I think to Rob's point on hosting internal disk, has something to do with the disk controller for internal vs external. Knowing Group Deco they have 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. It might have something to do with the 512 vs 520 byte disk size and the extra sector that is required for reading the disk and converting it. I know that this has been partially resolved with new firmware and PTFs.

I think hosting IBM i with IBM i is certainly easier and if you know IBM i, you have all the skills you require. But I will say, that I was very impressed setting up VIOS using virtual Fibre Channel as compared to vSCSI for my disk. If you have only used VIOS with vSCSI, then you might want to give virtual Fibre Channel a look. It basically removes the carving up of the LUNS from VIOS, and allows the SANs to do the work, and VIOS is more of the medium to get the disks from the SAN to the hosting partition.


Pete Massiello
iTech Solutions

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Mitchell, Dana
Sent: Friday, April 25, 2014 12:49 PM
To: Midrange Systems Technical Discussion
Subject: RE: 70GB load source and 5 other drives

I have also heard this repeated by several IBMers in the past. At the time it sounded like there was no technical reason for it, mostly a support issue. As in getting someone VIOS (AIX) fluent to talk about disk storage with someone i fluent.

Is this still the case, or have the support issues been ironed out? I attended several VIOS sessions in Austin and it appears that VIOS is getting better all the time so it may become a viable tool for us in the future.


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Friday, April 25, 2014 9:20 AM
To: Midrange Systems Technical Discussion
Subject: Re: 70GB load source and 5 other drives

Tangentially, I will say that I was not impressed with trying to host internal disk via VIOS to my lpars of IBM i. The people I talked to suggested that I reserve hosting IBM i disk under vios to only SAN attached storage. And not internal drives.

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