Wed Aug 15 10:32:57 PDT 2012

There is a change to controller.c which will require a new patch to the kernel to expose
a new function:

-rw-r--r-- 1 controls controls 6112 Aug 15 10:35 linux-3.0-cs.patch
-rw-r--r-- 1 controls controls 6198 Aug 15 10:35 linux-2.6.34.1-cs.patch

Please update your kernel or models would not load.

Mon Jul 30 16:11:19 PDT 2012

As of r2996 there is a change to the Epics record/device initialization code.
In order for the new code to work correctly there is a new requirement to define
an environment variable EPICS_DB_INCLUDE_PATH to point to $EPICS_BASE/dbd directory,
for instance:

export EPICS_DB_INCLUDE_PATH=/opt/rtapps/epics/base/dbd

If this is not set in the execution environment, then the Epics process would not start.

Wed May 30 15:19:34 PDT 2012

IMPORTANT, installing new daqd and nds will require moving raw minute trend data
into the subdirectories. The new daqd frame writer will save raw minute trend files not all
into the same directory (/frames/trend/minute_raw) but instead the CRC8 is calculated
on the file name, a subdirectory is created using the calculated CRC8 hex number (0 through ff)
and then the file is created/appended in that subdirectory.

For example, when before we had 

/frames/trend/minute_raw/X2:FEC-18_DAC_OVERFLOW_0_4

from now on it will be kept here:

/frames/trend/minute_raw/0/X2:FEC-18_DAC_OVERFLOW_0_4

where "0" is the subdirectory and its name is arrived at by calculating the CRC8 sum
on string "X2:FEC-18_DAC_OVERFLOW_0_4". The reason this is implemented is that we
need to be able to avoid keeping all the files in the same directory, where "ls"
command would takes a few seconds to execute: the more files are n the same directory
the slower ls will execute. So we would like to spread the files 
evenly among the 255 subdirectories and using the CRC8 on the file names creates the uniform
file distribution.

There are two programs used to move the files into the subdirectories. crc8 program,
which calculates the CRC8 checksum, needs to be compiled as follows:

./configure
make rcv
cd build/rcv
make crc8
sudo cp crc8 /usr/local/bin

There is a Perl script which is used to print the move commands out:

cd src/daqd/util
sudo cp mv_trend.pl /usr/local/bin

Once these two commands are installed in /usr/local/bin they can be used as follows,
assuming the raw minute trend files are kept in /frames/trend/minute_raw (check frame writer daqdrc file):

cd /frames/trend/minute_raw
/usr/local/bin/mv_trend.pl

Examine the output of mv_trend.pl script and if it looks good to you, you can rerun it and pipe
the output into bash in order to execute the move commands:

/usr/local/bin/mv_trend.pl | bash

Once this is done, the contents of /frames/trend/minute_raw should look roughly as follows:

ls@x2daqfw /opt/rtcds/rtscore/alex/advLigoRTS $ ls /frames/trend/minute_raw/
0   17  2   28  31  3a  43  4d  55  5e  66  6f  77  8   88  90  99  a1  ab  b3  bc  c4  cd  d5  de  e7  f   f8
1   18  20  29  32  3b  44  4e  56  5f  67  7   78  80  89  91  9a  a2  ac  b4  bd  c5  ce  d6  df  e8  f0  f9
10  19  21  2a  33  3c  45  4f  57  6   68  70  79  81  8a  92  9b  a3  ad  b5  be  c6  cf  d7  e   e9  f1  fa
11  1a  22  2b  34  3d  46  5   58  60  69  71  7a  82  8b  93  9c  a4  ae  b6  bf  c7  d   d8  e0  ea  f2  fb
12  1b  23  2c  35  3f  47  50  59  61  6a  72  7b  83  8c  94  9d  a5  af  b7  c   c8  d0  d9  e1  eb  f3  fc
13  1c  24  2d  36  4   48  51  5a  62  6b  73  7c  84  8d  95  9e  a6  b   b8  c0  c9  d1  da  e2  ec  f4  fd
14  1d  25  2e  37  40  49  52  5b  63  6c  74  7d  85  8e  96  9f  a7  b0  b9  c1  ca  d2  db  e4  ed  f5  fe
15  1e  26  3   38  41  4a  53  5c  64  6d  75  7e  86  8f  97  a   a8  b1  ba  c2  cb  d3  dc  e5  ee  f6  ff
16  1f  27  30  39  42  4c  54  5d  65  6e  76  7f  87  9   98  a0  aa  b2  bb  c3  cc  d4  dd  e6  ef  f7 

Alex