Skip to main content
NetApp Knowledge Base

Solaris Host support recommended settings in SnapMirror Business Continuity (SM-BC) configuration

  1. Last updated
  2. Save as PDF
Views:
417
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
DP
Last Updated:

Applies to

  • Solaris 11.3,11.4 with SnapMirror Business Continuity (SM-BC)
  • Solaris SPARC and x86_64 Platform
  • ONTAP 9.9.1 and later

Issue

IO error/outage may be observed on Solaris hosts after SM-BC Automatic Unplanned Site FailOver (AUFO) workflows is exercised using default Solaris OS settings

Limitations:

  • SM-BC ensures business continuity in case of a cluster/site disaster. In case of a disaster scenario, when the site hosting the primary cluster experiences a disaster, the host multipathing software marks all paths through the primary cluster as down and as part of the site failover, I/O resumes via the secondary cluster paths.
  • In the event of a disaster, the SCSI failover characteristics (ALUA) on various paths to the same LUN toggle between Active Optimized (AO) and Active Non-Optimized (ANO)
  • With the Solaris OS default settings, Solaris Multipathing (MPxIO/scsi_vhci) fails to enumerate the paths when there is a change in SCSI failover characteristics. Ideally it should re-probe all paths again to figure out if the characteristics of previously probed paths have changed. Instead, it results in a hard I/O error.
  • Sample messages expected in /var/adm/messages as illustrated below:

Jul 31 xx:xx:xx host-A scsi_vhci: [ID 721035 kern.warning] WARNING: scsi_vhci: failover contradiction: 'f_tpgs'.vs.'f_tpgs': path /pci@400/pci@1/pci@0/pci@0/fibre-channel@0,1/fp@0,0/disk@w200300a098dfd69d,0

 

 

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.