hw vs sw raid (was Re: [TriLUG] RAID newbie question...)

[Roy Vestal]

Also, do all 4 drives have to match, like SCSI? (old school brain). I know
you can mix/match sometimes, but I haven't done ANY IDE RAID.
----- Original Message ----- 
From: "Roy Vestal" <rvestal at trilug.org>
To: <trilug at trilug.org>
Sent: Monday, August 04, 2003 3:21 PM
Subject: Re: hw vs sw raid (was Re: [TriLUG] RAID newbie question...)


> Crud, can you tell i have jet lag?  Let me rephrase:
>
> IDE chain 1 = 2 drives - Master/Slaved
> IDE chain 2 = 2 drives - Master/Slaved
>
> RAID 1 = Chain 2 mirroring Chain 1
>
> Correct?
>
> ----- Original Message ----- 
> From: "Roy Vestal" <rvestal at trilug.org>
> To: <trilug at trilug.org>
> Sent: Monday, August 04, 2003 3:18 PM
> Subject: Re: hw vs sw raid (was Re: [TriLUG] RAID newbie question...)
>
>
> > Question then,
> >  I haven't setup software raid on IDE. I've only done this with SCSI
> so...My
> > question, I have a machine that will become my "server" and I want to
raid
> > the IDE's, I simply setup 2 on Chain one and 2 on Chain 2 and RAID 1
them
> > (Chain 2 mirroring Chain 2)?
> > ----- Original Message ----- 
> > From: "Mike Johnson" <mike at enoch.org>
> > To: <trilug at trilug.org>
> > Sent: Monday, August 04, 2003 3:22 PM
> > Subject: Re: hw vs sw raid (was Re: [TriLUG] RAID newbie question...)
> >
> > Jason Tower [jason at cerient.net] wrote:
> >
> > > true story: last year i was called in to fix a system that used
software
> > > raid 1 on a data partition (but not the other partitions).  one of the
> > > disks had failed and the system would no longer boot.  i slapped a
> > > knoppix cd in the drive, brought it up, mounted the remaining raid
> > > partition, and scp'd the data to another system.  software raid 1 is a
> > > good thing :-)
> >
> > This is an important point, that perhaps may have been missed.  With HW
> > RAID, you're pretty much locked in.  If you HW RAID card dies (it
> > sucks), you either swap in the spare that you had laying around, hope
> > you can find a used one off eBay, or just kiss your data good-bye and
> > head for the tapes.  There is no 'standard' for HW RAID data.  Every
> > vendor (and oftentimes even within a vendor -- different products) has a
> > different format for how they store their blocks.  For instance, if you
> > have a HW RAID set up with 3Ware, you cannot use one of the Promise
> > (yes, they make a -true- HW IDE RAID card) if the 3Ware dies.
> >
> > If you're using software RAID, you can move the drives around and still
> > access them, or, as Jason did, even use knoppix.
> >
> > So, if you're looking for cheap, decent perfomance, just go software
> > RAID.  There is a performance hit, but the cost and flexibility make up
> > for it.
> >
> > Mike
> > -- 
> > "If life hands you lemons, YOU BLOW THOSE LEMONS TO BITS WITH
> >  YOUR LASER CANNONS!" -- Brak
> >
> > GNUPG Key fingerprint = ACD2 2F2F C151 FB35 B3AF  C821 89C4 DF9A 5DDD
95D1
> > GNUPG Key = http://www.enoch.org/mike/mike.pubkey.asc
> >
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