Seagate ST150176LC Instrukcja Użytkownika Pobierz pdf (Strona 17)

epic4 Configuration and Administration Guide

230-------------------------------------------------------------------

230-

230 User accesspi logged in. Access restrictions apply.

Remote system type is UNIX.

Using binary mode to transfer files.

ftp> cd odf

250 CWD command successful.

ftp> prompt

Interactive mode off.

ftp> mget *.gz

Once all the files have been downloaded, you can disconnect from the FTP server and unpack

with obs_unpack as before. This time however, you need to ensure that the –x switch is not

used, so that all the data (which we almost certainly don’t have scientific rights to) ends up

belonging to the epic group.

> obs_unpack –V *.gz

The full URL for orbit-per-week data can be summarised as

ftp://accesspi:accesspi02@xmm.vilspa.esa.es/odf/

Housekeeping (SPEVAL) data

This task again involves retrieving files from the Vilspa XMM FTP server, but it’s mostly

automated.

A Perl script called speval-get, located in /home/ljg/scripts/speval-get is run as a cron

job by root every Monday, Wednesday and Friday at 19:00. It connects to xmm.vilspa.esa.es

anonymously and downloads all MOS, PN and RM SPEVAL files. They are downloaded into the

temporary directory /tmp/SPEVAL before being gunzipped and placed into their proper

locations within /xmm/archive/flight/hk.

When Vilspa first started producing SPEVAL files, they were hideously bloated with redundant

whitespace. I wrote a simple tool called speval-crush which removes this (speval-crush can

be found in /home/ljg/scripts/). It’s not really necessary to bother with speval-crush

anymore, but I periodically run all the SPEVAL files through it anyway.

SPEVAL files are stored in beneath /xmm/archive/flight/hk in directories named after the

instruments they relate to: m1, m2, pn and rm. Once downloaded from Vilspa, they have a

filename extension of .dat. If run through speval-crush, they get an additional filename

extension of .red (short for reduced).

The full URL for SPEVAL data can be summarised as ftp://xmm.vilspa.esa.es/pub/speval/

XMM Current Calibration Files (CCF)

These files are also downloaded by FTP from xmm.vilspa.esa.es. Details of the CCFs can be

found at http://xmm.vilspa.esa.es/external/xmm_sw_cal/calib/

Because the CCF archive at Vilspa contains all CCFs, a different mechanism is used to keep our

copies up to date. Our CCF files are stored in /usr/local/xmm_ccf (this isn’t really the best

place for them – they ought to go into /xmm/archive/flight/ccf or somewhere similar with

the rest of our data).

CCF files are kept up to date using an application called mirror, available from

http://sunsite.org.uk/packages/mirror/

. The software is installed in

/home/ljg/scripts/mirror, and it is configured by editing the files mirror.defaults and

xmm-public-ccf.

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