Re: 70GB load source and 5 other drives

[DrFranken <midrange@xxxxxxxxxxxx>]

Pete is exactly correct  here. The four core POWER6 unit that I have in 
a mobile rack (currently on it's way to COMMON) is a perfect example. It 
has the very last generation of IOPless large cache SCSI controllers one 
for 12 drives in an 0595 and and 24 drives in an EXP24.  With VIOS as 
the host those disks crawled. Loading partitions on it was slow. 
Performance was reasonable running on it because of sufficient arms and 
little write activity.

Reloading to IBM i 7.1 as the host they do Scream. Remember IBM i hosted 
disks get formatted with CRTNWSSTG not when you add to the ASP so that 
right there saves an hour per LPAR when building and everything is 
quicker all around.

Remember that VIOS is based on AIX and they never did the amount of 
internal disk work that IBM i has done. As a consequence drivers and 
performance of internal disk was never a focus for them, they just go SAN.

        - Larry "DrFranken" Bolhuis

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

On 4/26/2014 8:05 AM, Pete Massiello - ML wrote:

> I think to Rob's point on hosting internal disk, has something to do with the disk controller
> for internal vs external. <snip> the large cache disk controllers for 
internal disks, which
>don't perform as well under VIOS as they do under IBM i. They scream 
under IBM i.

> --
> Pete Massiello
> iTech Solutions
> http://www.itechsol.com
> http://www.iInTheCloud.com