saposcol - Failed to open dynamic memory driver, error - No such device or address

Problem

Failed to open dynamic memory driver, error: No such device or address.
Error: hpvmdaemon: hpvm_inguest_dynmem_get_driver_stats() failed.
Invalid ahpvmDaemonBin: Error on fread system call B: No such file or directory
rgument, dynmem pointer NULL.
19:53:52 24.05.2016   ERROR: pfhpuxvirt.c 235: HPVMGuestLib_UpdateInfo(): return code 6

Solution

1. Install latest vmGuestLib patch:

PHSS_43650            HPVM B.06.20 vmGuestLib PATCH

2. Check/recreate memory device driver file:

# ll /dev/hpvmdynmem
crw-r--r--   1 root       sys        145 0x000000 May 15  2015 /dev/hpvmdynmem

# lsdev | grep -E -e 'hpvmdynmem|145'
      144          -1         hpvmdynmem      pseudo
      145          -1         fcoc_fcp        fcp

The major number of the current device file is wrong (145 instead 144)

Querying the memory driver will not work:

# cat < /dev/hpvmdynmem
sh: /dev/hpvmdynmem: Cannot find or open the file.

So we recreate the device file with the right major number:

# rm /dev/hpvmdynmem
# mknod /dev/hpvmdynmem c 144 0
# ll /dev/hpvmdynmem           
crw-r--r--   1 root       sys        144 0x000000 May 25 11:42 /dev/hpvmdynmem

Now querying the memory driver works again:

# cat </dev/hpvmdynmem        

mode         =          2
type         =          4
physmem      =    1833216 pages   7161 Mbytes
current size =    1833216 pages   7161 Mbytes
target size  =    1833216 pages   7161 Mbytes
default size =    1833216 pages   7161 Mbytes
freemem      =      99775 pages    389 Mbytes
available    =     893611 pages   3490 Mbytes
chunk size   =      16384 pages  65536 Kbytes
ram_dyn_min  =          0 pages      0 Mbytes
ram_dyn_max  =    1833216 pages   7161 Mbytes
ram_dyn_type =          2
host error   =          0
pressure     =         80

malloc usage =       8192 bytes      0 Mbytes
balloon size =          0 pages      0 Mbytes
pending size =          0 pages      0 Mbytes
commit size  =          0 pages      0 Mbytes
sent size    =          0 pages      0 Mbytes
pending op   =          0

retry count  =        120

See also

https://wiki.scn.sap.com/wiki/display/Basis/Hanging,+zombie,+defunct+SAPOSCOL+process+on+HP-UX