The time it takes to access a xrootd file is monitored by frequently reading a file with xrdcp and using the debug output to extract the time it tooks for the different steps (e.g.: connect to redirector, connection to data server, open the file).
There are three different files on each of the data server:
file name |
comment |
---|---|
/glast/admin/mon_all.tst |
This file is the same on each server |
/glast/admin/mon_srv.tst |
The filename is the same on each server but the content is different |
/glast/admin/mon_<serverName>.tst |
unique file on each server. <serverName> is the host name of the server, e.g.: mon_wain020.tst |