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Snapdrive for Unix

LUN discovery fails due to iSCSI daemon limitation

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SnapDrive for UNIX commands fail to discover the LUNs after continuous multiple iterations.

You may see the following error message.

0000-001 Admin error: iscsi transport protocol has dropped sessions in the host. Please ensure the connection and the service in the storage system.

This happens because of the iSCSI daemon limitation in the following hosts:

  • Red Hat Enterprise Linux 4.0

  • Oracle Enterprise Linux 4.0

Workaround

Before modifying the following system parameters, contact the OS vendor.

  1. Add the fs.file-max parameter to the /etc/sysctl.conf file.

    The following is an example in the command-line.

    # sysctl -w fs.file-max=65536
    Note We recommend to set the parameter value to 65536, but you can also set the value depending on the applications on your host.

  2. Assign 65536 to the fs.file-max parameter.

  3. Update the default shell start-up file for the root user's UNIX account.

    • For the Bourne, Bash, or Korn shell, add the following lines to the /etc/profile file by running the following command:

      cat >> /etc/profile <<EOF
if [ \$USER = "root" ]; then
if [ \$SHELL = "/bin/ksh" ]; then
ulimit -p 16384
ulimit -n 65536
else
ulimit -u 16384 -n 65536
fi
umask 022
fi
EOF

    • For the C shell (csh or tcsh), add the following lines to the /etc/csh.login file by running the following command:

      cat >> /etc/csh.login <<EOF
if ( \$USER == "root" ) then
limit maxproc 16384
limit descriptors 65536
endif
EOF

  4. Add the following parameters to the /etc/security/limits.conf file by running the following command:

    root soft nofile 65536
root hard nofile 65536

  5. Activate all the kernel parameters for the system by executing the following command: sysctl -p