Dell VNX5600 VDM MetroSync For VNX2 - A Detailed Review

Dell VNX5600 Manual

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  • Dell VNX5600 | VDM MetroSync For VNX2 - A Detailed Review - Page 1
    VDM METROSYNC FOR VNX2 A Detailed Review ABSTRACT This white paper introduces the architecture and functionality of the VDM MetroSync feature for VNX2. It also discusses VDM MetroSync Manager for automated failover and the ability to preserve asynchronous replication sessions after a reverse or
  • Dell VNX5600 | VDM MetroSync For VNX2 - A Detailed Review - Page 2
    To learn more about how EMC products, services, and solutions can help solve your business and IT challenges, contact your local representative or authorized reseller, visit www.emc.com, or explore and compare
  • Dell VNX5600 | VDM MetroSync For VNX2 - A Detailed Review - Page 3
    MirrorView 9 Configure Write Intent Logs & Clone Private LUNs 10 Enable VDM MetroSync Service 10 FSID (File System ID) Ranges 11 NAS DB Mirrors (LUN 8 11 NAS Pool Expansion 22 Limitations ...23 Troubleshooting 23 VDM METROSYNC MANAGER 24 Configuration 24 VDM MetroSync Manager Sessions 25
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    VDM MetroSync Manager Service 28 Configure ...31 Management 31 Help ...31 PRESERVE REPLICATOR SESSIONS 31 Overview ...31 Configuration 31 Establish Control Station Interconnects 31 Establish Data Mover Interconnects 32
  • Dell VNX5600 | VDM MetroSync For VNX2 - A Detailed Review - Page 5
    EXECUTIVE SUMMARY Being able to access data is a critical component in the daily operation and function of many organizations. Implementing a replication solution enables data centers to avoid disruptions in business operations by providing a disaster recovery (DR) plan and additional redundancy.
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    data. Unisphere is also used for managing and monitoring other storage operations. Virtual Data Mover (VDM) - A logical container that holds the data needed to support one or more CIFS servers, NFS servers, or both CIFS and NFS servers, and their file systems. Each VDM has access only to the file
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    INTRODUCTION VDM MetroSync is a Disaster Recovery (DR) solution for VNX2 File which leverages a MirrorView/S replication session to create a zero data loss replication solution at a Virtual Data Mover (VDM) granularity. It allows for replication of a VDM along with all of its contents including file
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    is inside of the VDM. Any features or functionality that operate at the physical Data Mover or cabinet level are not included. This includes services such as DNS, NIS, NTP, local password/group files, Usermapper client, FTP/SFTP, LDAP, HTTP, CEPP, CAVA, server parameters, netgroups, nsswitch, hosts
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    Figure 1. Two Independent VNX2 Systems ESTABLISH CONTROL PATH In order to start using VDM MetroSync, there needs to be a control path between the Control Stations of both systems. This allows the two systems to establish a secure communication channel to issue commands to the other system. If a
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    a bitmap that is composed of extents indicating where data is written. The WIL consists of two LUNs, one assigned to each SP, and each LUN services all the mirrors owned by that SP that have the WIL enabled. LUNs that will be used for the WIL must be 128 MB in
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    Now configuring and rebooting secondary CS... Now enabling sync replication service on remote system... done done done done done done done These ranges are user configurable and are specified in the command to enable the service. The valid values are 1-32767. By default, a minimum of 8192 FSIDs
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    have the Synchronous Replication service enabled. It includes should build the LUNs using the same disk and RAID types on both systems. VDM MetroSync requires the use of volumes. Note that each user-defined NAS Pool can only support a single synchronously replicated VDM. This feature requires the
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    or cabinet level are not included. This includes services such as DNS, NIS, NTP, local password/group has already been created, the user must manually create an identical interface on the peer system exported by using the server_export command with the type=CA option. If necessary, the CIFS parameter
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    started and the I18N mode matches on both systems. If the service has not been started, use the server_setup command to start the CIFS service on both systems. If the I18N mode does not match, update the internationalization mode on one or both sites so they are the same. Enabling
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    Now marking remote pool as standby pool... Now creating CG... Now creating remote network interface(s)... Now updating local disk type... Now updating remote disk type... Now generating session entry... done done done done done done done done Running this command:  Creates a VDM MetroSync session
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    [yes or no] yes Now doing precondition check... done: 7 s Now doing health check... done: 11 s Now cleaning local... done: 1 s Service outage start...... Now turning down remote network interface(s)... done: 3 s Now unloading remote VDM/FS(s)/checkpoint(s)... done: 3 s Now switching the
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    the interfaces are brought up on the other system. The total time between these two events is measured and printed as the service outage. To minimize the service outage time, resources that are in use are prioritized and brought online first. Non-critical resources such as unexported, temporarily
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    used in those situations. Prior to running the failover command, confirm whether the source site is truly unavailable to clients. Depending on the type of outage, the VDM MetroSync session has a status of either in_sync or stopped. If the source site becomes completely unavailable, the VDM MetroSync
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    outage is the elapsed time between when the command is issued and when the interfaces are brought online. To minimize the service outage time, non-critical resources such as unexported, temporarily unmounted, temporarily unloaded objects, and checkpoint schedules are brought online afterwards. Once
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    Figure 7. VDM MetroSync Failover Figure 7 shows the VDM MetroSync session status after a failure on System A and a failover operation is complete. System B becomes the active system for the VDM and clients can access data from it. Note that replication between the two systems is stopped since System
