Re: Disk requirement (performance-wise) on a Power 7 replacing a System i 520

[DrFranken <midrange@xxxxxxxxxxxx>]

Given that the 70GB Arms themselves are a bit stale, why not? :-)

In another thread just days ago we talked about why the newer 'spinny' 
drives are bigger but none of them are 15K RPM. Bottom line was SSDs in 
the mix allow fewer, slower, Spinny disks when complimented by some 
crazy fast SSDs.

In this situation it's possible to put in say 2 SSDs and mirror them 
along with some very big 10K RPM disks for the rest of everything. 
Problem is that in the CEC the RAID cards just aren't that zippy nor do 
they have monster cache or 6Gb connection speed. And should he be the 
guinea pig for that?

        - Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 10/22/2013 3:01 PM, rob@xxxxxxxxx wrote:

> Should 70GB drives be used for stale data?  These drives are so huge that
> wouldn't one be better off just using them for non volatile data and use a
> bunch of 4 or 8gb drives instead for their more volatile data?  This way
> you get more arms?
>
> Not a real question.  It's just something to put how times are changing
> into perspective.  With disks available in >800Gb size, which is currently
> 22 times the size of Jeff's current drives (which is close to the ratio
> between 4 and 70GB drives), let's not assume that such monsters are best
> just utilized for stale non volatile data.
>
> Just speaking as someone who once went from 42 arms down to 7 and got much
> better performance.
>
>
> Rob Berendt