Date: Fri, 3 Sep 1999 18:55:00 -0500 From: Gerd Knops <gerti@bitart.com> To: Greg Lehey <grog@lemis.com> Cc: questions@FreeBSD.ORG Subject: Re: Vinum: Best performance from mirror setup with two disks Message-ID: <19990903235501.9687.qmail@camelot.bitart.com> In-Reply-To: <19990904090824.Y95378@freebie.lemis.com> References: <19990903232137.9612.qmail@camelot.bitart.com> <19990904090824.Y95378@freebie.lemis.com>
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Greg Lehey wrote: > On Friday, 3 September 1999 at 18:21:36 -0500, Gerd Knops wrote: > > Hi, > > > > I have read everything I could find about vinum (man pages, recent > > questions Mailing list, Vinum intro) but I am still not quite sure: > > > > What is the best performing setup to get mirroring with two disks? > > > > I understand that I just set up one plex per disk. Write performance goes > > down due to double writes, read performance goes up since vinum will > > alternate reads between the plexis. > > Correct. > > > What I don't quite understand is if striping gives me an added advantage > > in this scenario. > > It depends a lot on your usage. In general, a striped plex will give > more even access to the two drives, so the performance is likely to be > better. > I still don't get that. In the case of a two disk mirror, how can striping help performance if reads are already alternated between the two plexes (which are on different disks)? Gerd To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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