Wonder of wonders, during the reinstall of about 1000 ports after this upgrade, the disk started failing with reallocated sectors*. Luckily I had backups and am typing from a fully recovered system.
* at first just /var and I thought it was okay
[ edit: I removed the/var filesystem and recreated it later on the disk ]
* then /usr as I started backups from the restored /var filesystem disk.
.....................................
And for completeness, I would like any expert to chime in as to
which /var subdirectories need to be restored from backup,
all I did was cron, pkg, and maybe another.
[edit: after restoring the hierarchy with mtree.
]
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Along the way, had to re learn the mountroot> syntax:
ufs:/dev/gpt/........root
, nothing more on the line