Parallel ZFS mounting
Parallel mounting of ZFS filesystem was introduced in r344569 and is great for shortening the boot time. The change creates a cosmetic problem, partial ordering of the mounted filesystems. Here’s a shell script coercing the output of df(1) into a comprehensible listing.
#!/bin/sh
#-
# Parallel mounting of ZFS filesystems leads to partial ordering of the
# mounted filesystems.
# Separating the header from the remaining lines and sorting the latter
# before recombining is a viable solution.
#-
# https://lists.freebsd.org/pipermail/freebsd-current/2019-March/073016.html
# https://lists.freebsd.org/pipermail/freebsd-current/2019-March/073022.html
/bin/df ${@} | /usr/bin/awk '/^Filesystem/ { print; sort = "/usr/bin/sort -sk " NF-1 } ! /^Filesystem/ { print | sort }'
# df-sorted.sh
Here’s a listing produced by plain df(1) on FreeBSD/amd64 base/head r344876:
Filesystem Size Used Avail Capacity Mounted on zroot/ROOT/20190307-r344876 14G 1,6G 13G 11% / devfs 1,0K 1,0K 0B 100% /dev zroot/usr/compat 13G 29K 13G 0% /usr/compat zroot/tmp 1,0G 49K 1,0G 0% /tmp zroot/var/synth 13G 34K 13G 0% /var/synth zroot/home 13G 29K 13G 0% /home zroot/usr/local 13G 547M 13G 4% /usr/local zroot/var/lib 13G 29K 13G 0% /var/lib zroot/var/tmp 1,0G 30K 1,0G 0% /var/tmp zroot/var/log 13G 13M 13G 0% /var/log zroot/var/unbound 13G 29K 13G 0% /var/unbound zroot/var/run 13G 48K 13G 0% /var/run zroot/var/Named 13G 29K 13G 0% /var/Named zroot/var/audit 13G 29K 13G 0% /var/audit zroot/var/db/boinc 13G 29K 13G 0% /var/db/boinc zroot/var/db/mysql 13G 29K 13G 0% /var/db/mysql zroot/media 13G 32K 13G 0% /media zroot/var/db/tlpkg 13G 29K 13G 0% /var/db/tlpkg zroot/usr/src 15G 2,3G 13G 15% /usr/src zroot/var/db/ports 13G 187K 13G 0% /var/db/ports zroot/var/db/bacula 13G 29K 13G 0% /var/db/bacula zroot/var/db/pkg 13G 37M 13G 0% /var/db/pkg zroot/var/spool 13G 32K 13G 0% /var/spool zroot/var/db/hyperv 13G 29K 13G 0% /var/db/hyperv zroot/var/crash 13G 30K 13G 0% /var/crash zroot/var/db/etcupdate 13G 1,0M 13G 0% /var/db/etcupdate zroot/var/backups 13G 10M 13G 0% /var/backups zroot/var/db/fontconfig 13G 29K 13G 0% /var/db/fontconfig zroot/var/db/mysql_secure 13G 29K 13G 0% /var/db/mysql_secure zroot/var/db/mysql_tmpdir 13G 29K 13G 0% /var/db/mysql_tmpdir zroot/nfs 13G 29K 13G 0% /nfs zroot/usr/ports 14G 1,3G 13G 9% /usr/ports zroot/var/synth/live_packages 13G 452M 13G 3% /var/synth/live_packages zroot/usr/obj 18G 5,2G 13G 29% /usr/obj zroot/var/mail 13G 896K 13G 0% /var/mail zroot/var/cache/pkg 13G 29K 13G 0% /var/cache/pkg zroot/usr/compat/linux 13G 31K 13G 0% /usr/compat/linux zroot/var/empty 13G 29K 13G 0% /var/empty zroot/usr/local/tests 13G 29K 13G 0% /usr/local/tests zroot/usr/local/certs 13G 29K 13G 0% /usr/local/certs zroot/usr/local/etc 13G 676K 13G 0% /usr/local/etc zroot/home/trond 13G 1,2M 13G 0% /home/trond zroot/usr/local/info 13G 31K 13G 0% /usr/local/info zroot/var/synth/builders 13G 31K 13G 0% /var/synth/builders zroot/var/spool/ftp 13G 29K 13G 0% /var/spool/ftp zroot/var/spool/mqueue 13G 29K 13G 0% /var/spool/mqueue zroot/usr/local/var 13G 29K 13G 0% /usr/local/var zroot/usr/local/www 13G 29K 13G 0% /usr/local/www zroot/var/log/synth 13G 5,4M 13G 0% /var/log/synth zroot/usr/local/pgsql 13G 29K 13G 0% /usr/local/pgsql zroot/var/spool/clientmqueue 13G 163K 13G 0% /var/spool/clientmqueue zroot/usr/ports/workdirs 13G 29K 13G 0% /usr/ports/workdirs zroot/usr/ports/packages 13G 29K 13G 0% /usr/ports/packages zroot/usr/ports/distfiles 14G 1,0G 13G 8% /usr/ports/distfiles zroot/usr/local/pgsql/data 13G 29K 13G 0% /usr/local/pgsql/data zroot/usr/local/pgsql/data/base 13G 29K 13G 0% /usr/local/pgsql/data/base zroot/usr/local/pgsql/data/pg_xlog 13G 29K 13G 0% /usr/local/pgsql/data/pg_xlog zroot/var/cache/ccache 14G 1,5G 13G 11% /var/cache/ccache fdescfs 1,0K 1,0K 0B 100% /dev/fd procfs 4,0K 4,0K 0B 100% /proc devfs 1,0K 1,0K 0B 100% /usr/compat/linux/dev fdescfs 1,0K 1,0K 0B 100% /usr/compat/linux/dev/fd linprocfs 4,0K 4,0K 0B 100% /usr/compat/linux/proc linsysfs 4,0K 4,0K 0B 100% /usr/compat/linux/sys
