> I stay in shape running to catch up..
Good point :)
WBR, Sergey
Scott Rohling <scott.rohl...@gmail.com>
Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU>
01-10-15 18:05
Please respond to Linux on 390 Port
To: LINUX-390@VM.MARIST.EDU
cc:
Subject: Re: Documentation for Linux on z Systems and KVM -
new
'The speed of progress' ? Is it not moving fast enough for you, Sergey?
Perhaps we need 'dinosaur crossing' signs stamped on the z... ?
I am personally not worried about slowing down the world ... I have failed
even when actively trying ;-) I stay in shape running to catch up..
Scott Rohling
On Thu, Oct 1, 2015 at 12:40 AM, Sergey Korzhevsky <s_korzhev...@iba.by>
wrote:
> Hi Mark,
>
> Thank you for detailed answer, but, actually, your vision is not
> contradicted with mine, you just confirmed that the huge jump was made
in
> the last decade because of Linux on mainframe (in z/VM particularly).
> I hope that with people like you, the speed of progress won't be slow
> down.
>
>
> WBR, Sergey
>
>
>
>
> Mark Post <mp...@suse.com>
> Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU>
> 28-09-15 23:39
> Please respond to Linux on 390 Port
>
> To: LINUX-390@VM.MARIST.EDU
> cc:
> Subject: Re: Documentation for Linux on z Systems and KVM
-
> new
>
>
> >>> On 9/28/2015 at 02:25 AM, Sergey Korzhevsky <s_korzhev...@iba.by>
> wrote:
> > Alan Altmark wrote:
> >>> What is it about z that makes virtualization work better?
> >>50 years of work on it?
> >
> > That is interesting answer. One thing came to my mind is the live
guest
> > relocation. As far as i could find, VMware introduced that feature
> > (vMotion) in 2003, z/VM - in 2011. The same regarding network
> > (GuestLAN/VSwitch).
> > So, looks like z/VM slept all that years and was wake up by x86 world
> > recently.
>
> Having been an active participant and observer of the community for a
> while now, I think I can contribute some perspective. (From what I can
> tell, you have been also so I find your comment a little surprising.)
>
> When Linux for the mainframe was first introduced, a lot of facilities
we
> take for granted today didn't exist. Guest LANs, VSWITCHes, cooperative
> memory management and so on. That started to change pretty quickly.
> Things that actually helped running more than just a few instances of
> Linux were introduced and made life much easier. Live Guest Relocation
> wasn't needed then, because not many shops were running huge amounts of
> guests. That pain came along later. Even then, it wasn't for the same
> reason that the x86 world wanted it.
>
> Mainframe shops running Linux on z/VM didn't worry much about hardware
> failures and migrating workload to relieve overloaded servers usually
> wasn't an issue because of decades of performance and capacity
management.
> What "we" wanted it for was because z/VM was so reliable it could run
for
> years but sometimes various maintenance was important to put on the
> system. Trying to get multiple customers of the service to agree on a
> maintenance window was becoming nearly impossible, because although they
> wanted High Availability, they weren't willing to actually invest in it,
> so the workload couldn't be failed over to another server in a cluster.
>
> There was another factor, although not a technical one. Many customers
> have become checklist driven. If your product doesn't allow them to put
> check marks in all the boxes on the list, it's obviously not a good
> product and not worthy of consideration. So, z/VM development was
getting
> reports from Sales that this function was needed, just to be "in the
> game." And, being the group that they are, z/VM development wanted to
> approach the development needed in a more "system of systems" oriented
way
> than just bolting on a feature. Thus, Single System Image was born, and
> it took quite a while and a lot of people to bring to the market. Taking
> into account the various diversions that were forced on them during the
> same period of time, it's amazing they got it out as quickly as they
did.
>
> I think most people that have been in the z/VM world for a long time
would
> agree that having Linux available on the mainframe has breathed new life
> into z/VM. Since then, they've been working hard to introduce things
that
> make sense for the mainframe environment. What new items they work on,
> and what priority they have, _can_ be influenced by current and
potential
> customers. I encourage anyone who has thoughts on what those new items
> should be to speak up, whether here or in the IBMVM mailing list, or at
> SHARE. There are people in these mailing lists and at SHARE that have a
> direct line into the z/VM and Linux development groups at IBM. Take
> advantage of that.
>
>
> Mark Post
>
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