I developed a bash script to get SMART stats from hard drives and it has
been working with success for years. It is working for both Linux and
Windows using Cygwin. Recently I ran into a new installation of this
script on a Server 2022 Standard host and found it failed. On closer
examination, I found it was more than an order of magnitude slower than
on Linux. There are many calls to external programs like grep, sed, awk
and tr. The script is called by a Zabbix agent and multiple querries
are triggered at the same time. Not to be deterred, I added caching for
the SMART output with file locking to prevent conflicts to speed things
up. But the call to smartctl was not nearly as much of a delay as the
accumulated delays within the script.
After extensive debugging to a debug log, I can now see the script is
terminating prematurely, except for the first call. I have a trap
command to report the event on exit of the script, but script is
terminating in somewhat random places without getting trapped in
instances where it otherwise fails to complete. I can't see how this is
not a bug in Cygwin.
Cygwin Setup version 2.932 (x86_64). Updates applied.
Any suggestions welcome.
Regards,
David Koski
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