"Guy Watkins" <linux-raid@xxxxxxxxxxxxxxxx> writes: > } -----Original Message----- > } From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > } owner@xxxxxxxxxxxxxxx] On Behalf Of Goswin von Brederlow > } Sent: Wednesday, August 12, 2009 10:09 PM > } To: Billy Crook > } Cc: Henry, Andrew; goswin-v-b@xxxxxx; Drew; linux-raid@xxxxxxxxxxxxxxx > } Subject: Re: raid-0 with mdadm vs lvm striping > } > } Billy Crook <billycrook@xxxxxxxxx> writes: > } > } > On Wed, Aug 12, 2009 at 04:14, Henry, Andrew<andrew.henry@xxxxxxxxxx> > } 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 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
