Lucius wrote "Forgive me for being dumb here, but I'd like to ask "How?"
If you're
sharing a VM minidisk among several Linux guests, how can you update the
contents without having all of the guests brought down?"
You start with 2 LPARs and 2 VMs each has a set of shared Linux disks at
whatever level. Each can use the full capacity of the machine (Sharing
engines, channels, OSAs, etc.). When you take one side down to upgrade it
the other takes on the load. You can use one VM and 2 sets of Linux disks
and share memory if constrained inthat manner, but then VM outages take you
down.
The outage time is essentially a failover time, which depends on what you
do with the data. Being an IBM z guy, I would say that to maximize uptime
the data belongs in a zOS data sharing sysplex, where the "state" and
"lock" structures are kept in redundant coupling facilities, essentially
eliminating the failover time there, but any failover mechanism can be
used.
Joe Temple
[EMAIL PROTECTED]
845-435-6301 295/6301 cell 914-706-5211 home 845-338-8794
"Lucius, Leland"
<Leland.Lucius@ec To: [EMAIL PROTECTED]
olab.com> cc:
Sent by: Linux on Subject: Re: URGENT! really low
performance. A related question...
390 Port
<[EMAIL PROTECTED]
IST.EDU>
02/19/2003 11:39
AM
Please respond to
Linux on 390 Port
> With disk sharing and VM, the apparent outage for maintenance
> of Linux can be "virtually" eliminated.
>
Forgive me for being dumb here, but I'd like to ask "How?" If you're
sharing a VM minidisk among several Linux guests, how can you update the
contents without having all of the guests brought down?
Thanks,
Leland
