Fujitsu M10-1/M10-4/M10-4S: Prtdiag Shows 1GB Less of the Total Memory After Xir Reset.

Asset ID:	1-71-1910135.1
Update Date:	2016-04-25
Keywords:

Solution Type Technical Instruction Sure

Solution 1910135.1 : Fujitsu M10-1/M10-4/M10-4S: Prtdiag Shows 1GB Less of the Total Memory After Xir Reset.

Applies to:

Fujitsu M10-1 - Version All Versions to All Versions [Release All Releases]
Fujitsu M10-4 - Version All Versions to All Versions [Release All Releases]
Fujitsu M10-4S - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Goal

Explain why prtdiag shows 1GB less of the total memory size after xir reset.

Prtdiag shows 260352 Megabytes of total memory size.

jack@m10-4s-ppar0:~$ ldm list-domain
NAME STATE FLAGS CONS VCPU MEMORY UTIL NORM UPTIME
primary active -n-c-- UART 128 260352M 0.6% 0.0% 3m
jack@m10-4s-ppar0:~$ prtdiag | head -2
System Configuration: Oracle Corporation sun4v SPARC M10-4S
Memory size: 260352 Megabytes <<-----------------
jack@m10-4s-ppar0:~$ ldm ls-devices -a mem
MEMORY
PA SIZE BOUND
0x780000000000 64G primary
0x7a0000000000 64G primary
0x7c0000000000 64G primary
0x7e0000800000 1G _sys_
0x7e0040800000 384M _sys_
0x7e0058800000 128M _sys_
0x7e0060800000 248M
0x7e0070000000 63744M primary
jack@m10-4s-ppar0:~$

Once you send an xir reset to a PPAR from the XSCF, prtdiag shows 1GB less of the total memory size.

XSCF> reset -p0 xir
PPAR-ID to reset :00
Continue? [y|n] :y
00 : Resetting

jack@m10-4s-ppar0:~$ ldm list-domain
NAME STATE FLAGS CONS VCPU MEMORY UTIL NORM UPTIME
primary active -n-c-- UART 128 253G 0.0% 0.0% 23m
jack@m10-4s-ppar0:~$
jack@m10-4s-ppar0:~$ prtdiag | head -2
System Configuration: Oracle Corporation sun4v SPARC M10-4S
Memory size: 259072 Megabytes <<----------------- Less 1280 Megabytes
jack@m10-4s-ppar0:~$ ldm ls-devices -a mem
MEMORY
PA SIZE BOUND
0x780000000000 64G primary
0x7a0000000000 64G primary
0x7c0000000000 64G primary
0x7e0000000000 1416M
0x7e0059000000 1G _sys_
0x7e0099000000 384M _sys_
0x7e00b1000000 128M _sys_
0x7e00b9000000 112M
0x7e00c0000000 61G primary
jack@m10-4s-ppar0:~$

After executing poweroff/poweron, the total memory size is back to the original size.

jack@m10-4s-ppar0:~$ ldm list-domain
NAME STATE FLAGS CONS VCPU MEMORY UTIL NORM UPTIME
primary active -n-c-- UART 128 260352M 0.0% 0.0% 5m
jack@m10-4s-ppar0:~$ prtdiag | head -2
System Configuration: Oracle Corporation sun4v SPARC M10-4S
Memory size: 260352 Megabytes <<----------------- Original total memory size
jack@m10-4s-ppar0:~$ ldm ls-devices -a mem
MEMORY
PA SIZE BOUND
0x780000000000 64G primary
0x7a0000000000 64G primary
0x7c0000000000 64G primary
0x7e0000800000 1G _sys_
0x7e0040800000 384M _sys_
0x7e0058800000 128M _sys_
0x7e0060800000 248M
0x7e0070000000 63744M primary

jack@m10-4s-ppar0:~$

Solution

Hypervisor may abort because of a hardware failure or software error. If Hypervisor aborts, Hypervisor information is saved as a dump file. This is called the Hypervisor dump (hvdump) function.

The Hypervisor dump is also collected when you send an xir reset to a PPAR, the hvdump is generated and result in about 1GB less of total memory size. This is because a memory space is used to save a Hypervisor dump and then a hvdump file (hvdump.x.gz, "x"= An integer from 0 to 7 is automatically assigned) is generated to a disk space (/var/opt/SUNWldm directory) once OS booting. So this is an expected behavior.

For more details about the hvdump settings, please refer to the Fujitsu M10/SPARC M10 Systems System Operation and Administration Guide, chapter 8.12 Collecting a Hypervisor Dump File and 10.15 Resetting a Physical Partition for reference.

Fujitsu M10/SPARC M10 Systems System Operation and Administration Guide

References

<NOTE:1611376.1> - Fujitsu M10-1/M10-4/M10-4S: Memory consumption by ldom manager and hypervisor
<BUG:19162754> - PRTDIAG SHOWS ABOUT 1GB LESS TOTAL MEMORY SIZE AFTER XIR RESET

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