Sharing DASD on Hercules should be trivial. Same for Flex-ES. Unless they code
against the sharing of the underlying files (eg: with an EXCL open), then
simply define multiple disks with the same file.
This quickly leads to things like CD-ROM (or just .iso files) as FBA, even
IPLable. Linux loopback mount comes in handy for accessing zLinux filesystems
from the host.
-- R;
----- Original Message -----
From: John Summerfield [EMAIL PROTECTED]
Sent: 09/20/2006 07:48 PM
To: [email protected]
Subject: Re: Getting to 64-bit systems *legitimately*...
David Boyes wrote:
In such an environment, lack of VM might not matter so much, the
virtualisation could be done natively rather than in the emulated
environment.
Indeed. Simply run multiple copies of Hercules. This only works, of
course,
as long as you're not doing things that depend on z/VM...
Or (more generally) depending on easy expansion of virtualization.
I'd argue the above is essentially the same argument as Linux in LPAR.
You win on hardware availability, but you lose big time on
manageability, which is (IMHO) the biggest argument for Linux on Z in
the first place.
I've always thought that on LPARs one has to deal in real DASD, printers
etc.
With Herc under Linux, one has all the tools Linux provides at one's
disposal to clone Hercules/Linux systems. And there are various
copy-on-write/shadow facilities available so one can now, I think, share
ro filesystems.
I don't expect one could run up Adam's 40000 virtual Linuxes, but I'd
expect one to get more than two or three.
--
Cheers
John
-- spambait
[EMAIL PROTECTED] [EMAIL PROTECTED]
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