Secondary SD warnings

Replication and Disaster Recovery Administration Guide for Hitachi NAS Platform

Version
15.1.x
Audience
anonymous
Part Number
MK-92HNAS009-29

On most configurations, the NAS server warns (using the event log and the trouble command) if S-Vols become unhealthy or uncontactable, such that failover is impossible. On some advanced systems, such as when the S-Vols belong to another cluster, these warnings are undesirable. The following commands instruct the NAS server not to warn about S-Vols in the span on which you run them:

  • span-deny-access --primaries
  • span-deny-access --secondaries.
The following commands instruct the NAS server to warn about S-Vols in the span on which you run them:
  • span-allow-access
  • span-break-mirrors
  • sd-mirror (if used to break all the mirror relationships in the span)

To license all the SDs in a span but not warn about the health of backup SDs, use the sd-allow-access command instead of the span-allow-access command.

A mirrored span is always healthy as long as it has a complete set of licensed, primary, healthy SDs and no unexpected primary-primary relationships (a primary-primary relationship is expected and ignored if only one of the SDs is licensed). If you have set up SD sites (see above), then all the primary SDs must be in the same site. There is specifically no requirement for the secondary SDs to be healthy; they need not even still exist.