Here’s a nugget that is relevant to anyone who does CDOT implementations
and surprised me when I found it out last year. Essentially, cluster
ha modify should only be run on 2 node clusters, because cluster ha (high
availability) is different than storage failover.
Storage failover modify –mode non-ha: This is for
Single Node Clusters.
Cluster ha modify –configured true: This is for Two
Node Clusters only. This disables Epsilon (the system of
tie-breaking for 4+ node clusters).
Storage failover modify –mode ha: This controls what
we normally understand as takeover/giveback (cf enable). It is applicable
for any 2+ node cluster. This must be configured correctly for
“cluster ha modify” to work.
Lastly, if you have a 2-node cluster and you have set cluster
ha modify to true, you will need to manually set it to false
when you add nodes to grow the cluster.
Bonus link: Here is a description of which ONTAP files (q,
e, I, m) are compatible with each platform. In general, the ‘q’ file is
what you will use, in the form “814P1_q_image.tgz.” The .zip is the older format,
for use with upgrades from 7.x systems, while the .tgz is used for upgrades
from 8.x systems. Lastly, netboot is for booting systems from an image on
your laptop/server.
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