On 2/12/20 7:09 PM, Roger Heflin wrote:
It may be the pwd command doing it. It works like this:
if something runs pwd when its cwd is under say /var/log then pwd goes
through all files in /var/log until it finds .. then it goes up a
directory and repeats, until it gets to /.
That makes sense. Just occurred to me: a typical shell prompt displays
the cwd, so 'pwd' or something like it must get run just before a shell
prompt is displayed. This likely explains why I'd sometimes experience
the spin-up delay after running a command: it wasn't the command itself
necessarily that triggered the spin-up but the pwd afterwards.
Assuming that is the case your solution would be expected to work,
It seemed to work earlier today when I fired up the green USB hard drive
in that I experienced no spin-up delays, but...
if you put it under /mnt/backups then any other pwd anywhere under mnt
may also cause the spinup. On nfs mounts an nfs mount that is hanging
of say /mnt/host1 can hang everything else in /mnt even coming from
other responding hosts. the trick there is to
/mnt/host1/host1mntpoint and put each separate host in a separate top
level directory to isolate them from each other. You may not need to
do that so long as you don't have other things in /mnt being used that
may cause a pwd.
That's a great idea. I've gone ahead and implemented it on my PCs.
if you run ls -l /proc/*/cwd | more it will show you everything
running's cwd. I see /var/spool/at (atd process) with that as a home
dir, so atd doing a pwd would cause a spinup.
I don't actively use atd for anything and strace does not show atd
doing anything on my machine. If you use atd then it may be what is
doing it. nfs's statd also its cwd under var and is used on nfs
servers.
There certainly are a lot of processes on my PC running cwd. Interesting...
Thanks!
Dave
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