Table 11.2 Devices That Can Be Used As A Dump Device - Fujitsu PRIMEQUEST 480 System Design Manual

CHAPTER 11 Considerations for Maintenance
The capacity of the dump device needs to be expanded according to the amount of
memory installed. Therefore, if the user plans to expand the amount of installed
memory, estimate the size of the dump device based on the amount of installed
memory after expansion.
When the amount of installed memory is large, the partial dump function or
compression function can be used to reduce the disk space requirements for the dump
function. The partial dump function can collect data from only the areas used for
kernel control. Although the function can reduce the disk space requirements, it may
take a little more time for troubleshooting upon the occurrence of a kernel error or
system failure.
A dump device can be allocated either on an internal disk or on an external disk.
[Table 11.2 Devices that can be used as a dump
used as a dump device. Allocate a dump device on a non-duplicated disk.
No.
1 Internal disk
2 External disk
As the capacity of internal disks is limited, the user may be unable to construct a
system using only internal disks. In such a case, prepare a dump device on an external
disk. Note that a dump device prepared on an external disk cannot be shared by
multiple clusters.
Area used to save dump data
When the system is restarted, the dump information that has been collected by
diskdump on a dump device is saved after it is automatically converted to a format
that a dump tool can reference. Therefore, an area with the size indicated below must
be created for each type of dump information to be saved.
If an error occurs, diskdump and sadump may simultaneously collect two types of
dump information. This means that at least two types of dump information would be
saved. The dump saving areas must be in /var/crash.
Area size required per saved dump = Amount of memory installed + 1 GB
When creating a dump saving area, such as /var/crash, as a dedicated disk partition,
estimate the area size and increase the estimated value by 10% in consideration of the
file system management area.
11-2

Table 11.2 Devices that can be used as a dump device

Type
LSILogic SCSI driver
Emulex FC driver
device] lists the devices that can be
Driver
Disk not managed by
PRIMECLUSTER GDS
Remarks
C122-B001-02EN