APAR status
Closed as program error.
Error description
When the DataPower DNS setting is configured to use First Alive, an outstanding DNS resolution (query) might cause DataPower to suspend the opening of all outgoing connections (both local/loopback and remote) until the DNS resolution completes. This issue is observed if the DNS server is unresponsive or responds with an error. Also, this might cause latency to increase for transactions.
Local fix
There are three possible workarounds to this issue: 1. Use Round Robin for the DataPower DNS Load Balancing Algorithm. 2. Ensure the DNS servers are responsive to all DNS queries (A and AAAA). 3. Lower the timeout value used for DNS Load Balancing Algorithm "first-alive".
Problem summary
Affected are customers with problematic/slow DNS access. When the DataPower DNS setting is configured to use First Alive, ongoing DNS queries could suspend the opening of all outgoing DataPower connections until finished.
Problem conclusion
The fix is available on 4.0.1.17, 4.0.2.13, 5.0.0.8 and 6.0.0.0. For a list of the latest fix packs available, please see: http://www-01.ibm.com/support/docview.wss?uid=swg21237631
Temporary fix
There are three possible workarounds to this issue: 1. Use Round Robin for the DataPower DNS Load Balancing Algorithm. 2. Ensure the DNS servers are responsive to all DNS queries (A and AAAA). 3. Lower the timeout value used for DNS Load Balancing Algorithm "first-alive".
Comments
APAR Information
APAR number
IC90458
Reported component name
DATAPOWER BLAD
Reported component ID
DPBLADE01
Reported release
382
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-02-25
Closed date
2013-04-23
Last modified date
2013-06-29
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
DATAPOWER BLAD
Fixed component ID
DPBLADE01
Applicable component levels
R401 PSN
UP
R402 PSN
UP
R500 PSN
UP
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Document Information
Modified date:
29 June 2013