On 2/12/20 7:53 AM, Dave Ulrick wrote:
Interesting thought. I can envision how a lookup for /var/xyz could
cause everything under /var to be looked up, and I can see how
/var/cache or /var/run would be frequently read. I'll try mounting a
green USB drive's file system at a third-level directory (e.g.,
/var/backups/0) or under a less popular directory (e.g., /mnt/backups)
and see if that behaves any differently.
I ran 'strace' on 'ls' but nothing interesting showed up. Then, I ran
'strace' on 'bash'. I ran 'ls' from 'bash' and then exited. The strace
log shows two connect()s to a socket file under /var/run:
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) =
-1 ENOEN
T (No such file or directory)
close(3)
/var/run/nscd/socket appears to be related to the 'nscd' DNS cache which
I am not running on my PCs.
So, it looks likely that reading /var/run caused the contents of /var to
be read. This would have triggered a wakeup of the device hosting
/var/backups which would be a cause of its hard drive spinning up.
In addition to one PC that mounted a green USB drive under /var I had
several other PCs that mounted a NAS under /var. That NAS is intended to
store backup files so its hard drive is configured to spin down after 10
idle minutes.
In view of these findings, I've reconfigured my PCs to mount the backups
directory under /mnt instead of /var. So far since doing so I've not
noticed any spin-up delays related to a USB hard drive or the backup NAS.
Thanks, Tim!
Dave
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