IBM Support

Performance Degradation and Loss of GUI/CLI Access Due to Excessive Numbers of Socket Connections

Flash (Alert)


Users may experience host I/O performance degradation and/or loss of GUI/CLI access if an excessive number of socket connections have been established to an internal SSH process.


Browser-based GUI access or the use of a third-party network scanning tool will result in a socket being opened to an internal SSH process. In certain circumstances these sockets may be left open, despite the GUI or network scanning session being closed.

If the number of open sockets reaches in the region of 250 and upwards, it is expected that the user will begin to see performance impacts to host I/O.

Once the number of open sockets reaches 1024, no further GUI or CLI sessions may be established until this process has been reset.

This issue exists in all V6.1.0.x and V6.2.0.0-V6.2.0.3 releases.

If a customer believes that they may be experiencing the symptoms described by this flash, they are encouraged to contact IBM Support for confirmation and advice about how to restart the internal SSH process.


This issue was fixed by APAR IC79696 in the V6.2.0.4 PTF release.

Cross reference information
Segment Product Component Platform Version Edition
Storage Virtualization SAN Volume Controller 6.2 SAN Volume Controller 6.1, 6.2

Document information

More support for: IBM Storwize V7000 (2076)

Version: 6.1, 6.2

Operating system(s): IBM Storwize V7000

Reference #: S1003930

Modified date: 17 November 2011

Translate this page: