Sun Microsystems 440 manual Managing Disk Volumes

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C H A P T E R 3

Managing Disk Volumes

This chapter describes redundant array of independent disks (RAID) concepts, how to manage disk volumes, and how to configure hardware mirroring using the on-board Ultra-4 SCSI controller.

This chapter contains the following sections:

■“Disk Volumes” on page 51

■“Volume Management Software” on page 52

■“RAID Technology” on page 54

■“Hardware Disk Mirroring” on page 56

■“Physical Disk Slot Numbers, Physical Device Names, and Logical Device Names” on page 57

■“To Create a Hardware Disk Mirror” on page 57

■“To Delete a Hardware Disk Mirror” on page 59

■“To Perform a Mirrored Disk Hot-Plug Operation” on page 61

■“To Perform a Non-Mirrored Disk Hot-Swap Operation” on page 62

Disk Volumes

Disk volumes are logical disk devices comprising one or more physical disks or partitions from several different disks.

Once you create a volume, the operating system uses and maintains the volume as if it were a single disk. By providing this logical volume management layer, the software overcomes the restrictions imposed by physical disk devices.

Sun’s volume management products also provide RAID data redundancy and performance features. RAID is a technology that helps protect against disk and hardware failures. Through RAID technology, volume management software is able to provide high data availability, excellent I/O performance, and simplified administration.

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Contents Netra 440 Server System Administration Guide Page Contents Managing RAS Features and System Firmware Managing Disk Volumes Iv Netra 440 Server System Administration Guide August Figures Vi Netra 440 Server System Administration Guide August Tables Viii Netra 440 Server System Administration Guide August How This Book Is Organized PrefaceShell Prompts Using Unix CommandsRelated Documentation Typographic ConventionsThird-Party Web Sites Accessing Sun DocumentationContacting Sun Technical Support Sun Welcomes Your CommentsCommunicating With the System Configuring the System Console1Ways of Communicating With the System What the System Console Does Using the System ConsoleSerial MGT NET MGT Alom serial management port Alom network management port 3Alternative Console Ports Require Additional Configuration Alternative System Console ConfigurationAccessing the System Console Through a Graphics Monitor About the sc Prompt Reaching the sc Prompt OpenBoot ok PromptAccess Through Multiple Controller Sessions Reaching the ok Prompt L1-A Stop-A Keys or Break Key Alom System Controller break or console CommandGraceful Shutdown Manual System Reset Externally Initiated Reset XIRGetting to the ok Prompt For More InformationTo Get to the ok Prompt 2Ways of Accessing the ok PromptConsole # Using the Serial Management Port Accessing the System ControllerEstablish an Alom system controller session Activating the Network Management PortTo Use the Serial Management Port Log out of the Alom system controller session To verify the network settings, typeTo Activate the Network Management Port To Access The System Console Through a Terminal Server Accessing the System Console Through a Terminal Server3Pin Crossovers for Connecting to a Typical Terminal Server Open a terminal session on the connecting device, and type Power on the system Accessing the System Console Through a TIP ConnectionA shell tool window on the Sun system, type To Access the System Console Through the TIP ConnectionOk power-off To Modify the /etc/remote File If the number displayed by the uname -rcommand is less thanModifying the /etc/remote File Netra 440 Server System Administration Guide August Ok setenv input-device ttyb ok setenv output-device ttyb To Verify the Serial Port Settings on Ttyb Verifying Serial Port Settings on TtybOpen a shell tool window Type Look for the following outputFor more information, see Getting to the ok Prompt on To cause the changes to take effect, type Output-device Ttya Ttyb Screen Input-device Keyboard System Console OpenBoot Configuration Variable SettingsNetra 440 Server System Administration Guide August Managing RAS Features and System Firmware Logging In To the Alom System Controller Alom System ControllerTo Log In To the Alom System Controller About the scadm UtilitySc showenvironment To View Environmental InformationTo turn on the Locator LED, do one of the following Controlling the Locator LEDTo turn off the Locator LED, do one of the following OpenBoot Emergency Procedures Stop-N Functionality To Restore OpenBoot Configuration DefaultsStop-A Functionality To reset the system, type the following command Automatic System RecoveryStop-F Functionality Stop-D FunctionalityAuto-Boot Options Error Handling Summary Automatic System Recovery User Commands Reset ScenariosEnabling and Disabling Automatic System Recovery To Enable Automatic System RecoveryTo cause the parameter change to take effect, type To Disable Automatic System RecoveryTo cause the parameter changes to take effect, type To Unconfigure a Device Manually Unconfiguring and Reconfiguring DevicesObtaining Automatic System Recovery Information To determine full physical device paths, type To Reconfigure a Device Manually Enabling the Hardware Watchdog Mechanism and Its Options To Enable the Hardware Watchdog MechanismMultipathing Software Disk Volumes Managing Disk VolumesSun StorEdge Traffic Manager Volume Management SoftwareVeritas Dynamic Multipathing Managing Disk Volumes Disk Concatenation RAID TechnologyRAID 1 Disk Mirroring RAID 0 Disk StripingHot-Spares Hardware Disk MirroringRAID 5 Disk Striping With Parity C1t3d0 Devices/pci@1f,700000/scsi@2/sd@3,0 To Create a Hardware Disk MirrorFor example To Delete a Hardware Disk Mirror To delete the volume, type the following command To Perform a Mirrored Disk Hot-Plug Operation To confirm a failed disk, type the following commandTo Perform a Non-Mirrored Disk Hot-SwapOperation CD-ROM View the status of the Scsi devices# cfgadm -x removedevice c0dsk/c1t1d0 Remove the hard drive from the device treeVerify that the device has been removed from the device tree Configure the new hard driveVerify that the new hard drive is in the device tree OpenBoot Configuration Variables Baudrate, bits Appendix a OpenBoot Configuration Variables Netra 440 Server System Administration Guide August Alarm Relay Output Application Programming Interface Netra 440 Server System Administration Guide August Page Netra 440 Server System Administration Guide August Page Netra 440 Server System Administration Guide August Index SymbolsNetra 440 Server System Administration Guide August Asr-disable, 46 go Console, 11, 41 console -f, 9 poweroff, 12 poweron Uadmin 11 uname, 25 uname -r Netra 440 Server System Administration Guide August