Re: [foxboro] BackUp

If you have a mirrored system, you can backup the mirrored disk in
multi-user mode with no problems at all.
Make a copy of the foxboro supplied /usr/local/dump.51 and call it something
like /usr/local/dump.mirror.
Modify this script to point to the second (mirrored) hard disk.

Unmirror the system disk with /usr/local/dft UNMIRROR_SYS
Run the newly created script  /usr/local/dump.mirror
Once finished re-mirror the system with /usr/local/dft MIRROR_SYS
You can check the progress of the mirroring with /usr/local/dft SHOW_STATUS

The advantage of this is that there is no system down time at all.
All our mirrored systems are done like this and for auditing purposes we
restored a tape onto a spare system to prove that this way of backing up is
good way of backing up.

Regards,
Frits Schouten.
BHP-NZSteel

-----Original Message-----
From: Ajay_Tathgir@xxxxxxx [mailto:Ajay_Tathgir@xxxxxxx]
Sent: Friday, 16 August 2002 19:15
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] BackUp




Thanks. Yeah the idea was to reduce the time AW remains in single user.

And as i said, i was just wondering. And now after listening to Warren &
you I have stopped wondering also.


Regards




Ajay Tathgir
Reliance Industries Limited
Mumbai - India




"Sieling, Marcel" <msieling@xxxxxxxxxxx>@freelists.org on 08/15/2002
06:20:56 PM

Please respond to foxboro@xxxxxxxxxxxxx

Sent by:    foxboro-bounce@xxxxxxxxxxxxx


To:    "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
cc:
Subject:    Re: [foxboro] BackUp



Hi,

>I was just wondering what possible problems=20
>could occur if I took a day 0
>dump in multi-user mode.

A lot. Simply don't do it.

If you want to reduce downtime while doing=20
dd backups or dumps use a second harddisk=20
for this, boot in single user mode, dump the live=20
harddisk to the second harddisk (which usually=20
only takes around 20 minutes for not tooo big=20
harddisks on standard style C or E 51 machines),=20
reboot in multi user mode again and then=20
backup this second harddisk to whatever=20
(slow) medium you want.

Best regards -

Marcel Sieling
Systems Technologies

Invensys Systems GmbH
Heerdter Lohweg 53 - 55
40549 Duesseldorf
Germany
Tel.:  +49 (0)30-267-15542
Tel.:  +49 (0)211 5966-171
Fax:  +49-(0)172-50-2673077
Mobile:  +49-(0)172-2673077
Email: <mailto:msieling@xxxxxxxxxxx>=20
Homepage: <http://www.invensys-process-systems.de>=20
Visit my private (german) homepage: <http://www.powerslider.de>=20

Wir m=F6chten Sie auf unsere Veranstaltungen hinweisen:
Invensys Showcase - Worldwide User Conference & Expo
8. - 12. September, Orlando, Florida USA=20
http://www.invensysshowcase.com


-----Urspr=FCngliche Nachricht-----
Von: Ajay_Tathgir@xxxxxxx [mailto:Ajay_Tathgir@xxxxxxx]
Gesendet: Dienstag, 13. August 2002 12:06
An: foxboro@xxxxxxxxxxxxx
Betreff: [foxboro] BackUp




I was just wondering what possible problems could occur if I took a day =
0
dump in multi-user mode.

Regards


Ajay Tathgir
Reliance Industries Limited
Mumbai - India


=20
=20
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