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

---

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

Attachments

This solution has no attachment