bundle using the BUI or CLI
<NOTE:1398582.1> - Sun Storage 7000 Unified Storage System: iSCSI Troubleshooting - Identifying the Problem
<NOTE:1416406.1> - Sun ZFS Storage Appliances Troubleshooting Resource Center
<NOTE:1392086.1> - Sun Storage 7000 Unified Storage System: How to Troubleshoot Network Problems
HTTP://WWW.ORACLE.COM/TECHNETWORK/ARTICLES/SYSTEMS-HARDWARE-ARCHITECTURE/SS7000-SF-QUICKSTART-163901.PDF

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