When the Palo Alto partition is full depending on which partition is full differen issues may happen. The Palo Alto versions like 9.1.x and newer have much less issues with disk space like the 8.1 version, so an upgrade to newer version may help in many cases.
1. Generally I have seen issues becase of full disk where the HA communicaton is impacted, the commit operation fails, the GUI is not responsible and also the log correlation process is down as seen in the masterd log file in the managfment plane (usually this happens because of the log partition panlogs being full ). After cleaning the disk space use "show system software status" / "show system resources" (https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-cli-quick-start/cli-cheat-sheets/cli-cheat-sheet...) to see if the process is still down and if needed restart it with "debug software restart process <name of the process>"
2. If the pancfg partition is full on Palo Alto firewalls or Panorama you will simply not be able to install new software versions of the panos or dynamic updates. In rare cases the GUI can be impacted.
3. An issue where the root partition is full you can only delete core files or system or process debug logs but if the issue persists then open a TAC case as they can access the Linux that Palo Alto uses as a core operational system and clean things from there.
4. In some rare cases a partition like the /dev/shm can be full and a reboot of the firewall could be needed. If the issue is still there the ultimate solution for non hardware palo alto issues is saving the config to external storage then factory default reset of the firewall and again importing the the config(the TAC does this many times).
Because /dev/shm is used for temporary memory storage do you see any other partitions being full?
Maybe also check if your hard disk is ok?
I did not see any known bugs for /dev/shm for your version but maybe 10.x is too heavy for your device because of the all new features like ML machine learning etc. If you are using hardware appliance did you check if this is a supported version by device? If it is virtual edition do you see any system logs that may indicate that more hard this is needed by the virtual edition similar to PA-VM 4GB Root Partition 100 Percent Full. - Knowledge Base - Palo Alto Networks ?
It is VM-300
I checked the device on auto assistant tool and it throws the following warming
> show system disk-space Filesystem Size Used Avail Use% Mounted on /dev/root 7.0G 4.3G 2.4G 65% / none 7.7G 76K 7.7G 1% /dev /dev/nvme0n1p5 16G 4.7G 11G 32% /opt/pancfg /dev/nvme0n1p6 7.9G 1.9G 5.7G 25% /opt/panrepo tmpfs 4.8G 4.7G 179M 97% /dev/shm cgroup_root 7.7G 0 7.7G 0% /cgroup /dev/nvme0n1p8 21G 13G 7.3G 64% /opt/panlogs tmpfs 12M 0 12M 0% /opt/pancfg/mgmt/ssl/private
Rest of the disk space looks alright
Another thing I noticed the swap is zero used and free, is this normal?
What would be your recommendation on this? Can this be ignored as we are receiving no issues from it yet.
I suggest checking with the support just in case (it could normal thing in the new versions but better they to confirm this) as you seem not the only one with such issues with the new 10.6:
You also may check for memory alarms in the systems log or if there is a process with memory leakage. Also 10.0.7 is out so better test if upgrading to it if there is the same issue:
The SWAP being 0 means that there is no disk space that can be used for memory extension if needed, so this is reverse to the /dev/shm and it could be because of /dev/shm being full there is less memory available and the SWAP gets to overused because of this. With most linux systems /dev/shm only uses real memory and if it gets full the SWAP is not used to extend /dev/shm but with Palo Alto and the relation between them only the TAC may tell this.
If the support tells you this is a bug or normal behavior, please share it with us.
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