Dynamic Link Manager

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Hitachi Dynamic Link Manager (HDLM) What is the HDLM: it is a server –based software solution that directly addresses challenges associated with the single point of failure. ISCSI devices, Hitachi storage system command devices, such as Hitachi RAID Manager command devices, EMC DMX series, EMC CX series, and HP EVA series are managed by HDLM. The following attributes are available for Hitachi Dynamic Link Manager. Default Attributes. Name; productversion; type; version; Optional Attributes. Servicepack; Additional Attributes. There are no additional attributes. No reports have been developed yet.

What is the HDLM: it is a server –based softwaresolution that directly addresses challenges associated with the single point offailure.

iSCSIdevices , Hitachi storage system command devices, such as Hitachi RAID Managercommand devices, EMC DMX series, EMC CX series, and HP EVA series are managedby HDLM and tape devices and the disks on the host devices are not managed byHDLM.

EXE files such as dynamiclinkmanager.exe are categorized as Win32 EXE (Executable application) files. As a dynamiclinkmanager file, it was created for use in dynamiclinkmanager by Adobe Systems Incorporated. กระบวนการที่เรียกว่า Adobe Dynamic Link Manager.0 หรือ Adobe Dynamic Link Manager (รุ่น CC 2018) เป็นของซอฟต์แวร์ dynamiclinkmanager หรือ Adobe Dynamic Link Manager (รุ่น CC 2018) โดย Adobe Systems (www.adobe.com) หรือ Adobe.


1.Multipathing: Multiple paths can alsobe used to share I/O workloads and improves performance.

2.Path failover: By removing the threatof I/O bottlenecks, HDLM protect your data paths and increases performance andreliability.

3.Failback: By recovering a failed pathand placing it back online when it becomes available, the maximum number ofpaths available for load balancing and failover is assured.

4.Load Balancing: By allocating I/Orequest across all paths, load balancing ensures continuous operations at optimumperformances levels, along with improved system and application performance.Several load balancing policies are supported.

Since HDLM automatically perform path health checking, the need toperform repeated manual path status checks is eliminated.

With multi-pathing, a failure with one or more components still allowsapplications to access their data. In addition to providing fault tolerance,multi-pathing also serves to redistribute the read/write load among multiplepaths between the server and storage, helping to remove bottlenecks and balanceworkloads. In addition, distributing data access across all the available pathsincreases performance, allowing more application to be run and more work to beperformed in a shorter period of time.

How HDLM works:

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1.HDLM driver interfaces with HBAdriver or multipathing framework provided by OS.

2.Assign a unique identifier to pathsbetween each storage devices and host.

Dynamic Link Manager

3.Distributes application I/O acrosseach path according to fail-over and load balancing.

4.When a path fails, all outstandingand subsequent I/O request shift automatically and transparently from failed ordown path to alternative paths.

Two types of failover happen: Automatic and manual.

Failover keeps yourmission critical operation running without interruptions, storage assets ismaximized, and business operations remain online.

The path can go offline due to thefollowing reasons.

2.A user intentionally placed the pathoffline by using the path management window in the HDLM GUI.

3.A user executed the HDLM commandsoffline operations.

How To Close Dynamic Link Manager On Mac


4.Hardware, such as cables or HBAs, hasbeen removed.

You can manually place a path onlineor offline by doing the following:

2.Execute the “dlnkmgr” command’sonline or offline operation.

The algorithmsused for the load balancing are the “round robin”. This algorithm simplydistributes I/O by alternating request across all available data paths. Somemultipath solutions, such as the IBM MPIO default PCM, only provide this typeof load balancing.

Mac
If we usethe Extended Round-robin for the load balancing then it distributes I/O topaths depending on whether the I/O involves sequential or random access:

Dynamic Link Manager
. Forsequential access, a certain number of I/O is issued to one path in succession.The next path is chosen according to the round robin algorithm.

. For randomaccess, I/O is distributed to multiple paths according to the round-robinalgorithm.

To centrally manage the multiple HDLMinstances by Hitachi Global Link manager (HGLM).

By HGLM wecan centrally administrator multiple HDLM multipath environment from singlepoint of control and consolidate and present complex multipath configurationinformation on simplified host and storage centric views.

