I'm trying to find a work-around for the following bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=838503
Package installs during imaging of a new Stretch host with a simple raid1
system disk takes ~2000 seconds. The packages installs on an equivalent Jessie
install take ~300 seconds. This may not be much of an issue for isolated host
installs, but I’m looking to speed up and automate the process to facilitate
bulk imaging.
I've found that when imaging a Stretch host, if I console in and `echo 1000 >
/proc/sys/dev/raid/speed_limit_max` I can throttle the raid sync and greatly
speed up package installs. But I have thus far only been able to do this
manually. I'm trying to find a way of setting this value early enough in
preseed that it applies throughout the bulk of the package installs. So far
I’ve attempted the following approaches (and more) without success:
* d-i preseed/early_command string echo "dev.raid.speed_limit_max =
1000" >> /etc/sysctl.conf
* No /etc/sysctl.conf file is found when I console in to check
* d-i preseed/include_command string echo 1000 >
/proc/sys/dev/raid/speed_limit_max
* When I check on the value after the command should have run, it is
still the default of “200000”
* d-i preseed/late_command string echo 1000 >
/proc/sys/dev/raid/speed_limit_max
* When I check on the value after the command should have run, it is
still the default of “200000”
* I can set the value through a late_script, but that runs well after most
of the packages have already installed.
* The command sysctl doesn’t seem to exist for this version of BusyBox
(BusyBox v1.22.1).
Can anyone provide recommendations for the appropriate method for setting this
kernel parameter during preseed at a point early enough to be useful?
