[geeks] Cheap Dell Servers

[Sandwich Maker]

" From: Sridhar Ayengar <ploopster at gmail.com>
" 
" Sandwich Maker wrote:
" > " One thing I'm still trying to work out is how to set the disklabel drive 
" > " parameters for a RAID.  What is the RPM of a RAID?  How does one 
" > " determine a physical sector count for a virtual disk?
" > 
" > for a simple stripe it should be easy.  rpm is rpm of individual
" > disks; sector count is sc/disk * num of disks, since that's the
" > latency of the stripe.  for a raid-5 it's not so simple, never mind
" > the complications of sw vs. hw raid.
" 
" It's RAID 5, so it should be mostly similar to that, no?

yeah, that makes sense now that i think about it.  raid parity is
distributed, right?

" > but if your software and your drives support tagged command queueing
" > it's probably all moot.  the driver doesn't have to do any elevator
" > sorting; the drives do it.
" 
" There's NCQ on the drives.  I'll have to see if the RAID controllers 
" support it.  If so, I would assume I don't have to have any particular 
" settings in my disklabels for optimization?

not for drive access.  the fs frag issue you raise has me wondering
though.
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