DataKeeper for Windows All Documentation - SIOS

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Mirror RESYNCINGMirror RESYNCINGWhen the interruption of either an Asynchronous or Synchronous mirror is resolved, it is necessary toresynchronize the source and target volumes and the mirror enters into a RESYNC state.DataKeeper reads sequentially through the persistent bitmap file to determine what blocks have changed onthe source volume while the mirror was PAUSED and then resynchronizes only those blocks to the targetvolume. This procedure is known as a partial resync of the data.The user may notice a Resync Pending state in the GUI, which is a transitory state and will change to theResync state.During resynchronization, all writes are treated as Asynchronous, even if the mirror is a Synchronous mirror.The appropriate bits in the bitmap are marked dirty and are later sent to the target during the process of partialresync as described above.DataKeeper for Windows Technical DocumentationPage 16
Read and Write OperationsRead and Write OperationsAfter the volume mirror is created and the two drives on the primary and secondary servers are synchronized,the following events occur:• The system locks out all user access to the target volume; reads and writes are not allowed to thetarget volume. The source volume is accessible for both reads and writes.• Both mirrored and non-mirrored volume read operations arriving at the driver on the primary server arepassed on and allowed to complete normally without intervention. Reads of a mirrored volume on thesecondary system are not allowed, i.e., the secondary has not assumed the role of a failed primary.• Whenever the primary server receives a write request, the system first determines whether the requestis for a mirrored volume. If not, the write is allowed to complete normally without any furtherintervention. If the write request is for a mirrored volume, the request is handled depending on themirroring type:• If the type is synchronous, then the write request is sent to both the source and target volumesat the same time. Should an error occur during network transmission or while the target systemexecutes its write, the write process on the target is terminated. The source will then completeDataKeeper for Windows Technical DocumentationPage 17
Page 1 and 2: DataKeeper for Windowsv7.6Technical
Page 4 and 5: Specifying Network Cards for Mirror
Page 6 and 7: TargetPortIncr * 48TargetDispatchPo
Page 10 and 11: Continue and Lock 111Partial Resync
Page 12 and 13: Planned Switchover 150Unplanned Swi
Page 14 and 15: Index 176Table of Contentsxii
Page 16 and 17: User InterfaceUser InterfaceSteelEy
Page 18 and 19: DataKeeper Service Log On ID and Pa
Page 22 and 23: Understanding ReplicationEnvironmen
Page 24 and 25: SteelEye DataKeeper Resynchronizati
Page 26 and 27: Synchronous Mirroringvolume write,
Page 28 and 29: Asynchronous MirroringIn the diagra
Page 32 and 33: Volume Considerationsthe write requ
Page 34 and 35: Mirror State CountersMirror State C
Page 36 and 37: Queue High WaterQueue High WaterDef
Page 38 and 39: Resync PhaseRange: 0 - MAX_ULONGThi
Page 40 and 41: Chapter 3: ConfigurationRequirement
Page 46 and 47: Firewall ConfigurationsEnvironmentM
Page 48 and 49: Configuring Microsoft's Windows Fir
Page 50 and 51: High-Speed Storage Best PracticesHi
Page 52 and 53: Handling Unmanaged Shutdown IssuesH
Page 54 and 55: Verifying Data on the Target Volume
Page 56 and 57: Chapter 4: AdministrationThe topics
Page 58 and 59: Extensive Write ConsiderationsExten
Page 60 and 61: BandwidthThrottle †\{Target IP}Th
Page 62 and 63: TargetPortBase *Specifies the maxim
Page 64 and 65: WriteQueueHighWater * †WriteQueue
Page 66 and 67: Registry Entries that SHOULD NOT be
Page 68 and 69: ErrorControl\CurrentControlSet\Serv
Page 70 and 71: BuildTimeBuildTimeLocation: HKEY_LO
Page 72 and 73: VolumeAttributesSnapshotDeviceREG_S
Page 74 and 75: SourceDriveLetterSpecifies the driv
Page 76 and 77: BreakUserRequestedBreakUserRequeste
Page 78 and 79: CHANGEMIRRORENDPOINTSThis is the so
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2x1 Mirror CHANGEMIRRORENDPOINTS Co
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CLEARASR_OKSYS1.MYDOM.LOCAL;J;172.1
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CREATEMIRRORCREATEMIRROREMCMD CREA
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GETASR_OKThis command will notify D
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GETJOBINFOThis command returns exte
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GETREMOTEBITMAP4: Mirror is paused5
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GETSNAPSHOTLOCATIONDriver Version =
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GETVOLUMEINFO1: Mirroring2: Mirror
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LOCKVOLUMERAW filesystemFAT filesys
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RESTARTVOLUMEPIPEWriteQueueLowWater
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STOPSERVICEThis command sets the sn
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UPDATEVOLUMEINFOUPDATEVOLUMEINFOEMC
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One-to-OneExample:USECASEReplicate
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One-to-Many (Multiple Targets)One-t
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N-Shared-Disk Replicated to OneAddi
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N-Shared-Disk Replicated to Multipl
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Disconnecting from a ServerDisconne
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Creating Mirrors With Shared Volume
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Safe Creation of a Shared-Storage V
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Switchover and Failover with Multip
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Source Server Failure - Manual Swit
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Renaming a JobRenaming a Job1. Sele
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Requirements for SwitchoverNote: If
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Breakusually much quicker than a fu
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Shared Volume Procedure - Basic Dis
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Mirror PropertiesThis dialog displa
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Working With Shared VolumesWorking
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Using Microsoft iSCSI Target With D
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Installation of the iSCSI Target2.
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Creation of Mirror and Configuratio
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Creation of iSCSI Virtual Disks8. S
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Setting Up Multiple Virtual Disks W
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DataKeeper Target Snapshot5. Right-
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Local WriteIf the block has not bee
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Snapshot Location SizeIMPORTANT: Th
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Snapshot Location SelectionWhen cli
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Source Out of ServiceSource Out of
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TargetSnapshotBlocksize Registry Va
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Create and Configure a Hyper-V Virt
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Create and Configure a Hyper-V Virt
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Install an Operating System and Any
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Configure the Target Server to Run
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Planned/Unplanned SwitchoverPlanned
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Unplanned Switchover5. Log into the
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Chapter 6: Frequently Asked Questio
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Inability to Create a Mirror• Sou
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Split-Brain FAQsAnswerYes, beginnin
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Using Volume Shadow CopyReplication
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Chapter 7: TroubleshootingThe topic
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Counter Logs Do Not Work on Windows
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System Event Log - Create Mirror Fa
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Windows Server 2012 MMC Snap-in Cra
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Creating Mirrors with Shared Volume
Page 186 and 187:
Windows Server 2012 NIC Teaming Iss
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CHKDSKThis command, which is used t
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IndexIndexAAsynchronous 11Change Mi
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IndexFilename 154Firewall 32Full Re
Page 194 and 195:
IndexPerformance Monitor Counters 1
Page 196:
IndexVolume 18Size 18Volume Shadow
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DataKeeper for Windows All Documentation - SIOS

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