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Promise Technology M500p, M500i, M500f, M300p, M300i Choosing a RAID Level, Advantages Disadvantages

Models: M500i M200f M300f M200p M500p M300p M200i M500f M300i

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Chapter 7: Technology Background

Choosing a RAID Level

There are several issues to consider when choosing the RAID Level for your VTrak disk array. The following discussion summarizes some advantages, disadvantages, and applications for each choice.

RAID 0

	Advantages	Disadvantages

	Implements a striped disk array, the	Not a true RAID because it is not fault-
	data is broken down into blocks and	tolerant
	each block is written to a separate disk	The failure of just one drive will result in
	drive	all data in an disk array being lost
	I/O performance is greatly improved by	all data in an disk array being lost
	I/O performance is greatly improved by	Should not be used in mission critical
	spreading the I/O load across many	environments
	channels and drives	environments
	channels and drives
	No parity calculation overhead is
	involved

Recommended Applications for RAID 0

•Image Editing

•Pre-Press Applications

•Any application requiring high bandwidth

RAID 1

Advantages	Disadvantages

Simplest RAID storage subsystem	Very high disk overhead - uses only
design	50% of total capacity
Can increase read performance by
processing data requests in parallel
since the same data resides on two
different drives

Recommended Applications for RAID 1

•Accounting

•Payroll

•Financial

•Any application requiring very high availability

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Promise Technology M500p, M500i, M500f, M300p, M300i, M300f, M200i, M200p, M200f Choosing a RAID Level, Advantages Disadvantages

