Hypersocket interface not found
Environment
Red Hat Enterprise Linux
Issue
zOS Networking performed changes* that resulted in z/Linux instances with an offline hypersocket interface(hsi0). It's no longer listed when you do ifconfig. We tried to bring it up using ifconfig, ifup and service network restart but didn't work. We've confirmed that a reboot will bring back the interface but wondering if there's a way to do it without a reboot.
* change involved varying offline paths, chipds and devices used for hypersockets between zVM guests (Linux) and zDB2. it was varied back online then the OSA devices were attached.
Resolution
# echo 1 > /sys/bus/ccwgroup/drivers/qeth/0.0.0300/online
# ifup hsi0
If this does not work then
# echo 0.0.0300,0.0.0301,0.0.0302 > /sys/bus/ccwgroup/drivers/qeth/group
# echo 1 > /sys/bus/ccwgroup/drivers/qeth/0.0.0300/online
# ifup hsi0
For reference - http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Installation_Guide/index.html#s2-s390info-qeth
Root Cause
Diagnostic Steps
This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.
Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.