Re: raid-0 with mdadm vs lvm striping

"Guy Watkins" [off-list ref] writes:

} -----Original Message-----
} From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-
} owner@vger.kernel.org] On Behalf Of Goswin von Brederlow
} Sent: Wednesday, August 12, 2009 10:09 PM
} To: Billy Crook
} Cc: Henry, Andrew; goswin-v-b@web.de; Drew; linux-raid@vger.kernel.org
} Subject: Re: raid-0 with mdadm vs lvm striping
} 
} Billy Crook [off-list ref] writes:
} 
} > On Wed, Aug 12, 2009 at 04:14, Henry, Andrew[off-list ref]
} wrote:
} >> That's what my question was:  Will raid0 (striping) be faster or easier
} to manage than lvm striping
} >
} > LVM striping won't change performance for small files. (That is files,
} > smaller than the extent size.)  To be fair, RAID-0 striping won't
} > accelerate file access for files smaller than the stripe size either.
} > However, traditionally, raid0 stripe sizes are much much smaller than
} > LVM extent sizes.  Both are however adjustable.
} 
} That sucks. LVM striping really should have a setting where it stripes
} chunks within a PE.
} 
} MfG
}         Goswin

Why not use this option?

Ignorance. :) I never use raid0 so I never needed to look for all the
stripe parameters.

-I, --stripesize StripeSize
    Gives  the  number  of  kilobytes  for  the  granularity  of the
stripes.  StripeSize must be 2^n (n = 2 to 9) for metadata in LVM1 format.
For  metadata  in  LVM2  format, the stripe size may be a larger power of 2
but must not exceed the physical extent size.

I have never use lvcreate with Linux, but have with HP-UX.  Looks about the
same, but maybe I am confused.

Guy

MfG
        Goswin
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