Spanning for RAID 10 or RAID, Parity | Dell 3 specs

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NOTE: Spanning two contiguous RAID 0 logical drives does not produce a new RAID level or add fault tolerance. It does increase the size of the logical volume and improves performance by doubling the number of spindles.

Spanning for RAID 10 or RAID 50

Table 2-1 describes how to configure RAID 10 and RAID 50 by spanning.

Ta b l e 2 - 1 . S p a n n i n g f o r R A I D 1 0 a nd R A I D 5 0

Level Description

10Configure RAID 10 by spanning two contiguous RAID 1 logical drives. The RAID 1 logical drives must have the same stripe size.

NOTE: Refer to Chapter 11 "PERC 3 BIOS Configuration Utility" for the configuration procedure for spanning RAID 1 logical drives.

50Configure RAID 50 by spanning two contiguous RAID 5 logical drives. The RAID 5 logical drives must have the same stripe size.

NOTE: Refer to Chapter 11 "PERC 3 BIOS Configuration Utility" for the configuration procedure for spanning RAID 5 logical drives.

Parity

Parity generates a set of redundancy data from two or more parent data sets. The redundancy data can be used to reconstruct one of the parent data sets. Parity data does not fully duplicate the parent data sets. In RAID, this method is applied to entire drives or stripes across all disk drives in an array. The types of parity are shown in Table 2-2.

Ta b l e 2 - 2 . Ty pe s o f Par i t y

Parity Type	Description

Dedicated	The parity of the data on two or more disk drives is stored on an
	additional disk.

Distributed	The parity data is distributed across all drives in the system.

If a single disk drive fails, it can be rebuilt from the parity and the data on the remaining drives. RAID level 5 combines distributed parity with disk striping. Parity provides redundancy for one drive failure without duplicating the contents of entire disk drives, but parity generation can slow the write process. A dedicated parity scheme during normal read/write operations is shown in Figure 2-4.

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Introduction to RAID

Image 38

Dell 3 manual Spanning for RAID 10 or RAID, Parity, Describes how to configure RAID 10 and RAID 50 by spanning