Contents

Vtrak Recommendations CopyrightTrademarks Important data protection information Contents Setup Management with WebPAM PRO Management with the CLU Technology Background Index TroubleshootingSupport Appendix a Useful Information About This Manual Introduction VTrak M500f/i/p front view Overview VTrak M500f Rear View M500i/p have different controllers Architectural Description Feature Benefit Features and Benefits Allows you to manage the RAID subsystem M500f/i/p Specifications Novell Netware M300f/i/p, M200f/i/p FCC Statement VTrak M-Class Product Manual Unpack the VTrak Installation Rackmounted VTrak M500f/i/p Mount VTrak M500f/i/p in a Rack Installation Rackmounted VTrak M300f/i/p M200f/i/p is similar Mount VTrak M300f/i/p or M200f/i/p in a Rack Installation Drives Install Disk Drives M500f/i/p drive carrier mounting holes Sata Disk Drives mount at the front of the carrier Drive Numbering VTrak disk drives are numbered left to right Fibre Channel Storage Area Network Set Up Network Cable Connections VTrak M500f DAS connections M300f and M200f are similar Fibre Channel Direct Attached Storage VTrak M300i and M200i SAN connections M500i is similar ISCSI Storage Area Network VTrak M300i and M200i DAS connections M500i is similar ISCSI Direct Attached Storage Scsi HBA Scsi Direct Attached Storage Serial connectors for VTrak M500f left and M300i right Set Up Serial Cable Connections SCSI-1 SCSI-2 Connect the Power VTrak M500f/i/p drive carrier LEDs VTrak M-Class Product Manual VTrak Setup with CLI or CLU Setup Administrator@cli net -a mod -t mgmt -s dhcp=enable CLI Fibre Channel and Scsi Models M500f/p, M300f/p, M200f/pCLI iSCSI Models M500i, M300i, M200i ISCSI 0.0 Administrator@cli net -a mod -t iSCSI -p 1 -s dhcp=enable System Date and Time CLU Fibre Channel and Scsi Models M500f/p, M300f/p, M200f/p Management Port Exit the CLU CLU iSCSI Models M500i, M300i, M200i System Date and Time VTrak M-Class Product Manual ISCSI Ports Exit the CLU Software-based iSCSI Initiator Install iSCSI Initiator on the Host PC VTrak M-Class Product Manual Secure Connection VTrak Setup with WebPAM PROeLog-in to WebPAM PROe Regular Connection VTrak M-Class Product Manual Setup Language Selection Automatic Create a Disk Array Express Setup Advanced Setup VTrak M-Class Product Manual Setup VTrak M-Class Product Manual Setup Log-out of WebPAM PROe Additional Logical Drives Internet Connection using WebPAM PROe VTrak M-Class Product Manual Management with WebPAM PROe VTrak Status Indicators VTrak M300f/i/p and M200f/i/p front panel LED display State LEDs Dark Steady Flashing Amber Red Green Drive Status Indicators Audible Alarm LEDs StateSteady Flashing Amber Red Green Log-in/Log-out Http//192.168.10.148Https//192.168.10.148 VTrak M-Class Product Manual WebPAM PROe Opening Screen Graphic User Interface View HeaderFunction Language Selection Contact Us Storage Network Tree View Subsystems Management WindowEvent Frame Subsystem Settings SubsystemSubsystem Information Save Events Subsystem EventsView Events Clear Events Change Background Settings Background ActivitiesStart Background Function Scheduler View Scheduled ActivitiesSchedule an Activity Delete an Activity Renew Lock LockView Lock Status Set Lock Administrative Tools User ManagementRelease Lock User Settings Administrator User Settings UserUser Information User Event Subscription Smart List of User Notification Events User Password Administrator User Password UsersCreate a User List of User Privileges Delete a User User Sessions Network Management ISCSI Data Ports Fibre Channel Node Fibre Channel Management Fibre Channel Port Fibre Channel Port Settings Fibre Channel Statistics Fibre Channel SFP Fibre Channel Initiators Fibre Channel Logged-in Devices ISCSI Node ISCSI Management ISCSI Ports ISCSI Port Statistics ISCSI Sessions Click the iSNS Port 1 or iSNS Port 2 link ISCSI iSNS ISCSI SLP ISCSI ChapView CHAPs Add a Chap Edit a ChapDelete a Chap Scsi Channel Information Scsi Channel SettingsScsi Management ISCSI Ping Scsi Target Information Delete an Initiator Storage ServicesInitiators Add an Initiator Edit a LUN Map Enable LUN MaskingLUN Map Fibre Channel and iSCSI View LUN Map LUN Mapping Parameters LUN Map Scsi Software Management Change Email Setting Send a Test MessageManual Start, Restart, Stop Web Server Click on the Web Server Setting link Telnet Change Start Setting Snmp 105 CIM CIM Service Settings Netsend Delete Recipients Add Recipients Import Export Restore Factory Defaults Firmware Update Clear Statistics Shutdown and RestartShutdown Monitor the Shutdown Restart the SubsystemMonitor the Restart Controllers Controller Information Controller 115 Controller Settings Controller StatisticsClear Statistics Enclosures VTrak M500f is show above, The M500i/p are similar Identify Enclosure Enclosure Settings EnclosureEnclosure Information FRU VPD Battery Battery Recondition BuzzerSilence Buzzer Change Buzzer Settings Physical DrivesIdentify a Physical Drive Physical Drives Settings Physical Drive Physical Drive InformationAdvanced Physical Drive Information Identify a Physical Drive Physical Drive Statistics Clear Physical Drive Conditions Physical Drive Settings Force a Physical Drive Offline/Online Physical Drive Media Patrol Disk Arrays Create a Disk Array Express Create a Disk Array Automatic 130 Create a Disk Array Advanced Disk Array CreationLogical Drive Creation Summary Delete a Disk Array Disk Array Information Disk Array Physical Drives in the Disk Array Logical Drives in the Disk ArrayDisk Array Status Create a Logical Drive Disk Array Settings 136 Disk Array Migration Delete a Logical Drive Disk Array Rebuild Manual Rebuild Disk Array Background Activity View Progress of Background Function Transition Transport Logical Drives Logical Drive Status Logical Drive Information Logical Drive Logical Drive Statistics in alphabetical order Logical Drive Settings Logical Drive Initialization Logical Drive Background Activity Logical Drive