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Date:      Sat, 28 Sep 1996 06:15:34 -0500
From:      rkw@dataplex.net (Richard Wackerbarth)
To:        mika ruohotie <bsdscsi@shadows.aeon.net>
Cc:        scsi@freebsd.org
Subject:   Re: striping/mirroring?
Message-ID:  <v02140b00ae72b4dbc331@[208.2.87.4]>

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>> Look at what striping does...
>> It takes a number of drives and makes it appear that they are one large
>> (faster) drive.
>
>i know
>
>> Mirroring takes two drives of the same size and stores the information
>> redundantly.
>
>i know
>
>> Thus if you were to mirror a 4 drive combination to a single drive, that
>> drive would have to be 4 times as large. It would also need to be fast.
>
>it should be huge, yes. fast, no, if i dont want to mirror all i am
>striping... or if i do the way i was planning... using 2 gig drives,
>and only _use_ the space of one disk i'm mirroring to...

I'm lost. How can the mirror be slower than the drive that it is mirroring
unless it is a "read mostly" situation and you are guaranteed no write
bursts?

>original question was, can i do it with freebsd?
>
>seems to me answer is no.

I think that the answer is "yes". You can you elaborate? Describe the
configuration that you have in mind.





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