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

[Joseph Tate]

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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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|
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|>>
|>>
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|>
|
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