Fujitsu PRIMEQUEST 400 Series, Installation Manual, Page: 296 / 446

4-110 C122-E001-10EN
CHAPTER 4 Work Required After Operating System Installation
When re-creating a dump device with regard to a dump device extension or disk
failure, re-initialize the dump device. For details on how to initialize dump devices,
see Section 4.9.2, "diskdump initial setting."
Dump device size
Use fdisk or parted to allocate a dump device area (area type: Linux(83)).
The size of one dump device area is as follows.
* When Extended Mirror Mode is used, the usable memory size is half the
size of memory actually installed. Therefore, when Extended Mirror
Mode is used, the installed memory size shown above is half the size of
memory actually installed.
No dump device can be shared with a file system or swap partition.
To determine the exact size of a dump device so as to reduce disk usage when using
diskdump, perform the following operation.
The total block size is displayed in memory pages. In this example, an area of
"262,042 x 16,384" bytes is required for the dump device.
Redundant dump device
To guarantee that a dump can be collected on an alternate dump device in the event of
an abnormality in the normally used dump device, add at least one dump device.
Each additional dump device should be physically different from the existing device.
Usable devices
Usable devices are as follows. Create them on a non-duplicated disk not managed on
PRIMECLUSTER GDS.
Dump device size = installed memory size* + 512 MB
# cat /proc/diskdump
# sample_rate: 8
# block_order: 2
# fallback_on_err: 1
# allow_risky_dumps: 1
# total_blocks: 262042
# getconf PAGESIZE
16384