When Survivable CDR is enabled, the server writes the CDR data to files on the hard disk instead of sending the CDR data over an IP link. The Survivable CDR feature creates two types of CDR data files: a Current CDR data file that the server uses to actively write CDR data and a set of archive files containing CDR data that the server collected earlier but has not yet been collected and processed by the CDR adjunct. The naming convention for both file types are similar. However the name of the Current CDR file is always prefixed by a C-
(for more information, see File naming conventions for Survivable CDR). The CDR Current file remains active until one of the following events happen:
The server’s system clock reaches 12:00 midnight.
The Current CDR file reaches or exceeds 20 megabytes. A 20 megabyte file may contain up to 140K CDR records depending on the CDR format used.
A filesync, a reset system 2 (cold restart), or a reset system 4 (reboot) occurs.
After one of the above events occur the following actions take place:
The Current CDR file is closed and it becomes an archive CDR file.
The file permissions change from read/write (rw) for root and read only for members of the CDR_User group to:
The C-
prefix is removed from the front of the file name
For a main server, a new Current CDR file is created
For a Survivable Remote or Survivable Core Server, a new Current CDR file is created only if the Survivable Remote or Survivable Core Server is controlling one or more gateways or port networks.
