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  1. Home
  2. NetBackup™ Deduplication Guide
  3. MSDP volume group (MVG)
  4. The MSDP server maintenance
NetBackup™ Deduplication Guide

The MSDP server maintenance

In a routine node maintenance such as upgrade, EEB installation, OS patching, and system restart we recommend that you intervene to reduce the impact on deduplication ratio or a job failure.

Use MSDP command-line of the MVG server or NetBackup web UI to set the node in the maintenance mode before the routine maintenance and reset afterwards. The MVG server does not move the client policy assignment from the node in maintenance to another node. The new backup jobs may fail temporarily if the node is not stable or functional during the maintenance.

Run the following MSDP commands on the MVG server:

cacontrol --mvg set-mvg-maintenance <msdp-server>

cacontrol --mvg unset-mvg-maintenance <msdp-server>

cacontrol --mvg get-mvg-maintenance

Example:

PATH=$PATH:/usr/openv/pdde/pdcr/bin
cacontrol --mvg set-maintenance-mode vramvg037340.rsv.ven.veritas.com
Updated virtual volumes: mvg-local
cacontrol --mvg get-maintenance-mode
MSDP servers in maintenance mode: vramvg037340.rsv.ven.veritas.com
Virtual volumes which have the MSDP servers in maintenance mode: mvg-local
cacontrol --mvg unset-maintenance-mode vramvg037340.rsv.ven.veritas.com
Updated virtual volumes: mvg-local
cacontrol --mvg get-maintenance-mode
No MSDP servers found in maintenance mode.

On the NetBackup web UI, go to the Disk Pool webpage of an MVG volume, select and edit a disk volume of an MVG volume, then switch the mode between "Maintenance" and "Normal".

Alternatively, you can deactivate the corresponding backup policies temporally during the node maintenance.

Alternatively, if the maintenance cycle is short, you can use or tune out the MVG rebalance freezing time on the MVG server, so that the MVG server does not move the client policy assignment out if the node can be back to stable within the MVG rebalance freezing time. By default, the value is 0.5 hour. It can be tuned by MVG Controller API:

curl -K /uss/config/certificates/controller/.curl_config https://localhost:10100/v1/agent/mvg/loadbalance/config -d '{"asmt_rb_freezing_timeout": 3600 }' -X PATCH

Check the tuning parameters:

curl -K /uss/config/certificates/controller/.curl_config https://localhost:10100/v1/agent/mvg/loadbalance/config

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