Re: NVMe's Namespace size

It would need the performance tools to really know, but since IBM i is sensitive to the number of IO devices he is giving you excellent advice. We always build the multiple virtual devices during installation.

Figure it this way, each device has an IO channel. One or two IO channels vs. 80, which one will be faster? Yea 80 by a long shot.

These are mirrored correct?

He is telling you best practice, is follow the advice.


Jim Oberholtzer
Agile Technology Architects

On Jan 31, 2024, at 1:11 AM, Gad Miron <gadmiron@xxxxxxxxx> wrote:

For the technically minded guys...

We have recently added 2 64Tb NVMe "drives" to an eight 64Tb-NVMe
9105-41B machine.
While configuring the new NVMes the IBM CE said that it is now
recommended to "split"
each NVMe into 400Gb Namespaces.
(they are now configured as 64TB Namespace each)
This will get us 80 "virtual drives" and in turn should get us a
performance gain.
Now, IBM CEs do not come cheap so I would like to have some rough idea what
performance gain to expect.

Can you sages try to estimate?

TIA
Gad
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