Format of data etc
Saving
The most likely data to be of use to others is the analyzed/aggregated data. This is kept in
/nfs/slac/g/net/pinger/pingerreports/hep/
There is a lot of data so you will need a lot of space. I suggest you use the /tmp ditrectory as intermediate storage, do one metric at a time (e.g. average_rtt), one size (e.g. 100) and one by (e.g. by-node). If this does not work send an email to unix-admin temporary requesting space in /afs/slac/public/users/cottrell (this is accessible from anonymous FTP). Note you will need space for the copied directory and for the tar's and zipped file. I requested 100Gbytes.
For 1 metric (average_rtt)
$mkdir /afs/slac/public/users/cottrell/average_rtt-100-by-node
$cp -v /nfs/slac/g/net/pinger/pingerreports/hep/average_rtt/average_rtt-
100
-by-node* /afs/slac/public/users/cottrell/average_rtt-100-by-node
#There are about 6500 files per metric. Copy takes about 20 mins per metric.
$tar -cvzf /afs/slac/public/users/cottrell /archive-average_rtt-100-by-node.tar /afs/slac/public/users/cottrell/average_rtt-100-by-node/average_rtt-100-by-node
#A metric takes about 6 minutes to tar and compress and each tar file occupies ~ 1.5GBytes.
For all metrics with 100Byte pings by node
$mkdir /afs/slac/public/users/cottrell/metrics-100-by-node
$cp -v /nfs/slac/g/net/pinger/pingerreports/hep/*/*-
100
-by-node* /afs/slac/public/users/cottrell/metrics-100-by-node
$tar -cvzf /afs/slac/public/users/cottrell /archive-average_rtt-100-by-node.tar /afs/slac/public/users/cottrell/average_rtt-100-by-node
However:
$ls /nfs/slac/g/net/pinger/pingerreports/hep/*/*-100-by-node*
/bin/ls: Argument list too long.
Exit 1
So following the guidance in http://www.linuxjournal.com/article/6060 we could try to write a script:
function large_cp () { while read line1; do cp -v directory/$line1 /afs/slac/public/users/cottrell/metrics-100-by-node done }i ls -1 directory/ | large_cp
To provide maximum flexibility we decided to write a script (pinger-tar.pl) to copy and tar the data.
The compression ratio is about 3.2.
To increase the number of files we could change the ping size from 100 to 1000 (in average_rtt-
100
-by-node* for example) and the by-node to by-site, i.e. a factor of 4.
Retrieving
See http://www-iepm.slac.stanford.edu/pinger/tools/retrievedata.html