Contents

Perc 3 User’s Guide July 5C229 Safety Instructions General When Using Your Computer When Working Inside Your Computer Protecting Against Electrostatic Discharge Ergonomic Computing Habits Battery Disposal W . d e l l . c o m s u p p o r t . d e l l . c o m Contents Operating System Software Drivers Configuration on Disk ConfigurationPerc 3/SC Fault Tolerance Features Hardware Architecture Features Array Performance Features Perc 3/SC Bios Perc 3/QC Features Configuring Scsi Physical Drives 103 Planning the Array Configuration102 120 118119 131 150 135136 167 Enabling and Disabling the Cluster Mode 185163 173 196 190Designating Drives as Hot Spares 195 197 Glossary Index Figures Figures Tables Perc 3/QC Specifications 182 Bios Boot Error Messages E r v i e w C T I O N Perc 3 Features Perc 3 Overview Scsi Connectors Scsi Channels Scsi Bus Widths and Maximum Throughput Single-Ended and LVD Scsi BusesMaximum Cable Length for Scsi Standards Operating System Support Scsi Standard Scsi Bus Width Scsi Throughput Over view Introduction to RAID Perc 3 Host-Based RAID Solution RAID Definition Physical Array Components and FeaturesFault Tolerance Logical Drive Consistency Check Disk Striping G u r e 2 1 . E x a m pl e o f D i s k S t r i p i n g Stripe WidthStripe Size Disk Mirroring G u r e 2 2 . E xa m pl e o f D i s k M i r r or i n g Disk Spanning G u r e 2 3 . E x a m pl e o f D i s k S p an n i n g Parity Describes how to configure RAID 10 and RAID 50 by spanningSpanning for RAID 10 or RAID Ta b l e 2 2 . Ty pe s o f Par i t y Hot Spares G u r e 2 4 . E x a m pl e o f Par i t y Dedicated Hot Spare Disk RebuildsGlobal Hot Spare Rebuild Rate Hot SwapScsi Drive States Scsi drive states are listed in Table Logical drive states are listed in Table Logical Drive StatesEnclosure Management Ta b l e 2 3 . S C S I D r i v e S t a t e s RAID Levels Selecting a RAID Level Perc 3 also supports independent drives configured as RAIDOverview Tab l e 3 1 . R a I D Le v el s RAID 0 provides high data throughput, especially for Fault toleranceDoes not provide fault tolerance. All data lost if any Large files. Any environment that does not require Displays an example of a RAID 0 array G u r e 3 1 . R a I D 0 a r r a y Use RAID 1 for small databases or any other Environment that requires fault tolerance but smallIdeal for any application that requires fault tolerance Capacity G u r e 3 2 . R a I D 1 a r r a y RAID 5 provides high data throughput, especially for Office automation and online customer service thatRequires fault tolerance. Use for any application that Large files. Use RAID 5 for transaction processing Displays an example of a RAID 5 array G u r e 3 3 . R a I D 5 a r r a y RAID 10 works best for data storage that needs 100% Any environment that requires a higher degree of fault2n, where n is greater than 1. The maximum number Redundancy of mirrored arrays and that also needs G u r e 3 4 . R a I D 1 0 a r r a y Transfer and medium to large capacity RAID 50 works best when used with data that requiresHigh reliability, high request rates, and high data RAID 50 provides high data throughput, data Displays an example of a RAID 50 array G u r e 3 5 . R a I D 5 0 a r r a y Perc 3/SC Features Hardware Requirements Configuration FeaturesSpecification Feature Ta b l e 4 1 . C o nf i g u r a t i o n Fe at u r e s Ta b l e 4 1 . C on f i g u r a t i o n Fe at ur e s Configuration on Disk ConfigurationSmart Technology Perc 3/SC hardware architecture features are shown in Table Hardware Architecture FeaturesArray Performance Features Perc 3/SC array performance features are shown in Table Software Utilities Perc 3/SC Fault Tolerance FeaturesPerc 3/SC fault tolerance features are shown in Table Perc 3/SC software utilities are shown in Table Ta b l e 4 7 . P E R C 3 / S C Specification s Perc 3/SC SpecificationsPerc 3/SC specifications are shown in Table Operating System Software Drivers PCI Bridge/CPU Cache Memory Scsi Bus Onboard SpeakerSerial Port Scsi Termination Scsi Firmware Perc 3 Bios Configuration UtilityFeature Description RAID Management Dell OpenManage Array Manager WebBIOS Configuration UtilityDell Manager Perc 3/DC and Perc 3/DCL Features Ta b l e 5 1 . C o nf i g u r a t i o n Fe at u r e s MB Dimm Perc 3/DC Configuration on Disk Fe a t u r es Ta b l e 5 4 . a r r a y Pe r f o r m a nc e Fe at u r e s Fault Tolerance FeaturesLists the fault tolerance features Ta b l e 5 5 . Fa u l t To l e r a n ce Fe at u r e s Lists the software utilities Perc 3/DC and Perc 3/DCL SpecificationsLists the Perc 3/DC and Perc 3/DCL specifications Ta b l e 5 6 . S o f t w a r e U t i l i t i e s PCI Bridge/CPU Perc 3/DC and Perc 3/DCL Bios Ta b l e 5 8 . S C S I F i r mw ar e RAID Management Perc 3/QC Features Lists the