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HP ProLiant DL380p Configuring Arrays on HP Smart Array Controllers Reference - Page 106

Drive arrays and fault-tolerance methods, Drive arrays

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Drive arrays and fault-tolerance methods Drive arrays The capacity and performance of a single physical (hard) drive is adequate for home users. However, business users demand higher storage capacities, higher data transfer rates, and greater protection against data loss when drives fail. Connecting extra physical drives (Pn in the figure) to a system increases the total storage capacity but has no effect on the efficiency of read/write (R/W) operations. Data can still be transferred to only one physical drive at a time. Drive arrays and fault-tolerance methods 106

Section	Page
Configuring Arrays on HP Smart Array Controllers Reference Guide	1
Abstract	1
Notice	2
Contents	3
Overview of array configuration tools	5
Utilities available for configuring an array	5
Comparison of the utilities	5
Support for standard configuration tasks	6
Support for advanced configuration tasks	6
HP Smart Array Advanced Pack	8
About SAAP	8
Required hardware	8
Option ROM Configuration for Arrays	10
About ORCA	10
Using the ORCA menu-driven interface	10
Creating a logical drive with ORCA	11
Installing a license key with ORCA	12
Using the ORCA CLI	13
HP Online Array Configuration Utility for NetWare	15
About CPQONLIN	15
Summary of configuration procedure using CPQONLIN	15
Operating CPQONLIN in manual configuration mode	15
Menu options in CPQONLIN	16
Typical manual configuration procedures	17
Creating a new array and logical drive	18
Adding spare drives	18
Setting the rebuild priority or expand priority	19
Setting the accelerator ratio	19
Expanding an array	20
Migrating RAID level or stripe size	20
HP Array Configuration Utility	22
About ACU	22
Accessing ACU in the offline environment	22
Launching ACU with HP Intelligent Provisioning (Gen8 or later)	22
Launching ACU during POST (Gen8 or later)	23
Launching ACU from the SmartStart CD (G7 or earlier)	23
Launching ACU from an ISO image (all generations)	23
Mounting the image on a local drive	23
Mounting the image through iLO	24
Burning the image to a CD or DVD	24
Flashing the image to a USB memory key or SD card	24
Installing the image on a PXE server	25
Prerequisites	25
Set up PXELinux	25
Configure PXELinux	26
Specify the ISO image path	26
Supported network file systems	27
Accessing ACU in the online environment	27
Launching ACU on a local server	28
Launching ACU on a local server to configure a remote server	29
Launching ACU on a remote server to configure a local server	29
Using the ACU GUI	30
Navigating the GUI	31
Configuration screen	32
Diagnostics/SmartSSD screen	34
Wizards screen	37
ACU help	40
Configuration tasks	40
Configuring a controller	41
Performing a Configuration task	42
Installing a license key with ACU	44
Changing the Spare Activation Mode	44
Working with mirrored arrays	45
Splitting a mirrored array	45
Recombining a split mirrored array	45
Diagnostics tasks	46
Performing a Diagnostics task	47
Wizards	48
Using Wizards	48
Using Express Configuration	50
Using the ACU CLI	51
Opening the CLI in Console mode	52
Opening the CLI in Command mode	52
CLI syntax	52
The <target> variable	52
The <command> variable	53
Querying a device	53
Hiding warning prompts	54
Keyword abbreviations	54
The show command	54
Displaying the current versions of the application layers	56
The help command	57
Typical procedures	57
Setting the boot controller	57
Setting the boot volume	57
Setting the target	58
Identifying devices	59
Deleting target devices	59
Generating a diagnostic report	59
Erasing a physical or logical drive	60
Rescanning the system	60
Entering or deleting a license key	60
Optimizing controller performance for video	60
Creating a logical drive	61
Sample scenario	62
Moving a logical drive	63
Viewing enclosure information	64
Viewing physical drives for an HBA	64
Viewing SSD physical drives	64
Viewing SSD information	64
Assigning a chassis name to the controller	65
Managing spare drives	65
Setting the spare activation mode	66
Expanding an array	66
Shrinking an array	66
Moving an array	67
Replacing an array	68
Extending a logical drive	68
Migrating a logical drive	69
Setting the preferred path mode	69
Assigning a redundant controller to a logical drive	70
Disabling a redundant controller	70
Changing the Rebuild Priority setting	70
Changing the Expand Priority setting	70
Setting the surface scan mode	71
Changing the surface scan delay time	71
Re-enabling a failed logical drive	71
Changing the controller cache ratio	72
Enabling or disabling the drive cache	72
Enabling or disabling the array accelerator	72
Enabling a script to exit on error	72
Using ACU scripting	73
Capturing a configuration	73
Using an Input script	73
Creating an ACU script file	74
Sample custom input script	74
Script file options	75
Control category	77
Action mode	77
Method mode	77
Controller category	77
Controller	78
CacheState	78
ClearConfigurationWithDataLoss	78
DriveWriteCache	78
LicenseKey, DeleteLicenseKey	79
NoBatteryWriteCache	79
PreferredPathMode	79
RaidArrayId	79
ReadCache, WriteCache	79
RebuildPriority, ExpandPriority	80
SurfaceScanDelay	80
SurfaceScanDelayExtended	80
SurfaceScanMode	80
Video performance options	80
Array category	80
Array	81
Drive	81
DriveType	81
Join	82
OnlineSpare	82
Split	82
Logical Drive category	83
ArrayAccelerator	83
LogicalDrive	83
NumberOfParityGroups	83
PreferredPath	84
RAID	84
Renumber	84
Repeat	85
ResourceVolumeOwner	85
Sectors	85
ShrinkSize	85
Size	85
SizeBlocks	86
StripeSize	86
StripSize	86
HBA category	87
ConnectionName	87
HBA_WW_ID	87
HostMode	87
XML support	88
XML output	88
XML input	89
XML input file DTD	90
ACU scripting warning messages	91
ACU scripting error messages	91
HP Array Diagnostics and SmartSSD Wear Gauge Utility	96
About the utility	96
Reported information	96
Installing the utility	98
Setting up ADU Remote Service Mode	99
Launching the utility in CLI mode	99
Launching the utility in GUI mode	99
Diagnostic report procedures	100
Viewing the diagnostic report	100
Generating the diagnostic report	102
Identifying and viewing diagnostic report files	103
SmartSSD Wear Gauge report procedures	103
Viewing the SmartSSD Wear Gauge report	103
Generating the SmartSSD Wear Gauge report	104
Identifying and viewing SmartSSD Wear Gauge report files	105
Drive arrays and fault-tolerance methods	106
Drive arrays	106
Effects of a drive failure	108
Fault-tolerance methods	109
RAID 0—No fault tolerance	109
RAID 1 and RAID 1+0 (RAID 10)	110
RAID 1 (ADM) and RAID 10 (ADM)	111
RAID 5—distributed data guarding	113
RAID 6 (ADG)—Advanced Data Guarding	113
RAID 50	115
RAID 60	116
Comparing the hardware-based RAID methods	116
Selecting a RAID method	117
Alternative fault-tolerance methods	117
Diagnosing array problems	119
Diagnostic tools	119
Troubleshooting resources	119
Acronyms and abbreviations	121
Documentation feedback	123