On Jun 17, 2019, at 3:00 PM, David Zomaya <[email protected]> wrote:
Hi Network UPS Tools Support,
I’m not sure if this is a question for the “user group” or the developer group”.
The config files will be useful for -users, but I'd say the development list is
probably better for discussing potential changes.
My name is David Zomaya and I work at Tripp Lite in our technical support
department. Copied on this email are Eric Cobb from our Product Management group
& Jonathan Manzanilla tech support subject matter expert for our single phase
UPS product lines.
I recognize Eric's name from a few years ago - he emailed some detailed test
results with NUT connecting to various Tripp-Lite models. Hi, Eric!
Recently, we received a complaint about our SMART1500LCDXL dropping and
reconnecting in different Linux Operating Systems.A fter some in-house testing,
the behavior seems to be reproducible on a number of different *nix operating
systems (Windows seems fine). Here’s an example of the drops in
/var/log/messages (I’ll use CentOS 7.6 as my reference point throughout this
email):
May 29 19:25:27 localhost kernel: usb 2-2.1: new low-speed USB device number 6
using uhci_hcd
May 29 19:25:27 localhost kernel: usb 2-2.1: New USB device found,
idVendor=09ae, idProduct=2012
May 29 19:25:27 localhost kernel: usb 2-2.1: New USB device strings: Mfr=1,
Product=2, SerialNumber=0
This is a little off-topic, but I would like to point out that not including a
machine-readable serial number in the USB device descriptor makes it difficult for people
to reliably use two or more UPSes on a single *nix system. Due to some complications with
the way that USB devices are opened in libusb, there is no easy way to "open the
next unused USB device", so we recommend that people match against the serial number.
May 29 19:25:27 localhost kernel: usb 2-2.1: Product: Tripp Lite UPS
May 29 19:25:27 localhost kernel: usb 2-2.1: Manufacturer: Tripp Lite
May 29 19:25:27 localhost kernel: hid-generic 0003:09AE:2012.0004:
hiddev0,hidraw1: USB HID v1.10 Device [Tripp Lite Tripp Lite UPS ] on
usb-0000:02:02.0-2.1/input0
May 29 19:25:29 localhost upsd[6287]: UPS [TrippLiteUPS] data is no longer stale
May 29 19:25:29 localhost upsd: UPS [TrippLiteUPS] data is no longer stale
May 29 19:25:45 localhost kernel: usb 2-2.1: USB disconnect, device number 6
It would be interesting to see the debug log from usbhid-ups as well. It would give a little more
context to the kernel errors. I haven't used a physical CentOS or RedHat system in a while, so I am
not sure of the specifics needed to just stop the usbhid-ups driver, but then you can restart it
with a few "-D" flags (3 should be sufficient for this kind of problem) and "-a
TrippLiteUPS" to match this configuration. Please compress any log files (gzip preferred; zip
works).
As a result, this impacted the user’s ability use NUT software on their Linux
hosts. After some trial and error (and a lot of search engine use), I was able
to find that the following configuration changes/settings stop the drops and
stabilize performance:
1) This in the ups.conf file
pollinterval = 1
pollinterval defaults to 2, and to be honest, for most other UPSes, we suggest
that people raise the value (since many UPSes do not update their filtered
values more frequently than that anyway). Do you know how frequently the
Windows software polls the UPS? Should this be applied to other models as well,
or just protocol 2012?
[TrippLiteUPS]
driver = usbhid-ups
port = auto
desc = "SMART1500LCD"
2) The attached 62-nut-usbups.rules file at /etc/udev/rules.d/
3) The attached 42-usb-hid-pm.rules /usr/lib/udev/rules.d/
The 62-nut-usbups.rules file looks pretty standard. Do you know if the changes
to 42-usb-hd-pm.rules are needed? It seems like none of the USB devices would
have the right permissions if 62-nut-usbups.rules isn't sufficient (though this
happened in Debian once).
Below is some other information that may be relevant regarding my testing.
· I installed using the command “yum install nut.x86_64”
· Operating system version:
CentOS Linux release 7.6.1810 (Core)
· Network UPS Tools version
Network UPS Tools upsd 2.7.2
Note that NUT 2.7.4 has been out for some time now.
