StorageWorks Command Console Agent in a TruCluster Environment Application Note

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StorageWorks

Command Console

Agent in a TruCluster

Environment

Application Note

EK-SMA41-AN. A01

Visit Our Web Site for the Latest Information

At Compaq, we are continually making additions to our storage solution product line. Please check our

web site for more information on our fibre channel product line as well as the latest drivers, technical

tips, and documentation. Visit our local web site at:

http://www.compaq.com/storageworks

Introduction

The following is an example of how to set up the SWCC Agent on Tru64 UNIX V4.0F running

TruCluster V1.6. It is meant to act as a guide for setting up the Agent for High Availability. The

StorageWorks Command Console (SWCC) Agent can be set up many different ways and this needs to

be taken into consideration when reviewing this application note.

1. Important Considerations

• What is the hardware configuration?

• Are the correct software/firmware versions installed?

• Does the SWCC Agent need to have failover capability?

• Is it desirable to have the Agent running on multiple nodes concurrently?

Hardware Considerations

What model StorageWorks RAID arrays make up the system? Are they all HSG80s or is there a

mix of StorageWorks models?

Software Versions

Are the software versions correct? This application note deals with Tru64 UNIX V4.0F with

TruCluster V1.6 software. Insure that the HS* controllers are running the latest firmware. For

more information go to www.compaq.com/support and follow the links to open vendor storage.

Failover Capability

Does the Agent need to have High Availability? The best way to accomplish this is by creating an

ASE service to accomplish a failover, if one is required.

Summary of content (8 pages)

PAGE 1
StorageWorks Command Console Agent in a TruCluster Environment Application Note EK-SMA41-AN. A01 Visit Our Web Site for the Latest Information At Compaq, we are continually making additions to our storage solution product line. Please check our web site for more information on our fibre channel product line as well as the latest drivers, technical tips, and documentation. Visit our local web site at: http://www.compaq.
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Shared Storage Solutions Using Fibre Channel Hubs Agent Running on Multiple Nodes Concurrently Is it desirable to have the Agent running on multiple nodes concurrently? If the user is running HSG80s with ACS firmware V8.5 or higher EXCLUSIVELY, it is possible to run more then one agent concurrently in a cluster. This is due to a new locking feature built into the V2.2 Agent and the ACS V8.5 firmware. 2. Running the SWCC Agent on a cluster.
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Application Note There are two major steps to creating an ASE Service. The two steps are: 1) create the “start”/”stop” scripts; and 2) create the service. You can accomplish both the steps by running the “asemgr” and creating the start/stop scripts inline. However, it is probably more practical to create the start/stop scripts first and then run the asemgr to finish creating the service.
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Shared Storage Solutions Using Fibre Channel Hubs # PATH=.:/etc:/bin:/usr/bin:/usr/ucb:/sbin export PATH SD="/usr/opt/SWCC220/bin/steamd" grep -qsw steam /etc/inittab if [ $? -eq 0 ] then sed ’/steamd/d’ /etc/inittab > /etc/inittab.tmp mv /etc/inittab.tmp /etc/inittab init q else exit 0 fi With the Start/Stop scripts created and tested, complete the process by using the “asemgr” utility to create the service. Below is a sample session with comments italicized.
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Application Note q) x) Quit (back to Managing ASE Services) Exit ?) Help Enter your choice [q]: a Adding a service Select the type of service: 1) 2) 3) 4) 5) NFS service Disk service User-defined service DRD service Tape service q) x) Quit without adding a service Exit ?) Help Enter your choice [1]: 3 / Pick “3” even though the tendency would be to pick “2” a disk service. One reason for not picking “2” is that this option wants to reserve a specific disk device.
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Shared Storage Solutions Using Fibre Channel Hubs Enter the full pathname of your start action script or "default" for the default script (x to exit): /usr/opt/SWCC220/scripts/steamstart / This is the absolute path to the script illustrated previously.
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Application Note Modifying user-defined scripts for ‘steam‘: 1) 2) 3) 4) 5) x) Start action Stop action Add action Delete action Check action Exit - done with changes Enter your choice [x]: x Selecting an Automatic Service Placement (ASP) Policy Select the policy you want ASE to use when choosing a member to run this service: b) f) r) Balanced Service Distribution Favor Members Restrict to Favored Members ?) Help Enter your choice [b]: b / Balanced will relocate steam to the least busy node should it
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Shared Storage Solutions Using Fibre Channel Hubs c) r) on) off) res) s) a) q) x) Service Configuration --> Relocate a service Set a service on line Set a service off line Restart a service Display the status of a service Advanced Utilities --> Quit (back to the Main Menu) Exit ?) Help Enter your choice [q]: q TruCluster Production Server (ASE) ASE Main Menu a) m) s) Managing the ASE Managing ASE Services Obtaining ASE Status x) Exit --> --> --> ?) Help Enter your choice: x tincp4> If everything