I'd ask why aren't they running z/VM rather than z/OS?
But if I were in IBM sales, I would ask one of the z/VM gurus in
IBM how many Linux images I could get running in an LPAR. I would
want them to run a benchmark against a VMware server to see what
the through put ability is between z/VM and Intel/AMD...
And then I'd ask questions about I/O through put, so I could show
(if it is true) that they could turn off file caching in Linux as
the z/VM system and all the controllers would cache better and
faster....
But that's me having to take care of (as a cap planner) 3 LPARs
running Linux servers at a large insurance company.
Regards,
Steve Thompson
On 10/25/2025 11:16 AM, Jon Perryman wrote:
On Fri, 24 Oct 2025 16:23:05 +0000, Dick Williams <[email protected]>
wrote:
Why would IBM want to sell a mainframe (zOS) to Google?
Do they process important transactions?
This mindset has doomed z/OS. These are the wrong questions. IBM (International
Business Machines) wants to sell to all businesses.
Not all businesses are about important transactions. Instead, ask why isn't
Google replacing their 5M Linux servers with 250,000 z/OS servers? What
business problems does IBM solve that are important to Google?
A single Google search moves hundreds of strings. The z MVST (move string) is a
single instruction residing in cache. On the other hand, the STRCPY() function
for other architectures is several instructions that reside in storage and must
be moved to cache as needed.
A Google search is heavy disk access. MVS has been running as a NAS since the
1960s.
Google developed GO 15 years ago but missed important and simple features (e.g.
recently discussed PRINTF compile time type validation).
You get what you pay for and Google pays $0 for Linux, GCC and others.
Linux is looking to eliminate big endian support despite it being of little
impact to Linux. Most endianess is handled by hardware instructions and is very
little impact to programs. https://www.phoronix.com/news/Torvalds-No-RISC-V-BE
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