Fujitsu PRIMEQUEST 400 Series, Installation Manual, Page: 310 / 446

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CHAPTER 4 Work Required After Operating System Installation
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Kernel memory dump (recommended)
Only the kernel memory space contents are recorded. The boot volume must
have 50 megabytes to several hundred megabytes (up to the physical memory size
plus 128 megabytes) of free space. The size depends on the operating status. The
boot volume can store only one dump. If the specified save location already has a
dump file, the dump file is overwritten.
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Small memory dump
Minimal information that is helpful for identifying a problem is recorded. This
memory dump requires 64 or 128 kilobytes of free space. If this option is
specified, a file is created each time the system is unexpectedly stopped.
Table 4.7 Modes and sizes of memory dump
*1 The maximum size is shown here, but the value depends on the memory space
size.
*2 By default, an existing file is overwritten. The default setting can be changed so
that an existing file is not overwritten. However, note that no new file would be
created, unlike in a "minimum memory dump."
Notes: Select the setting mode appropriate for system operation by considering the
following:
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If the PRIMEQUEST Software Installer is executed, the mode is automatically
set to kernel memory dump. Because a kernel memory dump does not include
user mode information, the cause of the problem may not always be determined.
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Depending on the size of mounted memory, a complete memory dump takes
longer to create a dump and keeps business stopped longer accordingly. In
addition, more space is required for saving a dump file on the hard disk.
Memory dump mode Memory dump file
Complete memory dump Physical memory size + 1 MB Overwrite (*2)
Kernel memory dump Depends on the size of
memory space used during
operation of the operating
system (normally, 50
megabytes to several hundred
megabytes)
Maximum: Mounted physical
128 megabytes (*1)
Overwrite (*2)
Small memory dump 64 KB or 128 KB Creation of a new file