Galaxy Metal Gear 65 G.7 Locking the Cache Setting

Galaxy 65 User Guide

204

G.7 Locking the Cache Setting

You can prevent host systems from using SCSI mode-select commands to change the Galaxy 65

Subsystem’s write-back cache setting. Some operating systems disable write cache. If cache lock is

enabled, the host cannot modify the cache setting. The default setting is disabled.

This option is useful in some environments where the host system disables the SM module’s write-back

cache, resulting in degraded performance. A change to this setting on either SM module is automatically

updated on the other SM module.

To lock the cache setting:

1From the System Menu, select Configuration Menu and press Enter.

The Configuration Menu displays.

2Select Option Configuration and press Enter.

The Option Configuration screen displays.

3Select Cache Lock and press Enter.

The Cache Lock screen displays. The current setting is marked with an * next to it.

Contents

Main Notices Contents Page Page Page Page Page Page Page Preface International Standards Potential for Radio Frequency Interference European Regulations Safety Page Battery Safety Laser Safety Rack System Precautions ESD Precautions Data Security Special Tools and Equipment Related Documentation Conventions Page Page Page Page 1.2 The Enclosure Core Product 1.2.1 Enclosure Chassis Page 1.3 The Plug-in Modules 1.3.1 Power Supply/Cooling Module 1.3.1.1 Multiple Power Supply/Cooling Modules 1.3.2 Operators Panel 1.3.2.1 Ops Panel Indicators and Switches 1.3.3 Loop Resiliency Circuit Input/Output Module (FC-AL) Page Page 1.3.4 Drive Carrier Module 1.3.4.1 Drive Status Indicators 1.3.4.2 Anti-tamper Locks 1.3.5 Dummy Carrier Modules 1.4 Visible and Audible Alarms 1.5 Installing your Galaxy 65 Subsystem 1.6 Galaxy 65 Technical Specification Tower: 1.6.3 AC Power (450W PSU) 1.6.1 Dimensions 1.6.4 PSU Safety and EMC Compliance 1.6.5 Power Cord 1.6.6 Environment 1.6.7 Interfaces 1.6.8 Drive Carrier Module Specification see SFP manufacturers specification. Expansion SFP Cable length: as above 1.6.9 Galaxy 65 FC-AL LRC I/O Module Specification 1.6.10 RAID Card 1.6.11 Software Enclosure Services (SES) Support Chapter 2 Operation 2.1 Before You Begin 2.2 Power On 2.2.1 Power Supply/Cooling Module LEDs 2.3 Ops Panel LEDs Page 2.4 Starting the Drives 2.4.1 Disk Drives LEDs 2.5 Power Up/Down Chapter 3 Galaxy 65 RAID Management 3.1 Managing Arrays and Partitions Using SAM 3.2 Managing Arrays 3.3 Viewing Array and Drive Status Information 3.3.1 Viewing Array and Partition Statistics 3.3.1.1 Resetting All Statistics 3.3.2 Verifying an Array 3.3.2.1 Stopping the Array Verification Process 3.3.3 Changing Array Ownership 3.3.4 Changing an Array Name 3.3.5 Trusting an Array 3.3.6 Deleting an Array 3.4 Managing Partitions 3.4.1 Viewing Partition Status Information 3.4.2 Changing a Partition Name 3.4.3 Changing a Partition LUN 3.4.4 Controlling Partition Access 3.4.4.1 Viewing Known WWNs 3.4.4.2 Creating Nicknames for Host WWNs To add a new host that is not listed To change a host nickname that is listed 3.4.4.3 Configuring InfoShield 3.4.5 Changing the Read-Ahead Cache Size 3.4.6 Deleting a Partition Page Chapter 4 System Status 4.1 Monitoring System Status Using SAM 4.2 Setting Up Remote Notification 4.2.1 Starting and Stopping Remote Notification 4.2.2 Setting Up the Events to be Monitored 4.2.3 Setting Up the E-mail Addresses 4.3 Saving Log Information to a File 4.4 Displaying Overall Statistics 4.4.1 Resetting the All Statistics Page Chapter 5 Configuring the Galaxy 65 System 5.1 Configuring the LAN-related Settings 5.1.1 Configuring the Telnet Timeout 5.1.2 Configuring the SNMP Settings 5.1.3 Configuring the System Information 5.1.4 Setting Passwords 5.1.5 Configuring the Security Options 5.2 Changing the Date and Time 5.3 Understanding LUNs and Viewing LUN Information 5.3.1 Viewing LUN Information 5.4 Changing Management LUNs 5.5 Changing the Alarm Mute Setting 5.6 Controlling Host Access to