ADSM-L

Re: DB mirroring vs. RAID

1999-04-21 13:09:08
Subject: Re: DB mirroring vs. RAID
From: "James, Ron" <Rjames AT ATSGROUP DOT COM>
Date: Wed, 21 Apr 1999 11:09:08 -0600
I stand caught - No, Mine is not a Raid set - I had a limited number of
drives that I could install so I maximized the total drive space for pools
and db logs - Certainly if space permits - go for it - I wasn't willing to
lose 1/n of my drive space for Raid 5. I migrate to tape and a copy pool
immediately after completing my backups. It's a personal comfort issue - I'm
comfortable with the setup that I have - you may want the additional fault
tolerance.

Ron

                -----Original Message-----
                From:   Remeta, Mark [mailto:MRemeta AT SELIGMANDATA DOT COM]
                Sent:   Wednesday, April 21, 1999 8:35 AM
                To:     ADSM-L AT VM.MARIST DOT EDU
                Subject:        Re: DB mirroring vs. RAID

                Yes but you did not answer Reinhard's question. Was the
'primary disk' a
                RAID 5 set?


                > -----Original Message-----
                > From: James, Ron [SMTP:Rjames AT ATSGROUP DOT COM]
                > Sent: Wednesday, April 21, 1999 10:00 AM
                > To:   ADSM-L AT VM.MARIST DOT EDU
                > Subject:      Re: DB mirroring vs. RAID
                >
                > Mirroring saved my butt once - I lost the primary disk - I
replaced the
                > disk
                > and with the help of Kelly Lipp at SSSI we restored the
server from the
                > mirrored volume - and was well in under a few hours.
                >
                > Ron James
                > Network Management Specialist
                > Premiere Conferencing
                >
                >                 -----Original Message-----
                >                 From:   Reinhard Mersch
[mailto:mersch AT UNI-MUENSTER DOT DE]
                >                 Sent:   Wednesday, April 21, 1999 5:44 AM
                >                 To:     ADSM-L AT VM.MARIST DOT EDU
                >                 Subject:        DB mirroring vs. RAID
                >
                >                 Hi,
                >
                >                 again I am struggling with my ever growing
ADSM DB, not
                > knowing where to
                >                 get the additional disk space I need. An
option would be,
                > to
                > give up DB
                >                 mirroring and rely on RAID5 instead.
                >
                >                 Since RAID5 protects against
media/hardware failures, are
                > there other
                >                 threats, DB mirroring protects against and
RAID5 does not?
                > There has been
                >                 discussion on this in August 98 and Andy
Raibeck mentioned
                > partial page
                >                 writes. But how probable are they? Has
anybody out there
                > ever been in a
                >                 situation where DB mirroring (would have)
helped and RAID5
                > (would have)
                >                 not?
                >
                >                 Regards
                >
                >                 --
                >                 Reinhard Mersch
Westfaelische
                > Wilhelms-Universitaet
                >                 Zentrum fuer Informationsverarbeitung -
ehemals
                > Universitaetsrechenzentrum
                >                 Roentgenstrasse 9-13, D-48149 Muenster,
Germany      Tel:
                > +49(251)83-31583
                >                 E-Mail: mersch AT uni-muenster DOT de
Fax:
                > +49(251)83-31653
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