Hi there,

I am running some Raspberries, "Zero Wifi", with Raspbian (Stretch) for
getting data out of some BME280 sensors. Every 10 minutes the sensors are
queried, the data processed and sent to a (cgi) web interface to store
the values on a webserver.

For stability aspects I'm doing a reboot once per night via crontab, and,
as shown in my router's logfile, this reboot and sign in into Wifi again
takes less than one minute. So far, everything ok.

But, every few weeks, the machine doesn't return from reboot.

In the internet router's logfile I see that the machine has signed off,
but does not sign in again into wifi. It will stay offline / dead.

If you remember the discussion I started some weeks ago, see

    Subject: "Is Kingston knowingly crappy?"

then this seems to have the same cause, but Kingston SD / Micro SD cards
seem to be very fragile if stressed to hard, and they soon have
unrecoverable cells. I.e., you have to throw them away.

Higher quality Micro SD cards like "inenso" do not die so fast, but:

The machine also signs off and then it will stay offline. I have no info
if shutdown fails, or if booting up doesn't work, but, even dis-/re-
connecting power doesn't help in such a case.

The weird thing is:

If I pull the Micro SD card out of RPi, put it into a normal PC (notebook
with Linux on it), then both partitions -- boot and root -- are shown,
and even if I do not mount them, or do an fsck, then, nevertheless the
card will boot, when pulled out of the PC and placed in the RPi back again
(!).

Anyone have an idea what's going on here?

Best  regards,

Markus

--
Please reply to group only.
For private email please use http://www.dipl-ing-kessler.de/email.htm

--- SoupGate-Win32 v1.05