APC iSCSI SATA II installation and configuration manual Advanced Operation, Rebuild

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Chapter 4 Advanced Operation

4.1 Rebuild

If one physical disk of a Raid Group, which is set to a protected RAID level (e.g.: RAID 3 , RAID 5, or RAID 6), is FAILED or has been unplugged/removed, the RG status is changed to degraded mode. The system will search/detect spare disk to rebuild the degraded RG to a complete one. It will try to detect dedicated spare disk first, then global spare disk, to rebuild.

The iSCSI RAID subsystem supports Auto-Rebuild function. The following is the scenario:

Take RAID 6 for example:

1.When there is no global spare disk or dedicated spare disk on the system, the subsystem will be in degraded mode and wait until (A) there is one disk assigned as spare disk, or (B) the failed disk is removed and replaced with new clean disk, then the Auto-Rebuild starts. The new disk will be a spare disk to the original RG automatically.

a.If the new added disk is not clean (with other RG information), it would be marked as RS (reserved) and the system will not start "auto-rebuild".

b.If this disk is not belonging to any existing RG, it would be FR (Free) disk and the system will start Auto-Rebuild function.

c.If user only removes the failed disk and plugs the same failed disk in the

same slot again, the auto-rebuild will start by this case. But rebuilding in the same failed disk may impact customer data later if the disk status is unstable. It is not recommended to rebuild on the same failed disk for better data protection.

2.When there is enough global spare disk(s) or dedicated spare disk(s) for the degraded array, the subsystem starts Auto-Rebuild immediately. And in RAID 6, if there is another disk failure happening during the time of rebuilding, the subsystem will start the above Auto-Rebuild scenario as well. Auto-Rebuild feature only works when the status of RG is "Online". It will not work at “Offline” status. Thus, it will not conflict with the “Roaming” function.

3.In degraded mode, the status of RG is “Degraded”. When rebuilding, the status of RG/VD will be “Rebuild”, the column “R%” in VD will display the ratio in percentage. After complete rebuilding, the status will become “Online”. RG will become complete.

NOTE: “Set dedicated spare” is not available if there is no RG or RAID level is 0 or JBOD, because dedicated spare disk can not be set to RAID 0 & JBOD.

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Contents ISCSI Sata II RAID Subsystem Table of Contents Advanced Operation Introduction Key Features Technical Specifications RAID row TerminologyWidth CopyISNS Internet Storage Name Service Scsi Accessed Fault- Tolerant EnclosuresScsi Enclosure Services Mechanism to control access to an iSCSI storage system overDisk Striping RAID ConceptsRAID Fundamentals Definition of RAID Levels Page Summary RAID Level Description Min. Drives RAID ManagementRAM Volume Relationship DiagramUnpacking the Subsystem Packaging, Shipment and DeliveryParts Function HDD Status IndicatorIdentifying Parts of the iSCSI RAID Subsystem Front ViewEnvironment Status LEDs LCD Display Panel LCD Control Module LCMRear View Powering On Connecting the iSCSI RAID Subsystem to Your NetworkCarrier Open Button Installing Hard DrivesHBA IP SAN ISCSI IntroductionWeb GUI Management MethodsConsole Serial Port Remote Control Secure ShellLCD Control Module LCM EnclosureRAID System Buzzer ISCSI RAID Subsystem GUI Hierarchy Mail setting Æ MailSetting Sure to logout? LoginReboot and Æ Reboot / Shutdown ShutdownLanguage Status IndicatorsQuick Install System Configuration System Setting IP Address Login Setting Mail Setting Net-SNMPhttp//net-snmp.sourceforge.net Notification SettingPage Entity Property ISCSI ConfigMTU / Jumbo frame IP settingsDefault gateway 2 NICNode Session Chap Account Volume Configuration Volume Create Wizard Page Physical Disk It’s done. View the Physical disk PD operations description Vendor Serial Type Write cache StandbyIt’s done. View the RAID group RAID GroupStatus Health RG column description Name TotalGB FreeGBShow RAID group detail information It’s done. View the Virtual disk VD column description Virtual DiskRight Priority Bg rate Status Health RAID #LUN RG name Page Logical Unit ¾ Example Select / Volume configuration / RAID groupExample Select / Volume configuration / Virtual disk Attach LUN to VD There are 2 methods to attach LUN to VD / Volume configuration / Logical unit Select / Volume configuration / Physical diskHave an error when deleting this RG Enclosure Management SES Configuration Hardware Monitor Hard Drive S.M.A.R.T. Function 4 UPS UPS Type Shutdown Battery Level Shutdown Delay sSystem Information System MaintenanceReset to Default UpgradeConfig Import & Export Event Log Logout Reboot and ShutdownRebuild Advanced OperationRAID 0+1 Way mirrorRG Migration Page VD Extension Support Microsoft Mpio and MC/S Disk RoamingSoftware/Release Number Certification ListVendor Model ISCSI Initiator SoftwareISCSI HBA card Vendor Model GbE Switch Vendor ModelHard drive Vendor Model š EMS events Level Type Description Event NotificationsPD events Level Type Description HW events Level Type Descriptionš LVM3 events Level Type Description š RMS events Level Type DescriptionVD migration VD name completes migration Finished š Jbod events Level Type Description š Battery backup events Level Type Descriptionš iSCSI events Level Type Description š System maintenance events Level Type Description Known IssuesClick Discovery Microsoft iSCSI InitiatorClick Targets Page Click Details Introduction Installation Steps for Large Volume Over 2TBPage Page Mpio and MC/S Setup Instructions System information ISCSI RAID Subsystem Enable Enable multi-path checkbox. Then click Advanced…Click Mpio tab, select Load Balance Policy to Round Robin Choose Round Robin in Load Balance Policy
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