Perc 3/QC configuration features Ta b l e 6 1 . C o n f i g u r at i on Fe a t u r e s Smart Technology S k Fe a t u r es Lists the Perc 3/QC hardware architecture featuresLists the array performance features Ta b l e 6 4 . a r r a y Pe r f o r m a n ce Fe at u r e s Ta b l e 6 4 . a r r a y Pe r f o r m a nc e Fe at u r e s Fault tolerance features are listed in TableSoftware utilities are listed in Table Ta b l e 6 5 . Fa u l t To l e r a n ce Fe at u r e s Ta b l e 6 6 . S o f t w a r e U t i l i t i e s Perc 3/QC SpecificationsPerc 3/QC specifications are listed in Table Ta b l e 6 7 . P E R C 3 / Q C S pe c i f i c a t i o n s Ta b l e 6 7 . P E R C 3 / Q C Pe c i f i c a t i o n s Perc 3/QC Bios Ta b l e 6 8 . S C S I F i r mw ar e Dell Manager Configuring Perc Device Description Configuring Scsi Physical DrivesCurrent Configuration Scsi Channel Scsi ID Scsi ID Logical Drive Configuration Logical LD2 LD3 LD4 LD5 LD6 LD7 LD8 LD9 Channel Physical Device LayoutTa b l e 7 6 . P h y s i c al D ev i c e L a y o ut W . d e l l . c o m s u p p o r t . d e l l . c o m Ta b l e 7 6 . P h y s i c al D ev i c e L a y o ut Configuring Arrays Creating Hot Spares Configuration StrategiesArranging Arrays Creating Logical Drives Maximizing Drive Availability Fault Tolerance ProtectionMaximizing Capacity Description Drives Capacity Level Required Assigning RAID Levels Maximizing Drive Performance Optimizing Data Storage Configuring Logical DrivesData Access Requirements Question Answer Planning the Array ConfigurationArray Functions Using the Array Configuration Planner Ta b l e 7 1 Random Array DeletionOverview Configuration Module 100 Perc 3/SC Hardware Installation Requirements Optional Equipment G u r e 8 1 . P E R C 3 / S C C a r d L a yo u t Installation StepsPerc 3/SC Card Layout Unpack Power DownLicense agreement Perc 3 configuration utilities diskette 104 Tab l e 8 1 . P E R C 3 / S C J u mp e r s J1 Termination EnableSet Jumpers Ta b l e 8 3 . J9 J9 I2C Interface ConnectorJ5 Serial Port N o u t J15 Rubi Slot Interrupt Steering J10 Term PowerJ8 Hard Disk LED Ta b l e 8 5 . J 8 H a r d D i s k L E D G u r e 8 2 . E xa m pl e o f S C S I Te r m i n at i on Set Scsi TerminationJ16, J17 Rubi Slot Interrupt Steering 108 Terminating Internal Scsi Disk Arrays Scsi TerminationSelecting a Terminator 109 ID2 111 Install Perc 3/SCG u r e 8 4 . P C I S l o t s o n M o t h e r b o ar d 112 G u r e 8 6 . C o n n e ct i n g S C S I C a b l e s Connect Scsi CablesConnect Scsi Devices 113 114 Set Target IDsCable Suggestions Priority Highest Lowest Power On Host SystemTa b l e 8 Tar g et 115 116 Run Perc 3 Bios Configuration Utility or WebBIOS UtilityInstall Operating System Software Drivers Perc 3/DC or Perc 3/DCL Hardware Installation Perc 3/DC or Perc 3/DCL Hardware Installation Perc 3/DC Card Layout G u r e 9 1 . P E R C 3 / D C C a r d L a y ou t Perc 3/DCL Card Layout G u r e 9 2 . P E R C 3 / D C L C ar d L ay o u t 121 Unpack the Perc 3/DC or Perc 3/DCLTa b l e 9 1 . J u mp e r S e t t i n g s J9 Setting Onboard Bios Status J2, and J3 Termination EnableJ9 Onboard Bios Enable Jumper J13 Dirty Cache LED J10 Nvram ClearJ11 Serial Port Tab l e 9 6 . J 1 3 D i r t y C ac h e L E D P i n ou t J16 and J18 Termpwr EnableJ14 Scsi Activity LED Ta b l e 9 7 . J1 4 S C S I a c t i v i t y P i n o u t Ta b l e 9 9 . J 1 7 I 2 C C o n n e ct or P i n o u t J17 I2C ConnectorJ17 is a 4-pin header. -9 displays the J17 pinout 125 Install the Perc 3/DC or Perc 3/DCL Controller 126 127 Select and Set Target IDs for Scsi Devices 128 129 130 Using Driver 5.30 and Firmware Install Operating System Software DriverUsing Driver 5.22.1 or 5.22.2 and Firmware 161J or 161N Proceed to the Windows Device Manager 132 Perc 3/QC Hardware Installation C T I O N 1 134 Perc 3/QC Card Layout G u r e 1 0 1 . P E R C 3 / Q C C a r d L a yo u t License agreement Perc 3/QC Configuration Utilities diskette Unpack the Perc 3/QC Controller Ta b l e 1 0 1 . P E R C 3 / Q C J u m p er S et t i n g s 137 Jumper Term Settings Power Channel J2, J3, J5, and J7 Termination EnableJ9, J10, J11, and J12 Termpwr Enable 138 J17 Dirty Cache LED J19 Onboard Bios EnableJ14 Serial Port Tab l e J23 External BatteryJ19 Setting Onboard Bios Status 140 G u r e 1 0 3 . E x a mp l e o f Te r m i n at i o n 141 142 143 Install Perc 3/QCG u r e 1 0 5 . P C I S l o t s o n M o t h e r b o ar d 144 G u r e 1 0 7 . C o n n e ct i n g S C S I C a b l e s 145 146 Install Operating System Driver 147 Perc 3/QC Hardware Installation Perc 3 Bios Configuration Utility Select Configure Menu-View/Add Configuration Configuration On DiskStarting the Perc 3 Bios Configuration Utility Bios Configuration Utility Menu Options Option Description Configure Menu 152 Adapter Initialize MenuObjects