Setting devices online or offline

7.1 LPAR mode z/VM guest KVM guest

Use the chzcrypt command to set cryptographic devices and AP queues online or offline.

Before you begin

A cryptographic device must be configured for the LPAR before you can set the device or any associated AP queues online in Linux®, see Setting the LPAR configuration status.

Procedure

Preferably, use the chzcrypt command with the -e option to set cryptographic devices and AP queues online, or use the -d option to set them offline.
Examples:
- To set cryptographic devices (in decimal notation) 0, 1, 4, 5, and 12 online issue:
```
# chzcrypt -e 0x00 0x01 0x04 0x05 0x0C
```
- To set all available cryptographic devices and their associated AP queues offline issue:
```
# chzcrypt -d -a
```
Alternatively, write 1 to the online sysfs attribute of a cryptographic device to set the device online, or write 0 to set the device offline.
Examples:
- To set a cryptographic device with adapter ID 0x3e online issue:
```
# echo 1 > /sys/bus/ap/devices/card3e/online
```
- To set a cryptographic device with adapter ID 0x3e offline issue:
```
# echo 0 > /sys/bus/ap/devices/card3e/online
```
- To check the online status of the cryptographic device with adapter ID 0x3e issue:
```
# cat /sys/bus/ap/devices/card3e/online
```
  The value is 1 if the device is online or 0 otherwise.