[SunHELP] 2-disk mirroring

[David Strom]

If you have ONLY two disks, you can include this line in your 
/etc/system file:
	set md:mirrored_root_flag=1

Refer to the Sun Blueprints online article on mirroring, etc.:
Sun Blueprints articles:  http://www.sun.com/blueprints/browsesubject.html

Specific article: http://www.sun.com/blueprints/1002/817-0407-10.pdf

HTH.
--
David Strom


Original message:

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Message: 10
Date: Fri, 15 Oct 2004 10:47:10 +0200
From: Michael Karl <mk at lexcom-net.de>
Subject: Re: [SunHELP] SDS/Sol8-9 question: replicas on a mirror ???
To: <sunhelp at sunhelp.org>
Message-ID: <BD955B2D.16423%mk at lexcom-net.de>
Content-Type: text/plain; charset="US-ASCII"

hi Michael,

thanks for the answer ... I agree. Sorry ... bad example in question ...
I'd never made such a configuration ... everytime I'm using two controller
... also on my home-office UE10 with 2 IDE-Controllers.

But much more disks had died in the last years ... but only one or two
controller in very many Suns ;-)

Ok ... I have two onboard-controller in a Sun like a E420R ... one disk on
each controller ... mirrored ... but my first problem will happen, if one
of these disks will die ... correct ?

If one disk will die the replicas will be missing from this dead disk ...
Single-User-Mode, metadb -r ... etc.

Is there any workaround to this behavior ?

Thanks Michael

(To Michael: Michael from Waibstadt nearby Sinsheim ;-)



 >> hi michael,
 >>
 >> you will have a big problem, if none of the disk die but a controller.
 >>
 >> try to mirror on another controller than c0.
 >>
 >> regards
 >> michael
 >>
 >> Michael Eble
 >> ------------------------------
 >>
 >> Systemadministration
 >> Informationstechnologie
 >> Klinikum der Stadt Ludwigshafen am Rhein gGmbH
 >> Bremserstr. 79
 >> D-67063 Ludwigshafen
 >> Germany
 >>
 >> Phone +49-621-503-2227
 >> Fax      +49-621-503-2019
 >> mailto: michael.eble at klilu.de
 >> Homepage http://www.klilu.de/
 >>
 >>
 >>
 >
 >>>>>>>> mk at lexcom-net.de Freitag, 15. Oktober 2004 09:53:03 >>>
 >
 >> Hey,
 >>
 >> I'm thinking I have a problem with mirroring the boot- and system-
 >> partions.
 >>
 >> Example:
 >> mirror of root
 >> mirror of swap
 >> mirror of usr
 >>
 >> replicas are on c0t0d0s3 and c0t1d0s3.
 >>
 >> eeprom is correct to first and second boot-device.
 >>
 >> If one of these disks would die and someone must reboot the system,
 >> it's starting only in single-user-modus, because someone must delete
 >> the missing replicas of the failed disk before.
 >>
 >> Is there any workaround for normal startup ?
 >>
 >>
 >> Regards Michael
 >> _______________________________________________
 >> SunHELP maillist  -  SunHELP at sunhelp.org
 >> http://www.sunhelp.org/mailman/listinfo/sunhelp
 >> _______________________________________________
 >> SunHELP maillist  -  SunHELP at sunhelp.org
 >> http://www.sunhelp.org/mailman/listinfo/sunhelp

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