} -----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? -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 -- 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
