[linux-lvm] problem with lvcreate and redirection

Lentes, Bernd bernd.lentes at helmholtz-muenchen.de
Sat Feb 20 16:50:01 UTC 2016

>>> Unfortunately you can't do that if you log to the SAME volume you are
>>> suspending - i.e. you run your command from your root volume
>>> which is also suspended.
>>> We could likely 'buffer' the output while in suspend mode,
>>> and throw out the output later - but as this is seen as 'debug' help it's
>>> assume user takes care and user place for logging which doesn't block.
>>> So if you want to see logs - use something tmpfs location for it.
>>> Regards
>>> Zdenek
>> Hi Zdenek,
>> thanks for your answer. I redirected the output already to another partition,
>> but system still stopped. Maybe because the partition is on the same disk as
>> the lv ? Whole disk is suspended ? It's not possible to suspend just a
>> partition ? I will try with tmpfs or something else.
>> But does that mean that redirection is generally not possible when suspending a
>> lv ? Or just in my case because i invoke lvcreate ? What is about other
>> programs having redirections during the suspend ? And why does it work when i
>> just rediredt stdout ? When i redirect stdout and stderr system stops.
> Your 'partition' layout isn't clear - but anyway - debugging command when you
> run it from a partition you try to suspend is 'tricky'.
> Suspend basically stops any read/write operation from suspended device.
> So you just need to be sure there is nothing on logging path which might be
> blocked.
> So is your command blocked when you log into ramdisk ?
> Are you using some recent version of lvm2 ?
> Zdenek

i have two partitions on the disk: One for /boot and one as a lv for /.
I will try to redirect to a ramdisk and inform you.
LVM is lvm2-2.02.98-0.37.2

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