Here’s a listing produced by df-sorted.sh -ah on the same system:
Filesystem Size Used Avail Capacity Mounted on zroot/ROOT/20190307-r344876 14G 1,6G 13G 11% / devfs 1,0K 1,0K 0B 100% /dev fdescfs 1,0K 1,0K 0B 100% /dev/fd zroot/home 13G 30K 13G 0% /home zroot/home/trond 13G 1,2M 13G 0% /home/trond zroot/media 13G 32K 13G 0% /media zroot/nfs 13G 30K 13G 0% /nfs procfs 4,0K 4,0K 0B 100% /proc zroot/tmp 1,0G 49K 1,0G 0% /tmp zroot/usr/compat 13G 30K 13G 0% /usr/compat zroot/usr/compat/linux 13G 31K 13G 0% /usr/compat/linux devfs 1,0K 1,0K 0B 100% /usr/compat/linux/dev fdescfs 1,0K 1,0K 0B 100% /usr/compat/linux/dev/fd linprocfs 4,0K 4,0K 0B 100% /usr/compat/linux/proc linsysfs 4,0K 4,0K 0B 100% /usr/compat/linux/sys zroot/usr/local 13G 547M 13G 4% /usr/local zroot/usr/local/certs 13G 30K 13G 0% /usr/local/certs zroot/usr/local/etc 13G 676K 13G 0% /usr/local/etc zroot/usr/local/info 13G 31K 13G 0% /usr/local/info zroot/usr/local/pgsql 13G 30K 13G 0% /usr/local/pgsql zroot/usr/local/pgsql/data 13G 30K 13G 0% /usr/local/pgsql/data zroot/usr/local/pgsql/data/base 13G 30K 13G 0% /usr/local/pgsql/data/base zroot/usr/local/pgsql/data/pg_xlog 13G 30K 13G 0% /usr/local/pgsql/data/pg_xlog zroot/usr/local/tests 13G 30K 13G 0% /usr/local/tests zroot/usr/local/var 13G 30K 13G 0% /usr/local/var zroot/usr/local/www 13G 30K 13G 0% /usr/local/www zroot/usr/obj 18G 5,2G 13G 29% /usr/obj zroot/usr/ports 14G 1,3G 13G 9% /usr/ports zroot/usr/ports/distfiles 14G 1,0G 13G 8% /usr/ports/distfiles zroot/usr/ports/packages 13G 30K 13G 0% /usr/ports/packages zroot/usr/ports/workdirs 13G 30K 13G 0% /usr/ports/workdirs zroot/usr/src 15G 2,3G 13G 15% /usr/src zroot/var/audit 13G 30K 13G 0% /var/audit zroot/var/backups 13G 10M 13G 0% /var/backups zroot/var/cache/ccache 14G 1,5G 13G 11% /var/cache/ccache zroot/var/cache/pkg 13G 30K 13G 0% /var/cache/pkg zroot/var/crash 13G 30K 13G 0% /var/crash zroot/var/db/bacula 13G 30K 13G 0% /var/db/bacula zroot/var/db/boinc 13G 30K 13G 0% /var/db/boinc zroot/var/db/etcupdate 13G 1,0M 13G 0% /var/db/etcupdate zroot/var/db/fontconfig 13G 30K 13G 0% /var/db/fontconfig zroot/var/db/hyperv 13G 30K 13G 0% /var/db/hyperv zroot/var/db/mysql 13G 30K 13G 0% /var/db/mysql zroot/var/db/mysql_secure 13G 30K 13G 0% /var/db/mysql_secure zroot/var/db/mysql_tmpdir 13G 30K 13G 0% /var/db/mysql_tmpdir zroot/var/db/pkg 13G 37M 13G 0% /var/db/pkg zroot/var/db/ports 13G 187K 13G 0% /var/db/ports zroot/var/db/tlpkg 13G 30K 13G 0% /var/db/tlpkg zroot/var/empty 13G 30K 13G 0% /var/empty zroot/var/lib 13G 30K 13G 0% /var/lib zroot/var/log 13G 13M 13G 0% /var/log zroot/var/log/synth 13G 5,4M 13G 0% /var/log/synth zroot/var/mail 13G 896K 13G 0% /var/mail zroot/var/Named 13G 30K 13G 0% /var/Named zroot/var/run 13G 48K 13G 0% /var/run zroot/var/spool 13G 32K 13G 0% /var/spool zroot/var/spool/clientmqueue 13G 163K 13G 0% /var/spool/clientmqueue zroot/var/spool/ftp 13G 30K 13G 0% /var/spool/ftp zroot/var/spool/mqueue 13G 30K 13G 0% /var/spool/mqueue zroot/var/synth 13G 34K 13G 0% /var/synth zroot/var/synth/builders 13G 31K 13G 0% /var/synth/builders zroot/var/synth/live_packages 13G 452M 13G 3% /var/synth/live_packages zroot/var/tmp 1,0G 30K 1,0G 0% /var/tmp zroot/var/unbound 13G 30K 13G 0% /var/unbound