Sun Storage 3910 Array
 

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Certain Brocade switches (listed below) that are running Fabric Operating System (FOS) version 4.x or 5.x may reboot when a "break'" sequence followed by an ascii character is issued on the switch serial port. Plugging the serial console port of the switch into a terminal server may also cause a "break" and character sequence interpreted by the switch, leading to temporary loss of connectivity to SAN devices.

This issue can occur on any hardware platforms connected to the following Brocade switch models:

• SG-XSWBRO3250 - SilkWorm 3250 switch with 8 ports with FOS 4.x/5.x
• SG-XSWBRO3850 - SilkWorm 3850 switch with 16 ports with FOS 4.x/5.x
• SG-XSWBRO3900 - SilkWorm 3900 switch with 32 ports with FOS 4.x/5.x
• SG-XSWBRO4100-16P - SilkWorm 4100 switch with 16 ports with FOS 4.x/5.x
• SG-XSWBRO4100-32P - SilkWorm 4100 switch with 32 ports with FOS 4.x/5.x
• SG-XSWBRO12000-32P - SilkWorm 12000 switch with 32 ports with FOS 4.x/5.x
• SG-XSWBRO12000-64P - SilkWorm 12000 switch with 64 ports with FOS 4.x/5.x
• SG-XSWBRO24K-32P - SilkWorm 24000 switch with 32-128 ports with FOS 4.x/5.x
• SG-XSWBRO48ZP - SilkWorm 48000 switch with 32-256 ports with FOS 5.x
• SG-XSWBRO200E-8P - SilkWorm 200E switch with 8-16 ports with FOS 5.x

Note: Brocade SilkWorm switches running FOS 2.x or 3.x are not affected by this issue.

If the described issue occurs, the switch will reboot resulting in temporary loss of connectivity to SAN devices.

Depending on the break sequence sent to the switch, the switch may automatically reboot. This should complete normally, however it is possible that the boot sequence may be interrupted by the receipt of an "escape" character on the serial port. This will result in the following interactive menu to be entered:

    Press escape within 4 seconds to enter boot interface.
1) Start system.
2) Recover password.
3) Enter command shell.
Option?

Should the above menu be entered (following "escape" key used during reboot), select option 1.

To work around the described issue, one of the following options may be used:

Option 1:

Login as root and issue the following command:

    # echo "0" > /proc/sys/kernel/sysrq

For the 12000 and 24000 switches, the workaround must be applied to both CP boards. This workaround is not persistent across reboots and will need to be reapplied if required.

Option 2:

Disconnect the serial port following the initial switch IP configuration. Use LAN/IP for subsequent configuration, monitoring and management.

There are no further updates planned for this Sun Alert document. If
you need additional assistance regarding this issue, please contact Sun
Services.


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The Silkworm switches on FabOS 4.x/5.x run the Linux operating system. An optional part of the Linux kernel is the "CONFIG_MAGIC_SYSRQ" feature which enables a diagnostic facility. When the "break" character sequence that matches one of the "CONFIG_MAGIC_SYSRQ" definitions is received by the switch, the switch will execute that function.

Other operating systems have similar concepts (Solaris Stop-A) which can normally be disabled either by HW or SW/configuration.

See the appropriate bug ref for more information.

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