the Galaxy 65s Write-back Cache Setting Galaxy 65 Subsystem internal temperature 5.7 Enabling and Disabling the Battery 5.8 Changing the Utility Priority 5.9 Rescanning All Ports 5.10 Pausing I/O 5.11 Saving and Restoring a Configuration File 5.11.1 Saving a Configuration File 5.11.2 Restoring a Configuration File Page 5.12 Viewing and Restoring Default Settings 5.12.1 Viewing Default Settings 5.12.2 Restoring Default Settings 5.13 Updating Software Page Chapter 6 Managing Disk Drives & Enclosures 6.1 Managing Disk Drives 6.1.1 Displaying Disk Drive Information 6.1.1.1 Displaying All Devices 6.1.1.2 Viewing Disk Drive Status 6.1.2 Clearing Metadata from a Disk Drive 6.1.3 Enabling and Disabling Write-back Cache 6.1.4 Displaying Disk Drive Cache Status 6.1.5 Enabling and Disabling SMART Changes 6.1.6 Blinking a Drive LED 6.1.7 Taking Down a Disk Drive 6.1.8 Testing a Disk Drive 6.2 Managing Enclosures 6.2.1 Setting the EMP LUN 6.2.2 Changing the Additional EMP Setting Chapter 7 Troubleshooting and Problem Solving 7.1 Overview 7.1.1 Initial Start-up Problems 7.1.1.1 Faulty Cords 7.1.1.2 Alarm Sounds On Power Up 7.2 LEDs 7.2.1 Power Supply/Cooling Module 7.2.2 Ops Panel 7.3 Audible Alarm 7.3.1 Audible Alarm Mute 7.4 Troubleshooting 7.4.1 System Faults 7.4.2 Power Supply/Cooling Faults 7.4.3 Thermal Control 7.4.4 Thermal Alarm 7.5 Drive Carrier Module Faults 7.5.1 Dummy Carrier Modules 7.5.2 Auto Start Failure 7.6 Dealing with Hardware Faults 7.7 Continuous Operation During Replacement 7.8 Problems Accessing the Galaxy 65 Subsystem Using the Ethernet Port 7.9 Host Fibre Channel Problems 7.10 Array Problems 7.10.1 Changing the Backoff Percent Using SAM 7.10.2 Changing the Backoff Percent Using the Disk Array Administrator 7.11 Galaxy 65 Subsystem Problems 7.12 Replacing a Module 7.12.1 Power Supply/Cooling Modules 7.12.1.1 Removing a PSU Module 7.12.1.2 Inserting the Module Page Page 7.12.2 Ops Panel 7.12.3 Storage Manager Module 7.12.3.1 Removing the Module Page 7.12.4 Insertion/Removal of SFP Modules 7.12.5 Battery Replacement 7.12.6 Drive Carrier Module 7.12.6.1 Removal and Replacement 7.13 Problems During Startup (When Using the Disk Array Administrator) 7.14 Terminal Emulator and COM Port Problems 7.15 Warning and Error Events 7.15.1 Warnings Page 7.15.2 Errors 7.16 Setting Up and Viewing the Debug Log 7.16.1 Summary of Debug Log Capabilities 7.16.2 Collecting Debug Logs 7.16.2.1 SAM: Manage/Utilities/Debug Utilities/Save Debug Logs/Save Log Files 7.16.2.2 Disk Array Administrator on Controller A: Utilities Menu 7.16.3 Configuring Debug Logs 7.16.4 Using SAM to Set Up and View the Debug Log 7.16.5 Using the Disk Array Administrator to Set Up Debug Logging 7.17 Using the Loader Diagnostics Menu 7.18 Using the Loader Utility Menu 7.19 Understanding Disk-related Errors 7.19.1 Disk Errors 7.19.2 Disk Channel Errors 7.19.3 Voltage and Temperature Errors and Warnings 7.20 Slow Write Performance 7.21 Spare Parts and Ancillary Items 7.22 Upgrading Your LRC I/O Modules Page Appendix A Array Basics A.1 Array Types A.1.1 RAID 0 (Striped Disks) A.1.2 RAID 1, RAID 10 (Mirrored Disks) A.1.3 RAID 3 A.1.4 RAID 4 A.1.5 RAID 5 A.1.6 RAID 50 A.1.7 Volume Sets A.2 Comparing RAID Levels A.3 Mixing Disks from Different Manufacturers or with Different Capacities Page Appendix B Accessing Disk Array Administrator Software B.1 Accessing the Disk Array Administrator Using the RS-232 Serial Port Page Page B.2.2 Accessing the Disk Array Software Using the Ethernet Port Page B.3 Navigating the Disk Array Administrator Software B.3.1 Changing the Screen Display Accessing DAM 103 B.3.2 Disk Array Administrator Menu Tree Figure 21 Menu Tree (sheet 1) Galaxy 65 User Guide Figure 22 Menu Tree (sheet 2) 104 Appendix C Creating and Managing Arrays & Partitions C.1 Creating Arrays C.1.1 Creating a Single-Partition Array The Enter Array Name screen displays. Page Page Page Page C.1.2 Creating a Multiple-Partition Array Page Page Page Page C.2 Managing Arrays C.2.1 