Dell DES-1423 - Questions & Answers

It's OneFS FEC protection nomenclature for our "hybrid" protection polices. More generally, it's written as:
N+M/b where "N" is the number of data stripe units in a stripe, "M" is the number of FEC stripe units in a stripe, and "b" is the number of stripe units in a stripe which are allowed to reside on the same node.
References:
https://www.dell.com/community/Isilon/Isi-get-output/td-p/7085467

References:
http://doc.isilon.com/onefs/7.2.0/help/en-us/GUID-398C2422-1CA5-4AE0-8F3D-09F589C82E6E.html

References:
http://doc.isilon.com/onefs/8.0.0/help/en-us/ifs_r_link_aggregation_methods.html

With copy on write, as the name suggests, a new write to HEAD results in the old blocks being copied out to the snapshot version first. Although this incurs a double write penalty, it results in less fragmentation of the HEAD file, which is better for cache prefetch, etc.
Typically, CoW is most prevalent in OneFS and is primarily used for small changes, inodes and directories.
References:
https://www.dellemc.com/resources/en-us/asset/white-papers/products/storage/h15048-wp-next-gen-data-protection-snapshot-iq.pdf

Groupnets are designed to enable multi-tenant DNS support per access zone.
References:
https://www.dell.com/community/Isilon/Multiple-groupnets-using-the-same-subnet/td-p/7152525

References:
https://www.commoncriteriaportal.org/files/epfiles/383-7-148%20ST%20v1.0.pdf
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The SmartConnect Service IP (SSIP) will always reside on the lowest node (that is available) in the cluster (Node1 in most cases). This IP does not move between nodes until the lowest node number goes offline (planned/unplanned).
References:
http://www.jasemccarty.com/blog/configuring-emc-isilon-smartconnect-part-i-smartconnect-basic/

References:
http://doc.isilon.com/onefs/8.2.0/cli/ifs_r_isi_job_status_view.html