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

[Roy Vestal]

Groovy thanks.
----- Original Message ----- 
From: "Joseph Tate" <jtate at dragonstrider.com>
To: <trilug at trilug.org>
Sent: Monday, August 04, 2003 3:27 PM
Subject: Re: hw vs sw raid (was Re: [TriLUG] RAID newbie question...)


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> You can mirror at the partition level.
>
> Roy Vestal wrote:
>
> |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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