LSI SAS2 manual Typical Integrated Mirroring Implementation

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SAS2 Integrated RAID Solution User Guide

Chapter 2: Overview of Integrated RAID Mirrored Volumes Operation of Mirrored Volumes

Integrated Mirroring Volume

Primary			Mirror

		SAS
		SAS
					Memory Bus

	LSI
	Fusion-MPT
	Fusion-MPT
	SAS2 Controller

NVSRAM

(For Write Journaling)

FLASH

(For Configuration)

3_00006-00

Figure 1: Typical Integrated Mirroring Implementation

The following figure shows the logical view and physical view of an Integrated Mirroring volume. Each logical block address (LBA) is mirrored on the second disk.

Logical View		Physical View
LBA 1	LBA 1	LBA 1'
LBA 2	LBA 2	LBA 2'
LBA 3	LBA 3	+
LBA 3	LBA 3	LBA 3'
LBA N	LBA N	LBA N’

3_00007-00

Figure 2: Integrated Mirroring Volume

You can configure an Integrated Mirroring Enhanced volume with up to 10 mirrored disks. The following figure shows the logical view and physical view of an Integrated Mirroring Enhanced volume with three mirrored disks. The firmware writes each mirrored stripe to a disk and mirrors it to an adjacent disk. RAID 1E is another term for this type of mirrored configuration.

LSI Corporation Confidential August 2010

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Image 9

Contents SAS2 Integrated RAID Solution Revision History Table of Contents Table of Contents Features Introduction to the Integrated RAID SolutionOverview Enhanced RAID 1EBenefits and Features Overview of Integrated RAID Mirrored Volumes IntroductionTypes of mirrored arrays Operation of Mirrored Volumes Typical Integrated Mirroring Implementation Integrated Mirroring Enhanced with Three Disks Mirrored Volume Features SAS2 Integrated RAID Solution User Guide Mirrored Volume Creating Mirrored VolumesConfiguration Overview Please wait, invoking SAS Configuration UtilityCreate New Array window appears Select Create RAID 1 VolumeSelect Create RAID 1E Volume Expanding an Integrated Mirroring Volume with OCE Select New Array Type window appears Manage Array window appearsArray on this adapter Following figureSmart support Manage Hot Spares window appearsHot Spare status changes to Yes Press C to create the hot spare diskOther Configuration Tasks Currently inactive Follow these steps to activate a selected volumePress Enter Select RAID Properties, and then press EnterSAS2 Bios CU, select an adapter from the Adapter List Follow these steps to select a boot diskHighlight SAS Topology, and press Enter SAS Topology window appearsBoot Device on SAS Topology Window Boot disk or as a data disk Volumes can consist of two-to-ten disksOverview of Integrated Striping Integrated Striping Example Integrated Striping DescriptionCreating Integrated Striping Volumes Creating Integrated Striping VolumesSelect Create RAID 0 Volume Viewing Volume Properties Activating an Array Select Delete Array Following figure shows Alternate deviceSAS2 Integrated RAID Solution User Guide Using the SAS2 Integrated RAID Configuration Utility Hardware and SoftwareRequirements EFI Interface Description CommandsGB of capacity on the disk drive Command to get the enclosure and slot numbers of a driveMPI2 specification and is specific for SSD drives only Following fields of IOC Page 6 specify the configuration VolumeName a user-specified string to identify the volume Appearing while the command is runningSas2ircu controller# display filename Sas2ircu controller# delete nopromptInitiator ID 112Drive Type Enclosure information Enclosure# Logical IDFailed FLD The volume has failed Configuration has changed or a drive has failedMissing MIS The volume is missing Initializing Init The volume is initializingSas2ircu controller# status Sas2ircu controller# hotspare delete EnclosureBay Physical disk I/Os Quiesced or Not quiesced  Volume status Enabled or DisabledSas2ircu list NoneSas2ircu controller# activate volumeId Sas2ircu controller# constchk volumeId nopromptSas2ircu controller# logir action filename noprompt