Sun Microsystems, Inc.  Sun System Handbook - ISO 3.4 June 2011 Internal/Partner Edition
   Home | Current Systems | Former STK Products | EOL Systems | Components | General Info | Search | Feedback

Asset ID: 1-77-1000860.1
Update Date:2011-02-22
Keywords:

Solution Type  Sun Alert Sure

Solution  1000860.1 :   Certain SAN Switches May Reboot Following "break" Sequences Received on the Serial Port  


Related Items
  • Sun Storage 3910 Array
  •  
Related Categories
  • GCS>Sun Microsystems>Sun Alert>Criteria Category>Availability
  •  
  • GCS>Sun Microsystems>Sun Alert>Release Phase>Resolved
  •  

PreviouslyPublishedAs
201141


Product
Sun StorageTek 3900 Series

Bug Id
<SUNBUG: 6238769>

Date of Workaround Release
16-MAY-2005

Date of Resolved Release
31-Mar-2008

Certain Brocade switches (listed below) that are running Fabric Operating System (FOS) version 4.x or 5.x may reboot ... see below for details:

1. Impact

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.


2. Contributing Factors

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.


3. Symptoms

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


4. Workaround

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.


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


This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU
ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT
OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This
Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.


Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.


Modification History
31-Mar-2008: no further updates. Resolved.
25-MAY-2006: Updated Contributing Factors section



Previously Published As
101685
Internal Comments


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.


Internal Contributor/submitter
brian.austin@sun.com

Internal Eng Business Unit Group
NWS (Network Storage)

Internal Eng Responsible Engineer
brian.austin@sun.com

Internal Services Knowledge Engineer
jeff.folla@sun.com

Internal Escalation ID
1-7189660

Internal Sun Alert Kasp Legacy ID
101685, 57778 (Sun Alert)

Internal Sun Alert & FAB Admin Info
Critical Category: Availability ==> Pervasive
Significant Change Date: 2005-05-16
Avoidance: Workaround
Responsible Manager: Karl-Heinz.Wegener@Sun.COM
Original Admin Info: [WF 01-Nov-2005, Jeff Folla: Changed audience from contract to free.]

This document has been imported from KMS Creator and may need adjustment before re-publishing.

This imported document has been reviewed/adjusted by:
Review Name:
Review Date:

Original KMS Creator attributes below:

--- PLEASE DO NOT MAKE ANY CHANGES BELOW THIS LINE! ---

Sun Alert ID: 57778
Synopsis: Certain SAN Switches May Reboot Following "break" Sequences Received on the Serial Port
Category: Availability
Product: Brocade SilkWorm Switches 3250/3850/3900/4100/12000/24000
BugIDs: 6238769
Avoidance: Workaround
State: Committed
Date Released: 16-May-2005
Date Closed:
Date Modified:
Escalation IDs: 1-718966
Pending Patches:
Resolution Patches:
FIN:
FCO:
Date Submitted: 19-Apr-2005
Submitter: brian.austin@sun.com
Responsible Engineer: brian.austin@sun.com
Responsible Manager: Karl-Heinz.Wegener@Sun.COM
CTE group: NWS
Responsible Writer: jeff.folla@sun.com
Distribution: Contract SunSolve

Workflow History:

WF State: Issued, 16-May-2005, Jeff Folla
WF Note: Received Brocade approval. Sending for release.

WF State: Draft, 10-May-2005, Jeff Folla
WF Note: 5/10: Sent follow-up e-mail to Jerry requesting
status on brocades approval.

WF State: Draft, 10-May-2005, Jeff Folla
WF Note: 5/3 : Jerry Chen who reviews the Brocade Sun Alerts informed me that Brocade
had some questions they wanted to ask the Responsible Engineer.
He will let me know once this is approved by Brocade.

WF State: Draft, 03-May-2005, Jeff Folla
WF Note: Awaiting Brocade approval

WF State: Draft, 29-Apr-2005, Jeff Folla
WF Note: Sent for brocade approval

WF State: Draft, 29-Apr-2005, Jeff Folla
WF Note: Sent for review on 4/28

WF State: Draft, 27-Apr-2005, Jeff Folla
WF Note: Sent to submitter for review.

WF State: Draft, 26-Apr-2005, Jeff Folla
WF Note: Article created.

Exported from KMS Creator Sat May 21 09:18:09 2005 GMT, olaf.reineke@sun.com
Product_uuid
04ccc2c2-16a1-11d7-9f9a-f83fdd2e2f1b|Sun StorageTek 3900 Series

Attachments
This solution has no attachment
  Copyright © 2011 Sun Microsystems, Inc.  All rights reserved.
 Feedback