Seagate ST150176LC User Manual download pdf (Page 18)

epic4 Configuration and Administration Guide

A cron job is run by root every Monday at 21:00. It simply executes mirror with the arguments

-pxmm-public-ccf mirror.defaults.

mirror only downloads those files that aren’t already present on epic4. It maintains its own

log of which files it has already retrieved in /usr/local/xmmsas_ccf/.mirror.

Backups

Backups are a problem on epic4 as there is over 1TB of online storage available, and only a

single DDS4 tape drive, with a maximum capacity of 40GB, for backups.

Most of our data is static, or changes rarely. This is backed up irregularly onto as many tapes

as necessary. The contents of /xmm/archive/ground doesn’t change, for example, so a single

tape holds the entire contents of that disc.

Labelled tapes are provided. Whenever a backup is performed, the date should be recorded on

the tape’s box insert.

/xmm/archive/flight is backed up onto a number of tapes as so:

Contents Last backed-up

0014-0099 6 Oct 2003

0100-0199 6 Oct 2003

0200-0399 7 Oct 2003

0400-0499 7 Oct 2003

0500-0599 2 Oct 2003

0600-0699 8 Oct 2003

hk (SPEVAL) 13 Oct 2003

Because these don’t all sit in their own partition, the data can’t be archived to tape with the

dump command. Instead they are backed up with the following commands for the orbital data:

> cd /

> find xmm/archive/flight/orbits/

pattern

–print | cpio –oav –C 512 > /dev/rst0

pattern

is a simple regex and is one of

• 00* for orbits 0014-0099

• 01* for orbits 0100-0199

• 0[23]* for orbits 0200-0399

• 04* for orbits 0400-0499

• 05* for orbits 0500-0599

• 06* for orbits 0600-0699

(orbits 200-399 happen to fit onto a single DDS4 tape).

The SPEVAL housekeeping data is copied to tape with a similar command:

> cd /

> find xmm/archive/flight/hk –print | cpio –oav –C 512 > /dev/rst0

In all cases, data can be restored with the cpio command:

> cd /

> cpio –idmv –H newc –C 512 < /dev/rst0

and the contents of a tape examined with:

1 2 ... 13 14 15 16 17 18 19

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