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[DSS V7] Is it possible to extend NAS LV with shares in Active-Active HA NFS cluster in a production environment without any downtime?

Article ID: 2941
Last updated: 05 May, 2020

Additional information:

  • product name: DSS V7
  • product version: all
  • build: all

Subject:

Is it possible to extend NAS LV with shares in Active-Active HA NFS cluster in a production environment without any downtime?

Contents:

Unfortunately, this will cause NFS session/connection reset, as explained in the following NAS LV expanding procedure:

Resizing NAS LV in NFS cluster will cause shares residing on the LV in question to be inaccessible for ~1-4s. Thus, we do recommend modifying NAS LV size during maintenance window / planned downtime.

Please note that the procedure itself requires:

​​​​
1. moving all resources to one node
2. enabling "maintenance mode"
3. stopping the cluster with Virtual IPs enabled
4. stopping all replication tasks
5. removing NFS tasks from resources manager/pool
6. removing all replication tasks
7. disabling replication on an LV in question [Volume Manager > Modify LV > uncheck "use replication"]: this part will cause an interruption in access to NFS share
8. resizing NAS LV
9. re-enabling replication on a NAS LV - this part will cause an interruption in access to NFS share
10. creating new replication tasks
11. launching replication tasks
12. adding NFS tasks to resource manager/pool
13. running the cluster

The above procedure is applicable only when there's still some free space on a VG, in case you need to extend your RAID VD you'd also have to execute "PVRESIZE" via DSS CLI.


 

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Article ID: 2941
Last updated: 05 May, 2020
Revision: 2
Views: 369
Posted: 21 Dec, 2017 by Kowalski .
Updated: 05 May, 2020 by Rybak M.
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