Re: RAID-5 vs. Disk Mirroring

From: <Jer_at_execpc.com>
Date: 1996/01/29
Message-ID: <NEWTNews.822968726.10066.jer_at_smallmouth.execpc.com>#1/1


What about just mirroring vs RAID-5? We are noticing a HUGE performance problem going from Raid-5 to Mirroring and am wondering if it's the mirror or the addition of logs/archive mode (wasn't on before)?

In article <1996Jan29.181912.5617_at_newshost.micro.ti.com>, <mstrong_at_wotangate.sc.ti.com> writes:
> Newsgroups: comp.databases.oracle
> Path:

daily-planet.execpc.com!homer.alpha.net!solaris.cc.vt.edu!newsfeed.internetmci. com!swrinde!cs.utexas.edu!news.ti.com!newshost!raiders!mstrong
> From: mstrong_at_wotangate.sc.ti.com (Mike Strong,713 274 3317,0883922)
> Subject: Re: RAID-5 vs. Disk Mirroring
> Message-ID: <1996Jan29.181912.5617_at_newshost.micro.ti.com>
> Sender: news_at_newshost.micro.ti.com
> Reply-To: mstrong_at_wotangate.sc.ti.com
> Organization: Texas Instruments Inc.
> References: <4ebtuu$9ln_at_maverick.tad.eds.com>
> Date: Mon, 29 Jan 1996 18:19:12 GMT
> Lines: 44
>
> We just made the decision to go with striping/mirroring instead of RAID-5.
 The RAID-5
> performance issues were one major reason. The other reason is that in order
 to add
> drives to a RAID-5 array, the database needs to be exported, the new drives
 added,
> the disks reformatted, and the database imported (this is according to a SUN
 rdbms
> guru and our system admin; don't yell at me if this isn't correct). We did
 not want
> to take the downtime hit for the
 export/install/format/praying/import/praying.
>
> My boss was not happy with the disk cost (1G = 500M mirrored), but he really
 did not
> like the downtime costs.
>
> Hope this helps,
>
> Mike Strong
> Oracle DBA
> Texas Instruments, Inc., Houston
> (713) 274-3317
>
> My opinions only.
>
> In article 9ln_at_maverick.tad.eds.com, bob_at_latcost1.alaao.ats.eds.com (Bob
 Stewart) writes:
> > BBAP (bbap_at_aol.com) wrote:
> > : Does anyone have experience to share on either RAID-5 or Disk Mirroring.
 

> > : We are trying to make a decision on a direction. The concern is which
> > : method will ensure that data will be there (no loss is permited), while
> > : not comprimising performance. Cost is not a consideration.
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >
> > When do I start?
> >
> > Seriously. If cost is not really a consideration, then don't bother
> > looking at RAID5. RAID5 solutions are considerably slower on average
> > than mirroring solutions. Both are reliable.
> >
> > Later.
> > --
> > Bob Stewart ASE
> > (310) 335-7152 Air Transportation Division
> > bob_at_latcost1.alaao.ats.eds.com
> >
> > I am definitely NOT speaking for EDS.
>
>
>
>
>
Received on Mon Jan 29 1996 - 00:00:00 CET

Original text of this message