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Custom Reports Using Data Collectors

Volume Replicator (VVR) RVG and RLINK state check.

Check category: Availability


Check description: Checks whether the Replicated Volume Group (RVG) and its corresponding Replication Link (RLINK) are in stopped, paused or failed state. These states indicate that Volume Replicator (VVR) replication is not occurring appropriately.


Check procedure:

  • The check identifies all the Replicated Volume Groups (RVGs) and the corresponding Replication Links (RLINKs).
  • The check determines whether RVGs and RLINKs are in the ACTIVE state.


Check recommendation: Make sure that Replicated Volume Group (RVG) and corresponding Replication Link (RLINK) are in the ACTIVE state


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Volume Replicator Administrator's Guide

Volume Replicator version consistency

Check category: Availability


Check description: Checks that the same version of Volume Replicator (VVR) is installed on all VVR nodes.


Check procedure:

  • Determines whether Volume Manager (VxVM) is installed on all the nodes.
  • Verifies that VVR has the same version across all the nodes.


Check recommendation: Make sure that VxVM is installed on all the nodes, the license key for VVR is enabled and the VVR versions are same across all the nodes.


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Volume Replicator Administrator's Guide

Volume Replicator SRL protection

Check category: Best practices


Check description: Checks whether the Storage Replicator Log (SRL) protection is set to DCM (Data Change Map). This prevents full resynchronization if the SRL overflows.


Check procedure:

  • Determines all the Replicated Volume Groups (RVG's) on the host.
  • Checks if the SRL protection is set to 'dcm' or 'autodcm' mode.


Check recommendation: Make sure that DCM logging is used to prevent full resynchronization of the Replicated Data Set (RDS) if the SRL overflows. To set SRL protection to autodcm, enter the following command:

# /opt/VRTS/bin/vradmin <diskgroup> set <local_rvgname> <sec_hostname> srlprot=autodcm


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Volume Replicator Administrator's Guide

Volume Replicator (VVR) Storage Replicator Log (SRL) space reserved check

Check category: Best practices


Check description: Checks whether the disks used for the SRL volume are marked as reserve for dedicated use. This ensures that only the SRL volume occupies the disk(s).


Check procedure:

  • Finds all the disks used by the SRL volume in a particular Replicated Volume Group (RVG).
  • Determines whether these disks are marked as reserve.


Check recommendation: The check determines whether the disks used for the SRL volume are marked as reserve to avoid accidental use of it for data volumes. It will ensure that only the SRL volume occupies the disk(s).


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Volume Replicator Administrator's Guide

Volume Replicator (VVR) SRL striped and mirrored

Check category: Best practices


Check description: Checks whether the Storage Replication Log (SRL) volume is striped and mirrored for optimum performance and availability of the replication solution.


Check procedure:

  • Determines all the Replicated Volume Groups (RVG's) on the host.
  • Checks if the SRL volume is both striped and mirrored.


Check recommendation: If you do not use a hardware RAID, make sure that the SRL volume is striped and mirrored for optimum performance and availability of the replication solution. To create a stripe-mirror volume, enter the following command:

# /opt/VRTS/bin/vxassist -g <diskgroup> make <SRL volume name> <size> layout=stripe-mirror


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Volume Replicator Administrator's Guide

Volume Replicator (VVR) network bandwidth limit

Check category: Best practices


Check description: Checks whether the bandwidth throttling is enabled and reports the user to verify if it is the intended configuration. If the bandwidth_limit attribute is set to none, VVR uses all the available network bandwidth (i.e. Bandwidth throttling is disabled).


Check procedure:

  • Determines all the Replicated Volume Groups (RVG) on the host.
  • Checks if bandwidth throttling is enabled as an intended configuration.


Check recommendation: Make sure that bandwidth throttling is enabled as an intended configuration. To set bandwidth limit to a particular value enter:

# /opt/VRTS/bin/vradmin <diskgroup> set <local_rvgname> <sec_hostname> bandwidth_limit=<value>


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Volume Replicator Administrator's Guide

Volume Replicator (VVR) consistent data and Storage Replicator Log (SRL) volume names.

Check category: Best practices


Check description: Checks if the data names and SRL volume names are the same across all nodes in a Replicated Data Set (RDS).


Check procedure:

  • The check reads all the data and SRL volume names in a Replicated Data Set (RDS).
  • The check verifies that the names are identical across all nodes.


Check recommendation: Make sure that the data names and SRL volume names are the same in a Replicated Data Set (RDS).


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Volume Replicator Administrator's Guide

Volume Replicator (VVR) consistent data and SRL volume sizes.

Check category: Best practices


Check description: Checks if the data volume and SRL volume sizes are the same across all nodes in a Replicated Data Set (RDS).


Check procedure:

  • The check reads all the data and SRL volume sizes in a Replicated Data Set (RDS).
  • The check verifies that the data sizes and SRL volume sizes are identical across all nodes.


Check recommendation: Make sure that the data and SRL volume sizes are the same in a Replicated Data Set (RDS).


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Volume Replicator Administrator's Guide

VVR 5.0 disk group layout

Check category: Best practices


Check description: Checks whether VVR 5.0 is installed and the disk group version is 140 or greater.


Check procedure:

  • Determines whether Storage Foundation 5.0 is installed on the system.
  • Determines whether VVR is enabled on the system.
  • When VVR is enabled, identifies the disk groups present on the system and checks whether the disk group version is 140 or greater.


Check recommendation: The disk group(s) have layout version(s) less than 140. It is recommended that you upgrade the disk group layout version. If the disk group version is not upgraded to version 140 or greater, replication and I/O may stop responding after you upgrade to Volume Replicator 5.0, 5.0MP1, 5.0MP2, and 5.0MP3. Upgrade the disk group to the latest version (140) using following command:
#vxdg upgrade diskgroup_name


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Upgrading a disk group
Refer the technote for more information

 
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