OpenBSD File systems , on Flash / SSD CPE (in sites with uncontrolled power (CPE customer sites)

Hello, Folks,

Im reviewing our filesystem setup for OpenBSD CPEs that we deploy in the
field

in order to minimise the impact of Power Outages / Customer interference on
the boxes,
we install a 4G root partition /
and a 2GB /usr/local (to allow the wxallowed flag for the filesystem)

we use mfs for /tmp and /var so that there the probability that there is a
filessytem write to the SSD is reduced (so that power failures dont cause
file system corruption)

we use the following fstabl

#########begin /etc/fstab/###########
/dev/sd0a / ffs rw 1 1
/dev/sd0d /usr/local ffs rw,wxallowed,nodev 1 1
swap /tmp mfs rw,nosuid,noexec,nodev,-s=256000,-P=/persist-fs/tmp 0 0
swap /var mfs rw,nosuid,noexec,nodev,-s=512000,-P=/persist-fs/var 0 0
swap /dev mfs rw,nosuid,noexec,-P=/persist-fs/dev,-i=2048,-s=102400 0 0
########