[rescue] hardware RAID, esp. EMC, vs SS20 & SSA100 w/ VXVM

[Greg A. Woods]

[ On Tuesday, April 2, 2002 at 18:36:49 (+1000), Robert Rose wrote: ]
> Subject: Re: [rescue] somewhat OT: secondary market storage?
>
> At 06:49 PM 1/04/2002 -0600, some un-named being posited:
> >
> > Hardware RAID will always be better than software RAID.
> 
> Sorry to disagree with you there, but when it comes to EMC at least, that's 
> not the case.  A few years ago I found once you fill the write cache (I 
> think it was 1GB), performance drops significantly,

Yeah, well what do you expect!?!?!?  

> such that a Sparc 20 - 
> SSA100 - VXVM combination performed better.  That had the EMC techs running 
> in circles, then they claimed that my test wasn't fair (vxbench) because it 
> wasn't a real-world simulation.

Hmmm....  Same disks?  Same RAID config?  Did you scale the benchmark
parameters to match the relative scaling of the host's RAM too?

-- 
								Greg A. Woods

+1 416 218-0098;  <gwoods at acm.org>;  <g.a.woods at ieee.org>;  <woods at robohack.ca>
Planix, Inc. <woods at planix.com>; VE3TCP; Secrets of the Weird <woods at weird.com>