Sun Microsystems 440 Volume Management Software

52 Netra 440 Server System Administration Guide • August 2004

Volume Management Software

Volume management software lets you create disk volumes. Sun Microsystems offers

two different volume management applications for use on the Netra 440 server:

■VERITAS Volume Manager (VVM) software

■Solaris™ Volume Manager software

Sun’s volume management applications offer the following features:

■Support for several types of RAID configurations, which provide varying degrees

of availability, capacity, and performance

■Hot-spare facilities, which provide for automatic data recovery when disks fail

■Performance analysis tools, which enable you to monitor I/O performance and

isolate bottlenecks

■A graphical user interface (GUI), which simplifies storage management

■Support for online resizing, which enables volumes and their file systems to grow

and shrink online

■Online reconfiguration facilities, which let you change to a different RAID

configuration or modify characteristics of an existing configuration

VERITAS Dynamic Multipathing

VERITAS Volume Manager software actively supports multiported disk arrays. It

automatically recognizes multiple I/O paths to a particular disk device within an

array. Called Dynamic Multipathing (DMP), this capability provides increased

reliability by providing a path failover mechanism. If one connection to a disk is lost,

VVM continues to access the data over the remaining connections. This multipathing

capability also provides greater I/O throughput by automatically balancing the I/O

load uniformly across multiple I/O paths to each disk device.

Sun StorEdge Traffic Manager

A newer alternative to DMP that is also supported by the Netra 440 server is Sun

StorEdge Traffic Manager software. Sun StorEdge Traffic Manager is a server-based

dynamic path failover software solution, used to improve the overall availability of

business applications. Sun StorEdge Traffic Manager (previously known as

multiplexed input/output, or MPxIO) is included in the Solaris OS.

Contents

Main Page Contents Page Page Page Figures Page Tables Page Preface How This Book Is Organized Using UNIX Commands Shell Prompts Typographic Conventions Related Documentation AaBbCc123 Page Configuring the System Console Communicating With the System Page What the System Console Does Using the System Console Default System Console Connection Through the Serial Management and Network Management Ports Page Alternative System Console Configuration Accessing the System Console Through a Graphics Monitor Note About the sc> Prompt Note Access Through Multiple Controller Sessions Reaching the sc> Prompt OpenBoot ok Prompt Reaching the ok Prompt Graceful Shutdown ALOM System Controller break or console Command L1-A (Stop-A) Keys or Break Key Note Externally Initiated Reset (XIR) Caution Manual System Reset Caution Getting to the ok Prompt Caution To Get to the ok Prompt Switching Between the ALOM System Controller and the System Console Note Accessing the System Controller Using the Serial Management Port To Use the Serial Management Port Activating the Network Management Port Note To Activate the Network Management Port Accessing the System Console Through a Terminal Server To Access The System Console Through a Terminal Server Page Note Accessing the System Console Through a TIP Connection To Access the System Console Through the TIP Connection Note Modifying the /etc/remote File To Modify the /etc/remote File Note Accessing the System Console Through an Alphanumeric Terminal To Access the System Console Through an Alphanumeric Terminal Note Verifying Serial Port Settings on TTYB Note To Verify the Serial Port Settings on TTYB Accessing the System Console Through a Local Graphics Monitor To Access the System Console Through a Local Graphics Monitor Page System Console OpenBoot Configuration Variable Settings Page Managing RAS Features and System Firmware Note ALOM System Controller Note Logging In To the ALOM System Controller Note To Log In To the ALOM System Controller About the scadm Utility Note To View Environmental Information Note Controlling the Locator LED Note OpenBoot Emergency Procedures OpenBoot Emergency Procedures for Systems With Non-USB Keyboards OpenBoot Emergency Procedures for Systems With USB Keyboards Stop-A Functionality Stop-N Functionality To Restore OpenBoot Configuration Defaults Stop-F Functionality Automatic System Recovery Note Auto-Boot Options Note Error Handling Summary Note Reset Scenarios Automatic System Recovery User Commands Enabling and Disabling Automatic System Recovery To Enable Automatic System Recovery Note To Disable Automatic System Recovery Note Obtaining Automatic System Recovery Information Unconfiguring and Reconfiguring Devices To Unconfigure a Device Manually Page Note To Reconfigure a Device Manually Note Enabling the Hardware Watchdog Mechanism and Its Options To Enable the Hardware Watchdog Mechanism Multipathing Software Managing Disk Volumes Disk Volumes Volume Management Software VERITAS Dynamic Multipathing Sun StorEdge Traffic Manager Note RAID Technology Disk Concatenation RAID 0: Disk Striping RAID 1: Disk Mirroring RAID 5: Disk Striping With Parity Hot-Spares Hardware Disk Mirroring Caution Physical Disk Slot Numbers, Physical Device Names, and Logical Device Names To Create a Hardware Disk Mirror Page To Delete a Hardware Disk Mirror Page To Perform a Mirrored Disk Hot-Plug Operation Caution Note To Perform a Non-Mirrored Disk Hot-Swap Operation Page Page Page Note that c1t3d0 is now listed as configured. OpenBoot Configuration Variables Page Page Page Alarm Relay Output Application Programming Interface Page Page Page Page Page Index SYMBOLS A B C D E F G H L M N O P R S T U V X