The shelf moved from iz-pve1 to iz-pve0, which has two SAS HBAs and an
internal backplane that is itself behind an expander. The default
"*-sas-exp*" glob matched all 17 drives there, so the shelf's fans would
have been set from the server's own drive temperatures.
PORT and DISK_GLOB are now overridable from the unit. Documents that the
host holding the shelf also needs the mirror-image DISK_EXCLUDE_PATTERN
in fan_speed.service - it was counting 17 disks until that was set.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
das_fanctl.sh reads drive temps via smartctl (falling back to the EMM
backplane sensors), interpolates a fan percentage, and re-sends _shutup
on a 5s keepalive so the shelf does not revert to full speed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
