For Grand Falls E1 events (loss of service for a long time) huge LOG files (200-300 thousand of lines) is a very typical and complicating characteristics. Many process (SWERRs, TRAPs, INFOs, etc) run in parallel and it is very important to understand what caused what. I want to suggest some tips that can make easier analysis of such log files.

1. First of all learn ALL logs AT THE BEGINNING of the event. It is very important to understand what process began first. You should understand the meaning of EVERY log here.
2. Unix tool awk could be very useful for logs files processing. Here are some simplest examples of its using.
   1. Cutting all logs of some definite type:

                   awk '/PM189/,length < 2' inp_file > out_file
                           ^           ^
                           |           |
          Where:    Pattern in the   End condition
                  first line of log  of log (empty string)

b) Cutting all lines BEFORE lines with some pattern:

awk '/INV CLASS/{print str;next}{str=$0}' inp_file > out_file

                  ^          ^       ^      ^
           Where: |          |       |      |
                  |     Output prev  |    Save full line
               Pattern     line    Go to
                                  next line

c) Cutting all lines TWO lines BEFORE lines with some pattern:

awk '/cp 35/{print str1;next}{str1=str;str=$0}' inp_file > out_file

d) Prepare exec for site in the form: QDN dn

                                           QDN dn
                                           . . .

awk '/ DN /{print "QDN " $8}' inp_file | sort | uniq > out_file

              ^                 ^
     Where:   |                 |
              |           Field number in line

Selection pattern that contains dn

3. If you need to answer question like that:

"What dn's that appear in logs of type A appear in logs of type B too ?" (For example, how many dn's that appear in AUDT203 logs appear in logs of TPTSWER cp 35 - inter integrity lost ?)

you could use the next procedure:

1. Use 2a) for cutting all AUDT203 logs into one file and cp 35 logs into another.
2. Use 2d) for producing of sorted list of dn's from these two new files.
3. Use tool comm in the form:

comm dn_list1_file dn_list2_file > out_file

           and in the out_file you will see three columns - in the
           third one common dn's will appear.