Re: DB mirroring vs. RAID
1999-04-22 09:33:47
Subject: |
Re: DB mirroring vs. RAID |
From: |
Dwight Cook <decook AT AMOCO DOT COM> |
Date: |
Thu, 22 Apr 1999 08:33:47 -0500 |
Yes, as Ken stated below, our DB mirrors (mirrored via adsm) have
provided us uninterrupted service for about 3-4 years now.
Actually long ago there was a case where we lost a drive which
contained a DB vol and it wasn't noticed for about 3 days (yes, our
monitoring has improved since then)
AND
another time I was cleaning up "stuff" and by accident deleted a
functioning DB vol (talk about panic!) but the mirror kept things
running smooth with no interruptions and I corrected my mistake FAST.
Dwight
______________________________ Reply Separator _________________________________
Subject: Re: DB mirroring vs. RAID
Author: ken x. sparks at tulsa,itss
Date: 4/21/99 5:34 PM
Shouldn't the mirror allow you to continue without interruption? Ours
do. You just replace the failed drive and resync the filesystem.
______________________________ Reply Separator _________________________________
Subject: Re: DB mirroring vs. RAID
Author: MRemeta (MRemeta AT SELIGMANDATA DOT COM) at unix,mime
Date: 4/21/99 2:08 PM
So if it was on a RAID 5 set and you had lost one disk, your database would
have still been intact and you would have had 0 hours of down time (assuming
the RAID 5 worked the way it was suppose to).
Sounds like a pretty good case for RAID 5 instead of mirroring.
> -----Original Message-----
> From: James, Ron [SMTP:Rjames AT ATSGROUP DOT COM]
> Sent: Wednesday, April 21, 1999 1:09 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: DB mirroring vs. RAID
>
> 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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- DB mirroring vs. RAID, Reinhard Mersch
- Re: DB mirroring vs. RAID, James, Ron
- Re: DB mirroring vs. RAID, Remeta, Mark
- Re: DB mirroring vs. RAID, Prather, Wanda
- Re: DB mirroring vs. RAID, James, Ron
- Re: DB mirroring vs. RAID, Remeta, Mark
- Re: DB mirroring vs. RAID, Kenneth Sparks
- Re: DB mirroring vs. RAID, Paul Zarnowski
- Re: DB mirroring vs. RAID, Reinhard Mersch
- Re: DB mirroring vs. RAID,
Dwight Cook <=
- Re: DB mirroring vs. RAID, Robinson, Cris
- Re: DB mirroring vs. RAID, James, Ron
- Re: DB mirroring vs. RAID, Trevor Foley
- Re: DB mirroring vs. RAID, Simon Watson
- Re: DB mirroring vs. RAID, Remeta, Mark
- Re: DB mirroring vs. RAID, Kenneth Sparks
- Re: DB mirroring vs. RAID, osama
- Re: DB mirroring vs. RAID, osama
- Re: DB mirroring vs. RAID, Trevor Foley
- Re: DB mirroring vs. RAID, Reinhard Mersch [mailto:mersch
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