Summary:

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1.Provides a centralized facility formanaging path failover, automatic failback, and selection of I/O balancingtechniques thorugh integration with Hitachi Global link Manager.

2.Eases installation and use throughauto-discovery function, which automatically detects all available paths forfailover and load balancing.

3.Provides one path-management tool forall operating systems, Includes the CLI that allows administrators flexibilityin managing paths across networks.

4.Provides manual and automatic failoverand failback support.

5.Monitors status of online pathsthrough a health –check facility at customer-specified intervals, and places afailed path offline when an error is detected.


SPARC: How to Add Sun StorEdge 9900 Dynamic Link Manager Software

Use this procedure to add Sun StorEdge 9900 Dynamic Link Manager (Sun SDLM) software in a running cluster.

Do not use this procedure to convert from host-based mirroring to a multipathingsolution. For the procedure on how to convert from host-based mirroring to a multipathingsolution, contact your Sun service provider.

Perform this procedure on one node at a time. This procedure defines Node N as the node on which you are installing the multipathing software.

Dynamic Link Manager.exe

Before You Begin

Dynamic Link Manager Download

This procedure assumes that you installed and configured your storage array.If you have not installed your storage array, see SPARC: How to Install Sun StorEdge 9900 Dynamic Link Manager Software to add multipathingsoftware and the storage array at the same time.

Steps

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  1. Determine the resource groups and devicegroups that are running on Node N.

    Record this informationbecause you use this information in Step 11 of this procedure to return resource groups and device groupsto these nodes.


    For more information, see the Sun Cluster system administration documentation.

  2. Move all resource groups and devicegroups off Node N.


    Kingdom come deliverance console commands spawn horse. For more information, see the Sun Cluster system administration documentation.

  3. Do you need to install additional physicalpaths between Node N and the storage?

    Note –

    If you use multipathing software, each node requires two paths to thesame set of LUNs. For an example configuration, see Figure 2–1.

    • If no, skip to Step 8.

    • If yes, proceed to Step 4.

    For the procedure on how to install host adapters, see the documentation thatshipped with your host adapters and nodes.

  4. Shut down and power off NodeN.

    For the full procedure on how to shut down and power offa node, see Sun Cluster system administration documentation.

  5. Install the host adapters and the cablesbetween Node N and the storage.

    For the procedure onhow to install host adapters, see the documentation that shipped with your host adaptersand nodes.

  6. Power on and boot Node N intonon-cluster mode.

    For more information on booting nodes, see Sun Cluster system administration documentation.

  7. If necessary, upgrade the host adapterfirmware on Node N.

    PatchPro is a patch-management tool that eases the selection anddownload of patches required for installation or maintenance of Sun Cluster software.PatchPro provides an Interactive Mode tool especially for Sun Cluster. The InteractiveTool makes the installation of patches easier. PatchPro's Expert Mode tool helps youto maintain your configuration with the latest set of patches. Easeus data recovery gratuit mac. Expert Mode is especiallyuseful for obtaining all of the latest patches, not just the high availability andsecurity patches.

    To access the PatchPro tool for Sun Cluster software, go to http://www.sun.com/PatchPro/, click Sun Cluster, then choose eitherInteractive Mode or Expert Mode. Follow the instructions in the PatchPro tool to describeyour cluster configuration and download the patches.

    For third-party firmware patches, see the SunSolveSM Online site at http://sunsolve.ebay.sun.com.

  8. Install and configure Sun SDLM softwareon Node N, and apply required patches for Sun SDLM softwaresupport on Node N.

    For instructions on how to installand configure the Sun SDLM software, see the documentation that shipped with your storage array.

  9. Did you perform a reconfiguration reboot when you configured Sun SDLM software?

    • If yes, proceed to Step 10.

    • If no, perform a reconfiguration reboot to create the new Solaris devicefiles and links on Node N.


  10. On Node N, updatethe paths to the device ID instances.


  11. Return the resource groups and devicegroups that you identified in Step 1 to Node N.


    For more information, see the Sun Cluster system administration documentation.

  12. On all remaining nodes and one nodeat a time, repeat Step 1 through Step 11.