Viewing Array and Drive Status Information C.2.1.1 Viewing Array Status Page C.2.1.2 Viewing Drive Status C.2.2 Stopping the Array Initialization Process C.2.3 Adding a Partition Page C.2.4 Verifying an Array Page C.2.4.1 Viewing Verification Status C.2.4.2 Stopping the Verification C.2.5 Reconstructing an Array C.2.6 Expanding Array Capacity Page Page C.2.6.1 Viewing Expand Status C.2.7 Changing an Array Name C.2.8 Changing Array Ownership C.2.9 Trusting an Array C.2.10 Deleting an Array Page C.3 Managing Partitions C.3.1 Understanding Partitions Free space Partition 1 Free space C.3.2 Viewing Partition Status Information C.3.2.1 Viewing Partition Status Partition 1 Partition 2 Partition 3 Partition 4 Partition 5 Partition 1 Partition 2 Partition 3 Partition 4 Partition 5 Free space Page C.3.2.2 Viewing Partition Statistics Page C.3.2.3 Resetting Partition Statistics C.3.3 Expanding a Partition C.3.4 Changing a Partition Name C.3.5 Changing a Partition LUN C.3.6 Changing the Read-Ahead Cache Size C.3.7 Enabling or Disabling Write-back Cache C.3.8 Controlling Partition Access C.3.8.1 Viewing Known WWNs Page C.3.8.2 Creating Nicknames for Host WWNs C.3.8.3 Configuring InfoShield Page C.3.8.4 Changing All Partitions to Include All Hosts C.3.9 Deleting a Partition Page Appendix D Monitoring System Status D.1 Introduction D.2 Displaying the Event Log D.2.1 Viewing the Most Recent Event D.2.2 Viewing One Event at a Time D.2.3 Viewing a Whole Screen of Events D.2.4 Capturing the Event Log D.3 Displaying Module Status Information D.4 Displaying Hardware and Configuration Information Page Page Page Page D.5 Capturing the Event Log, Hardware, and Configuration Information D.6 Displaying Drive Errors and Resetting Error Statistics D.7 Displaying Overall Statistics D.7.1 Resetting Overall Statistics Appendix E Managing Spares E.1 Managing Dedicated Spares E.1.1 Adding a Dedicated Spare E.1.2 Deleting a Dedicated Spare E.2 Enabling Dynamic Spares E.3 Managing the Spare Pool E.3.1 Adding a Spare to the Spare Pool E.3.2 Deleting a Spare from the Spare Pool E.3.3 Displaying the Spare Pool Page Appendix F Managing Disk Drives and Enclosures F.1 Managing Disk Drives F.1.1 Displaying Drive Information F.1.1.1 Displaying All Drives F.1.1.2 Viewing Drive Status Page F.1.1.3 Displaying Drive Errors and Resetting Error Statistics F.1.2 Clearing Metadata from a Drive F.1.3 Enabling and Disabling Write-back Cache Page F.1.4 Displaying Disk Cache Status Page F.1.5 Enabling and Disabling SMART Changes F.1.6 Blinking a Drive LED F.1.7 Taking Down a Drive F.1.8 Testing a Drive F.2 Managing Enclosures F.2.1 Setting the EMP LUN Page Page F.2.2 Changing the Additional EMP Setting Page Appendix G Configuring the Galaxy 65 Subsystem G.1 Shutting Down and Restarting the Storage Manager Module G.1.1 Shutting Down and Restarting the Current SM Module G.1.2 Shutting Down the Other SM Module G.1.3 Shutting Down Both SM Modules G.1.4 Other Controller Menu G.2 Changing the Date and Time Page Page G.3 Configuring the Host Channels Page G.4 Understanding LUNs and Viewing LUN Information G.4.1 Viewing LUN Information Page G.5 Configuring the FC Disk Channels Page G.6 Changing the Alarm Mute Setting Page Page G.7 Locking the Cache Setting G.8 Enabling and Disabling the Battery G.9 Changing the Utility Priority G.10 Rescanning All Channels G.11 Pausing I/O G.12 Restoring Default Settings G.13 Updating Firmware G.13.1 Updating the SM, SM Loader and Memory Controller Firmware G.13.2 Updating LAN Firmware Page Appendix H LAN Configuration H.1 Configuring the SM for TCP/IP H.2 Configuring the LAN Settings H.2.1 Configuring the IP Settings H.2.2 Configuring the FTP Settings H.2.3 Configuring the Telnet Settings H.2.4 Configuring the SNMP Settings H.2.5 Configuring the Contact Settings H.2.6 Configuring the HTTP Settings H.2.7 Configuring the Security Options H.2.8 Resetting the LAN Subsystem Page Glossary Page Page Page Page Page Page Page Index a b c d e f g h i l m n o p r s t u v w