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RE: [linux-lvm] LILO configuration for LVM "boot" filesystem



> From: linux-lvm-admin sistina com [mailto:linux-lvm-admin sistina com]On
> Behalf Of Jack McKinney
> 
> Big Brother tells me that Steve Wray wrote:
> > > 
> > > LV are generally slower than other types of storage.  Since the
> > > boot partition is generally cyl 0 it's on the fastest storage
> > > available (short of tmpfs).  
> > 
> > Proportionally, how much slower is it? 50%? 25%? 12%? 
> > less than 1% slower?
> 
[snip]
> 
>     In other words, every block read that goes through LVM adds basically
> a division, a memory lookup and an addition.  The time it takes 
> to transfer
> the block from the drive is EONs compared to the time it takes to perform
> a couple of arithmetical computations.

Unless the machine in question is an i386 with no math copro?
8-)

Sounds good to me; I was surprised someone raised a speed issue
for /tmp on a LV.
Are there any other (good) reasons to have /tmp (or anything else other
than /boot) on a 'real' partition rather than on LV?

How about swap on LV? Or does swap need to be used before the LV's
are accessible?




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