Asset ID:	1-77-1000927.1
Update Date:	2011-03-07
Keywords:

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Solution Type  Sun Alert Sure

Solution  1000927.1 :   Sun StorEdge T3+ Arrays May Experience Performance Degradation When the NTP Feature is Enabled  


PreviouslyPublishedAs
201242

Product
Sun StorageTek T3 Array
Sun StorageTek T3+ Array

Bug Id
<SUNBUG: 4798293>

Date of Resolved Release
22-APR-2005

Impact

Sun StorEdge T3+ Arrays with the Network Time Protocol (NTP) feature enabled may experience performance degradation. This could cause applications to run slowly, hang, or encounter a reset.

Contributing Factors

This issue can occur in the following configurations:

• Sun StorEdge T3+ without patch 112276-08

Note: This issue only occurs on Sun StorEdge T3+ Arrays with the NTP feature enabled. Use the "ntp" command from the T3+ prompt to determine if NTP is enabled:

    t3:/:<4> ntp
server     999.999.99.9 <--- sample IP address of an NTP server
poll        unicast <---- this means NTP is enabled
interval        10

Symptoms

Typical StorEdge T3+ syslog messages associated with this issue are shown below:

   Jan 12 06:50:11 psc0[1]: N: refresh -s
Jan 12 06:50:11 TZD[1]: N: Daylight saving transition happened.
Jan 12 06:50:24 TZD[1]: N: Daylight saving transition happened.
Jan 12 06:50:38 TZD[1]: N: Daylight saving transition happened.
Jan 12 06:50:51 TZD[1]: N: Daylight saving transition happened.

In addition, error messages in /var/adm/messages or on the host console may indicate I/O timeouts for a particular application.

Workaround

To work around the described issue, disable the NTP function on affected Sun StorEdge T3+ arrays with the following command from a T3+ prompt:

    t3:/:<1> ntp poll off

If synchronizing the time clock on the Sun StorEdge T3+ is required, this can be accomplished by manually running the NTP function during intervals of low system activity. NTP should be disabled once the time clock on the Sun StorEdge T3+ has been synchronized. The following command will turn NTP on:

   t3:/:<1> ntp poll unicast

The polling time interval may be set with

   t3:/:<2> ntp interval time

(where time is a value from 1 to 60 minutes; the default value is 10)

Resolution

• Sun StorEdge T3+ with patch 112276-08 or later

Modification History
Date: 22-APR-2005

• State: Resolved
• Resolution: Workaround, Patch
• Updated Contributing Factors
• Updated Resolution

References

<SUNPATCH: 112276-08>

Previously Published As
101167
Internal Comments

An alternate workaround for this issue is to install the "t3time" perl script which can be run from a host cron job during off peak hours to adust the time clock on the Sun StorEdge T3+. The "t3time" script can be downloaded from the PTS-NWS website under the "tools"section of T3/T3+: http://pts-americas.west/nws/products/T3/tools.html.

Internal Contributor/submitter
dave.bruce@sun.com

Internal Eng Business Unit Group
NWS (Network Storage)

Internal Eng Responsible Engineer
tin.nguyen@sun.com, bryan.embry@sun.com

Internal Services Knowledge Engineer
pete.stauffer@sun.com

Internal Escalation ID
542665

Internal Resolution Patches
112276-08

Internal Sun Alert Kasp Legacy ID
101167, 50270 (Sun Alert)

Internal Sun Alert & FAB Admin Info
Critical Category: Availability ==> Pervasive
Significant Change Date: 2003-01-27
Avoidance: Patch, Workaround
Responsible Manager: tejinder.singh@sun.com
Original Admin Info: 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: 50270
Synopsis: Sun StorEdge T3+ Arrays May Experience Performance Degradation When the NTP Feature is Enabled
Category: Availability
Product: Sun StorEdge T3+ Array
BugIDs: 4798293
Avoidance: Workaround, Patch
State: Resolved
Date Released: 27-Jan-2003
Date Closed: 22-Apr-2005
Date Modified: 22-Apr-2005
Escalation IDs: 542665
Pending Patches:
Resolution Patches: 112276-08
FIN:
FCO:
Date Submitted: 23-Jan-2003
Submitter: dave.bruce@sun.com
Responsible Engineer: tin.nguyen@sun.com, bryan.embry@sun.com
Responsible Manager: tejinder.singh@sun.com
CTE group: CPRE NWS US
Responsible Writer: pete.stauffer@sun.com
Distribution: Public SunSolve

Workflow History:

WF State: Issued, 22-Apr-2005, Pete Stauffer
WF Note: Re-released as resolved with resolution patch 112276-08.

WF State: Issued, 27-Jan-2003, Pete Stauffer
WF Note: Released to Contract SunSolve.

WF State: Draft, 27-Jan-2003, Pete Stauffer
WF Note: Sent to sfa-signoff.

WF State: Draft, 24-Jan-2003, Pete Stauffer
WF Note: Sent to sunalert-review.

WF State: Draft, 24-Jan-2003, Pete Stauffer
WF Note: Article created.

Exported from KMS Creator Sat May 21 08:54:59 2005 GMT, olaf.reineke@sun.com
Internal SA-FAB Eng Submission
Sun StorEdge T3+ Arrays May Experience Performance Degradation When the NTP Feature is Enabled

Product_uuid
2a6d7d50-0a18-11d6-8e0b-f0bd33b24928|Sun StorageTek T3 Array
2a714b10-0a18-11d6-86e2-d56b387d4fbf|Sun StorageTek T3+ Array

References

SUNPATCH:112276-08

Attachments

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