FCoE or iSCSI can get I/O errors when net.ipv4.ip_forward sysctl is enabled

Solution In Progress - Updated -

Issue

  • This is a physical machine that is connected to a SAN. Whenever the server is rebooted, I/O errors are displayed in the console and logs.
Sep 25 15:00:30  kernel: [   85.677399] sd X:0:0:15: rejecting I/O to offline device
Sep 25 15:00:30  kernel: [   85.677463] sd X:0:0:16: rejecting I/O to offline device
Sep 25 15:00:30  kernel: [   85.677516] sd X:0:0:17: rejecting I/O to offline device
Sep 25 15:00:30  kernel: [   85.677569] sd X:0:0:18: rejecting I/O to offline device
Sep 25 15:00:30  kernel: [   85.677618] sd X:0:0:19: rejecting I/O to offline device
Sep 25 15:00:30  kernel: [   85.677642] sd X:0:0:20: rejecting I/O to offline device
Sep 25 15:00:30  kernel: [   85.677666] sd X:0:0:21: rejecting I/O to offline device
Sep 25 15:00:30  kernel: [   85.677689] sd X:0:0:22: rejecting I/O to offline device
  • Seen while IP forwarding is being enabled, either manually or by some user space daemon:
# sysctl -w net.ipv4.ip_forward=1

Environment

  • Red Hat Enterprise Linux 7
    • kernel-3.10.0-862.11.6.el7
  • KVM/RHEV
    • libvirt
  • bnx2x driver

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.