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    Pool can be extended by adding new LUNs. Note that VNX File does not support extending the size of existing LUNs. Adding new LUNs to a NAS Pool that is same performance, you should build the LUNs using the same disk and RAID types on both systems. Run the nas_disk command to ensure you can see the
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    /nas/sbin/syncrep/syncrep_modify_mirror -create -session -local_disk_volumes [,,...] -remote_disk_volumes [,,...] This is an example of this command: /nas/sbin/syncrep/syncrep_modify_mirror -create -session VDM1_Session -
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    Limits VNX5400 VNX5600 VNX5800 VNX7600 VNX8000 Max Number of 128 128 128 256 512 1024 Mirrors Max Number of 64 64 64 64 64 64 Consistency Groups Max Number of 32 32 32 32 64 64 Members per CG TROUBLESHOOTING For troubleshooting and support purposes, a dedicated log is
  • Dell VNX5600 | VDM MetroSync For VNX2 - A Detailed Review - Page 24
    VDM METROSYNC MANAGER VDM MetroSync Manager is optional software that can be installed on a Windows server which works with VDM MetroSync. It provides a GUI interface that provides VDM MetroSync session information and allows for running operations such as reverse, failover, and restore. Note that
  • Dell VNX5600 | VDM MetroSync For VNX2 - A Detailed Review - Page 25
    Figure 9. VDM MetroSync Manager Summary VDM METROSYNC MANAGER SESSIONS Once the configuration wizard has been completed, the main VDM MetroSync Manager is displayed as shown in Figure 10. 25
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    Figure 10. VDM MetroSync Manager Main Window The VDM MetroSync Manager main window allows you to view a list of VDM MetroSync sessions and additional details such as status, direction, and failover settings. Each VDM MetroSync session can be configured by selecting the session and clicking the
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    the attached network interfaces should be monitored for ping connectivity. When Manual failover is selected, the user has to initiate the failover, and none of these additional options need to be configured. MANUAL OPERATIONS On the main window, you can select one or more
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    each component check is displayed in the log window. Note that manual operations cannot be run while the service is running. If a manual operation is initiated while the service is running, the user will be prompted to stop the service first. Once the operation is complete, it is important to start
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    but others result in failures. VDM MetroSync Manager only initiates a failover when a failure is detected. Event Table 3. VDM MetroSync Manager Service Checks Warnings Failures Description Remote Ping  Check remote IP ping Primary Site CS0  Check /nbsnas mount on primary site CS0
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     Description Check status of interconnect of synchronous replication session Check status of synchronous replication session If a failure is detected while the service is running, VDMs are failed over starting with the VDM with the highest priority. The log output will display the failure
  • Dell VNX5600 | VDM MetroSync For VNX2 - A Detailed Review - Page 31
    guide for VDM MetroSync Manager which describes how to use the software. The Log Collection button captures all of the VDM MetroSync Manager related logs and zips them up in a log bundle. The user will be prompted to save the zip file to a location. This is useful for troubleshooting and support
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    If a system currently is or has plans to be a dual Control Station (CS) configuration, you must first create a Control Station IP alias by using the nas_config command. This is an IP address that will always be active on the primary CS, regardless of whether it is running on CS0 or CS1. Without this
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    Lists the name and state of the Replicator sessions that can be restored. config Configures the Preserve Replicator Sessions service. restore Restores the Replicator sessions on the system. free_intermediate_data Frees the intermediate Replicator internal checkpoints after restore is complete
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    Before this feature can be used, the Preserve Replicator service must be enabled by using the config command. This is an example of this command: nas_syncrep_rr -config -enable Note:'Preserve RepV2 sessions for VDM Sync MV Replication' only supports Mirror View environment. If you're in VDM Sync
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    list of broken Replicator sessions and details including the Session Name, VDM name, Local and Remote File System/VDM, CMU, Restore State, and Session Type. This is an example of this command: nas_syncrep_rr -list Session Name FS_Rep1 FS_Rep2 VDM Name VDM1 VDM1 Local FS/VDM 5020 5021 Remote FS
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     Failed  N/A The Replicator sessions with a state of ToBeRestored can be preserved using the restore command. The Replicator sessions that have a state of OnGoing indicate that they are in the process of being restored. If the restore fails due to an error, the state results in Timeout or Failed.
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    Figure 17. Preserved Replicator Sessions Note that if you plan to reverse the VDM MetroSync session back to System A, the nas_syncrep_rr -restore command does not need to be run on System B prior to running the reverse. Once the VDM MetroSync session is active on System A again, the nas_syncrep_rr -
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    provides a GUI interface to display VDM MetroSync session information and run operations to move, failover, or restore VDMs. VDM MetroSync also supports asynchronous replication to a third system as a backup and recovery solution. When VDMs are moved or failed over between the VDM MetroSync systems
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    Replicator o Using MirrorView/Synchronous with VNX for File for Disaster Recovery o Parameters Guide for VNX for File  White Papers o Virtual Data Movers on EMC VNX on the EMC Online Support website at https://support.emc.com. After logging in to the website, click the Support by Product page, to
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WHITE PAPER
VDM METROSYNC FOR VNX2
A Detailed Review
ABSTRACT
This white paper introduces the architecture and functionality of the VDM MetroSync
feature for VNX2. It also discusses VDM MetroSync Manager for automated failover
and the ability to preserve asynchronous replication sessions after a reverse or
failover.
July, 2018