Synchronization Logical Drive Redundancy Check Logical Drive Check Table Logical Drive PDM Logical Drive LUN Settings iSCSI and Fibre Channel Logical Drive LUN Settings Scsi Spare Drives Create Spare Drive Spare Check All Spare Drives Delete Spare Drive Spare Drive Spare Drive InformationLocate a Spare Drive Spare Drive Settings Spare Check Individual Spare Drive Logical Drive Summary VTrak M-Class Product Manual 156 Management with the CLU 158 Management with the CLU 160 Telnet 192.168.1.56 CLU ConnectionSerial Connection Telnet Connection 162 Exit the CLU CLU Function Map 165 166 167 168 169 170 171 172 Media Patrol Quick SetupSubsystem Management Alias Controller Settings System Date and TimeController Management Physical Drive Coercion Alias Enclosure Management Power Supply UnitsEnclosure Management Enclosure Status Polling Interval Enclosure SettingsTemperature Sensors Voltage Sensors Batteries Temperature Thresholds Global Physical Drive Settings Physical Drive ManagementLocate Enclosure Physical Drive Statistics Individual Physical Drive SettingsCommand Queuing Advanced Information Locate Physical Drive Force Physical Drive Offline/Online Disk Array Management Highlight Save Settings and Continue and press Enter Delete a Disk Array Rebuild Disk Array Settings and FunctionsDisk Array Information Media Patrol Predictive Data Migration Migration Locate Disk Array Create a Logical DriveAccept Incomplete Array Delete a Logical Drive Logical Drive Management Read Cache Policy Logical Drive Settings and FunctionsLogical Drive Information Write Cache Policy Redundancy Check Locate Logical Drive Manual Management Port SettingsISCSI Port Settings Network Management Logged-in Devices Fibre Channel ManagementNode Ports Port SFP Port Settings Port Statistics Fibre Channel Initiators ISCSI Management ISNS Sessions Ping Add a ChapDelete a Chap Channel Settings Scsi ManagementChannel Information Target Information Background Activity Background Activities List Background Activity Settings Event Viewer Runtime EventsNvram Events Additional Info and Management Spare Drive ManagementCreate New Spare Drive Delete Spare Drive LUN Mapping Fibre Channel and iSCSI Map a LUN to an Initiator LUN Mapping ScsiCreate New Initiator Delete Initiator Create New User Password User Settings Display Name and Email AddressUser Settings Privilege and Status Delete User Webserver 209 Snmp Trap Sinks Highlight Create New Message Recipient and press Enter Netsend Recipients Flash through Tftp Shutdown over Telnet Shutdown over SerialRestart over Telnet Restart over Serial Buzzer Maintenance Mgmt Firmware Update WebPAM PROe Tftp ServerYour PC Restart VTrak Firmware Update CLU Replace Power Supply All Models Replace Cooling Unit Fan M500f/i/p Disconnect 223 224 225 Replace Cooling Unit Fan M300f/i/p and M200f/i/p Thumbscrew 228 229 Replace Cache Battery M500f/i/p Detach 232 Replace Cache Battery M300f/i/p and M200f/i/p 234 Replace SEP M500f/i/p Replace SEP M300f/i/p and M200f/i/p Replace RAID Controller All Models VTrak M-Class Product Manual 238 Introduction to RAID Technology Background RAID 0 Striping interleaves data across multiple drives RAID 0 Stripe Data Mirror Disk Drives RAID 1 Mirror RAID 1E Enhanced Mirror RAID 5 Stripes all drives with data and parity information RAID 5 Block and Parity Stripe RAID 10 Mirror + Stripe RAID 50 Axles RAID 50 Striping of Distributed Parity No. of Drives No. of Axles RAID ArrayPer Axle Advantages Disadvantages Choosing a RAID Level RAID 1E 249 Sector Size Stripe Size Read Cache Policy Cache Policy Capacity Coercion Write Cache PolicyCache Line Size Hot Spare Drives Initialization Add Lose Partition and Format the Logical DriveRAID Level Migration From Increase Redundancy Capacity RAID RAID 1/1E Ranges of Disk Array Expansion Current LD Size Maximum LD Sector Size Expansion SizeCreate a New Logical Drive Media Patrol Predictive Data Migration PDMPDM Triggers Transition Example Manual Transition Automatic Transition VTrak is Beeping Troubleshooting Front Panel LEDs Display Amber or Red FC/iSCSI Activity Scsi 1 or Drive Status Indicators Back of Enclosure Battery and fan LEDs VTrak M500f/i/p Dark Green Amber Red Battery and fan LEDs VTrak M300f/i/p and M200f/i/p Green Amber Flashing VTrak iSCSI controller DA2 CLU Reports a Problem WebPAM PROe Reports a Problem 270 Battery Event Notification ResponseEvent Action Blowers Drive Interface Controller CacheController Disk Array Enclosure Event LogHost Interface Controller Host-interface controller is Fibre Channel ISCSILogical Drive Media Patrol Physical Disk PDM Physical disk negotiation PSU Fans RAID Level Migration Redundancy Check Rebuild Spare Drives ResourceSEP Storage Enclosure Processor Spare Check Synchronization Stripe Level Migration System VTrak TransitionWatermark When a Disk Drive Fails Critical & Offline Disk ArraysWith a Hot Spare Drive Rebuild Operation Without a Hot Spare Drive Status Activity Enclosure Problems Overheating Power Supplies Connection Problems Scsi ConnectionsTermination Serial Connections ISCSI Connections Amber Green Flashing Green Network Connections Unsaved Data in the Controller Cache VTrak M-Class Product Manual 296 What kind of disk drives can I use with VTrak? Frequently Asked QuestionsHow can I tell when the VTrak has fully booted? Why does VTrak come with a Command Line Utility? Are logical drives on VTrak limited to 2.199 terabytes? How can I be sure everything is working OK on the VTrak? Technical Support ServicesCan VTrak run using just one power supply? Contact Technical Support Italy United StatesEurope, Africa, Middle East Germany China Taiwan Disclaimer of other warranties Limited Warranty Your Responsibilities Returning Product For Repair Or retailer Pin Signal Serial Connector Pinout Snmp MIB Files Load MIB FilesCompliance Statement Index CLU 32 Dead 135 Activity LED 26, 58, 158 Activity LED 26, 58, 158, 263 Chap 93 CLU 33 RAID 0 240 RAID 1 241, 247 Stale 135 193 Transition 140, 187