Brian,
Brian Ruthven - Sun UK wrote:
Marcus Heine wrote:
Hi,
I am currently playing around with diskless Solaris (iscsi, network
booted ramdisk, etc)
and found that dumpadm allows me to configure a USB stick or an iscsi
device as a dump
device no problem, like
dumpadm -c kernel -d /dev/dsk/...
but testing this with "reboot -d" did not result in any crashdump
activity.
The x86 system just hung for about 5 seconds and then reset.
How are you concluding there was no "crashdump activity"?
To me, that sounds like it was dumping to the USB stick - 5 seconds
could be about right for a fast x86 system.
Did you check for a corresponding panic message in the
/var/adm/messages file when the system came back up?
My USB stick has a little LED that flashes when it is written to. In the
5 seconds it did not flash at all.
Also savecore when enabled (thanks for pointing that out) does not find
any crashdump when it reboots.
I just tried once more.
When I run "savecore -v -L" to snapshot and dump the live system to the
USB stick it works though.
Dumping all the pages takes about 40 seconds then and the USB drive LED
flashes as it should, but I think
this is keeping the current live kernel fully multithread and with
interrupts enabled, so is not comparable
to a real panic.
Also, should I not see a panic string on the console and even a kernel
stack trace for a couple of seconds
on the screen, before resetting?
Thanks,
--Marcus
OpenSolaris 2009.06 shipped with savecore disabled by default (see
http://defect.opensolaris.org/bz/show_bug.cgi?id=5003 - it seems it
should have been fixed for 0906 but wasn't). Check the output of
dumpadm (example below), and check that savecore is enabled. If not,
then run "dumpadm -y" to enable it.
# dumpadm
Dump content: kernel pages
Dump device: /dev/zvol/dsk/rpool/dump (dedicated)
Savecore directory: /var/crash/opensol
Savecore enabled: yes
Regards,
Brian
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