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Date:      Thu, 23 Sep 1999 13:04:11 -0700
From:      "Anderson, Douglas" <AndersonD@MTA.NET>
To:        "'FreeBSD-questions@FreeBSD.org'" <FreeBSD-questions@FreeBSD.org>
Subject:   vinum raid 1...
Message-ID:  <48506CC52C52D3119B4300508B0903B514B5E5@EXCHANGE10>

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In a two (physical) drive mirrored system what would be the impact of
putting each drive on its own scsi channel when using a two channel scsi u2
controller? Would this reduce or eliminate the write bandwidth penalty? 

Again, assuming the same setup - would vinum just alternate drives on
successive reads or... or can vinum read concurrently from both drives? 

I am attempting to decide whether to implement mirroring or simply split
data files and system/swap files between drives. Space is not an issue. I
have mild concerns regarding redundancy but want to minimize performance
losses in a small system which will employ a SQL server with a moderate size
database. Reads/writes will occur on a 98%/2% ratio but relational joins
will occur continuously.

Any advice would be appreciated.


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