Installing the CCW DASD dump tool

Install the CCW DASD dump tool on an unused DASD partition. Dumps are written to this partition.

Before you begin

You need an unused DASD partition with enough space (memory size + 10 MB) to hold the system memory. If the system memory exceeds the capacity of a single DASD partition, use the multi-volume dump tool, see Using DASD devices for multi-volume dump.

About this task

The examples assume that /dev/dasdc is the dump device and that we want to dump to the first partition /dev/dasdc1.

The steps you need to perform for installing the CCW DASD dump tool depend on your type of DASD, ECKD™ or FBA:

If you are using an ECKD-type DASD, perform all three of the following steps.
If you are using an FBA-type DASD, skip steps 1 and 2 and perform step 3 only.

Procedure

(ECKD only) Format your DASD with dasdfmt.
Use a block size of 4 KB.
For example:
```
# dasdfmt -f /dev/dasdc -b 4096
```
(ECKD only) Create a partition with fdasd.
The partition must be sufficiently large (the memory size + 10 MB).
For example:
```
# fdasd /dev/dasdc
```
Install the dump tool using the zipl command.
You can specify the dump device on the command line or use a configuration file.
Command line example:
```
# zipl -d /dev/dasdc1
```
Configuration file example:
1. Edit /etc/zipl.conf to add the following lines:
```
[dump_dasd]
dumpto=/dev/dasdc1
```
2. Issue:
```
# zipl dump_dasd
```
Note: When using an ECKD-type DASD formatted with the traditional Linux® disk layout ldl, the dump tool must be reinstalled using zipl after each dump.