Menu Ta b l e 1 1 3 . a d ap t er M en u O p t i on s 154 Virtual Sizing Cluster Mode and the Initiator IDLogical Drive Ta b l e 1 1 Log i c a l D r i v e M en u O p t i o ns 156 Select Enabled to enable Virtual SizingPhysical Drive Ta b l e 1 1 6 . S C S I C h an n e l M e nu O pt i o n s Battery InformationChannel Menu Item Explanation Format Menu Reset Battery Charge CounterSelect Reset Battery Charge Counter Rebuild Menu Configuring Arrays and Logical Drives Check Consistency Menu New Configuration Choosing the Configuration MethodEasy Configuration Perc 3/SC and Perc 3/DCL Default Settings View/Add ConfigurationPerc 3/QC and Perc 3/DC Default Settings Displays the default settings for Perc 3/QC and Perc 3/DC Designating Drives as Hot Spares Reserved Disk Space during ConfigurationUsing the Objects-Physical Drive menu Press F4 Using Easy Configuration 164 Set the Stripe Size from the Advanced Menu 165 166 Set the Write Policy from the Advanced MenuSet the Read Policy from the Advanced Menu Using New Configuration Choose Configure-New Configuration from the Management Menu 168 169 170 Set the Read Policy Set the Stripe SizeSet the Write Policy 171 Set the Cache Policy 172 Using View/Add Configuration 174 175 176 177 Initializing Logical Drives Batch Initialization Deleting Logical Drives Random Array Deletion Individual Initialization Formatting Drives Media ErrorsFormatting Physical Drives Select Objects-Physical Drives from the Management Menu Select Format from the Management Menu Physical Drive action menu for a physical driveBatch Formatting Individual Formatting Manual Rebuild Rebuilding an Individual Drive Manual Rebuild Batch ModeRebuilding Failed Disk Drives Choose Rebuild from the Management Menu Using a Pre-loaded Scsi Drive As-is Select Configure-Easy Configuration Exiting the Perc 3 Bios Configuration Utility Setting Hardware Termination Clustering Cluster ModeEnabling and Disabling the Cluster Mode Select Objects-Adapter-Cluster Mode Select Enable or Disable 186 Dell Manager Type this Starting Dell ManagerFirst Dell Manager screen displays the Management Menu Displays the options for the Dell Manager Management Menu Using Dell Manager in Red Hat Linux GUI ModeManagement Menu Options Ta b l e 1 2 2 . M a na g e me n t M e n u O p t i o n s Dell Manager Menu Options Ta b l e 1 2 3 . a d ap t er M en u O p t i on s Ta b l e 1 2 3 . a d ap t er Me n u O p t i on s Logical Drive SettingsParameter Setting 191 Tab l e 1 2 Physical Drive MenuDisplays the options in the physical drive menu 192 Ta b l e 1 2 7 . S C S I C h an n e l O p t i on s Battery BackupScsi Channel Ta b l e 1 2 8 . B a t t er y B a ck u p M e n u I t e m s 194 Reconstruct Menu Parameters Initializing Logical Drives Perform the following steps to initialize one logical drive Select Objects-Logical Drive Choose Objects-Logical Drive. The logical drives display Select Physical Drive-Objects Choose Format on the Management Menu Select Objects-Physical Drive on the Management Menu Perform the following steps to rebuild one drive Ta b l e 1 2 Re b u i l d Typ e s Exiting Dell Manager Perform the following steps to rebuild more than one drive Tr o u b l e s h o o t i n g Problem Suggested Solution Message Problem Suggested Solution Bios Boot Error MessagesTa b l e 1 3 2 . B I O S B o ot Error M e s s a ge s View/Add Configuration 206 207 Ta b l e 1 3 3 . O t h er B I O S Error Me s s a g e s Other Bios Error MessagesExplains the other Bios error messages that can display Ta b l e 1 3 4 . O t h e r Po t e n t i a l P r o b l e ms Other Potential ProblemsDescribes other items that might cause problems Topic Information Tone Pattern Meaning Examples Audible WarningsTa b l e 1 3 5 . a u di bl e Wa r n i n g s Appendix a Scsi Cables and Connectors Appendix a Scsi Cables and Connectors Appendix B Warranties and Return Policy One-Year Limited Warranty U.S. Only 214 215 Two-Year Limited Warranty U.S. Only 216 Limited Warranty Coverage During Year One 217 Limited Warranty Coverage During Year Two 218 General Provisions 219 Three-Year Limited Warranty U.S. Only 220 Limited Warranty Coverage During Years Two and Three 221 222 Four-Year Limited Warranty U.S. Only 223 Limited Warranty Coverage During Years Two, Three, and Four 224 225 One-Year Limited Warranty Canada Only 226 227 Two-Year Limited Warranty Canada Only 228 229 230 Three-Year Limited Warranty Canada Only 231 232 233 Total Satisfaction Return Policy U.S. Only 234 Making a Claim GuaranteeExclusions 235 Dell Computer de Colombia Corporation Limitation and Statutory RightsDell World Trade LP Carrera 7 #115-33 Oficina Bogota, Colombia Glossary 237 238 239 240 241 242 243 244 245 Gl ossar y D ex 247 248 249 250 Page 5C229 Rev. 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