Re: Mounting a filesystem *really* read-only

[Mark Post]

>>> On 6/8/2009 at 11:18 PM, Shane Ginnane  wrote: 
-snip-
> If you attempt to mount a *clean* ext3 f/s as ext2 you get the warning -
> and a successful mount.
> With a dirty journal it refuses to mount as ext2 (ro *or* rw).

So, make the file system really be ext2, and not ext3.  If all they're looking 
for is a quick fix to a short-term problem, a very small minidisk would suffice 
for the "flag."


Mark Post

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: Mounting a filesystem *really* read-only

[Shane Ginnane]

Mark wrote on 09/06/2009 11:02:22 AM:

> > Second (as Mark noted) - you may think you can mount the FS R/O and
prevent
> > the log from being replayed by specifying you want a non-journaled FS
(aka
> > EXT2) - which may (and will) lead to the FS being marked dirty (as
Shane
> > noted) - requiring a 'fsck' to be performed - requiring WRITE access
(bad..
> > very bad !)
>
> The fsck is _not_ required, so write access is not required.

Sorry Mark, I'm in agreement with Ivan.
I just did a test on x86 as at the moment I don't have a zLinux system I
can break filesystems on.
If you attempt to mount a *clean* ext3 f/s as ext2 you get the warning -
and a successful mount.
With a dirty journal it refuses to mount as ext2 (ro *or* rw). A
subsequent mount as ext3 (ro) runs the journal regardless as has been
discussed I think. It shows as ro in /proc/mounts.

Shane ...

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: Mounting a filesystem *really* read-only

[Mark Post]

>>> On 6/8/2009 at  8:02 PM, Ivan Warren  wrote: 
> Second (as Mark noted) - you may think you can mount the FS R/O and prevent 
> the log from being replayed by specifying you want a non-journaled FS (aka 
> EXT2) - which may (and will) lead to the FS being marked dirty (as Shane 
> noted) - requiring a 'fsck' to be performed - requiring WRITE access (bad.. 
> very bad !)

The fsck is _not_ required, so write access is not required.


Mark Post

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: Mounting a filesystem *really* read-only

[Ivan Warren]

Ted Rodriguez-Bell wrote:

The first thing we tried was just to have B mount the disks read-only
and check for a flag file; if that file (we'll call it IN_USE) exists,
don't do anything.  If it doesn't, then A has shut down nicely and
it's safe to grab the filesystem read-only.



Hrmm...

Wait a minute !

Are you saying side A is using the filesystem R/W and you are attempting
to mount the filesystem on side B R/O ?

And *THEN* you are trying to see any modifications made on side A from
side B ?



That's very *VERY* unreliable !

First, as you noted, ext3 is a journaled filesystem.. So this means that
any changes made by side A only have meaning if you can replay the log.

Second (as Mark noted) - you may think you can mount the FS R/O and
prevent the log from being replayed by specifying you want a
non-journaled FS (aka EXT2) - which may (and will) lead to the FS being
marked dirty (as Shane noted) - requiring a 'fsck' to be performed -
requiring WRITE access (bad.. very bad !)

Third..

If you mount the fs R/O and read data off of it - there is NO GUARANTEE
- that the FS manager will reread that very same block if it is already
cached.. So your view of the FS is likely going to be skewed.. Or you
could be reading something completely different and unrelated... Which
in the event you are trying to read an hyperblock, alloc map or other
forms of meta data, could lead to a system panic if the system believes
the FS has gone completely insane (which it could since it cannot relate
the changes made by side A).
...
ext2 and/or ext3 is (as I see it) never been designed to be used with
concurrent access in mind.

Personally, I would *NOT* tread in those waters (whatever the
architecture !)

I would strongly suggest you use a filesystem that is designed to be
accessed concurrently by multiple systems (OCFS2 maybe ?)

--Ivan

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390


smime.p7s
Description: S/MIME Cryptographic Signature

Re: Mounting a filesystem *really* read-only

[Mark Post]

>>> On 6/8/2009 at  7:38 PM, Shane Ginnane  wrote: 
>>  If the access will truly be read-only, then mount the file system as
>> ext2, and not ext3.
> 
> I don't believe that will work if the dirty flag is on - which it will be
> if you are worried about journal replay on (re-)mount.

It will work as long as you don't try to run fsck against it.  The file system 
driver will whine, but it will mount it.


Mark Post

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: Mounting a filesystem *really* read-only

[Shane Ginnane]

> If the access will truly be read-only, then mount the file system as
> ext2, and not ext3.

I don't believe that will work if the dirty flag is on - which it will be
if you are worried about journal replay on (re-)mount.

Shane ...

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

subscribe

[D Waldo Anderson]

dwaldoanderson


--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
<>

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Ron Wells]

Alan
Just sent Carlos an email...see what he says..




From:
Alan Altmark 
To:
LINUX-390@VM.MARIST.EDU
Date:
06/08/2009 09:34 AM
Subject:
Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update
Sent by:
Linux on 390 Port 



On Monday, 06/08/2009 at 10:27 EDT, Shawn Wells  wrote:
> There is one in Atlanta -- the Atlanta System z Linux Council.
>
> I'm not aware of a formal webpage for it, but Carlos Torres
>  of IBM runs the show.  If you ping him, I'm sure
> you can get on meeting notices.

As you note, the Linux Executive Councils are IBM events, not really user
groups.  They do, however, provide the nucleus to form a regional user
group that can meet as and where it wishes.

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

--
Email Disclaimer
This  E-mail  contains  confidential  information  belonging to the sender, 
which  may be legally privileged information.  This information is intended 
only  for  the use of the individual or entity addressed above.  If you are not 
 the  intended  recipient, or  an  employee  or  agent responsible for 
delivering it to the intended recipient, you are hereby notified that any 
disclosure,  copying, distribution, or the taking of any action in reliance on 
the contents of the E-mail or attached files is strictly prohibited.

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[David Boyes]

> We are  Ky/So.Ill /So.Ind area.

I wonder if UKy would spare you a classroom for a day? They did a bang-up job 
when they hosted VM Workshop long ago. IUPUI or Purdue might be other options 
if they're still IBM customers. 

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[David Boyes]

> There is one in Atlanta -- the Atlanta System z Linux Council.

Yes, they just met on Friday, in fact. Pretty good attendance as well -- 40+ 
people. 

Pretty much all it takes to start a user group is some interest, somewhere to 
meet, a box of donuts and a bucket of coffee from your local coffee shop. The 
IBM sales people do have some capability to help, and they have access to the 
customer lists for geographical areas that can help spread the word quickly. 

Talk to your IBM rep, and many of us out here do come speak at events like this 
for little or no cost (give me an audience, and I'm pretty much 
available...8-)). 

-- db

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Ron Wells]

We are  Ky/So.Ill /So.Ind area.



From:
"Melancon, Ruddy" 
To:
LINUX-390@VM.MARIST.EDU
Date:
06/08/2009 09:17 AM
Subject:
Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update
Sent by:
Linux on 390 Port 



I looked at the list of user groups on the web site.  I did not see any
located in the south [Louisiana, Mississippi, Alabama, Georgia].  Has
anyone ever tried to start a VM/Linux User Group in the south?

Ruddy A. Melancon
IT Systems Specialist, Senior
Alabama Department of Transportation
334-353-6323

-Original Message-
From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Alan
Altmark
Sent: Monday, June 08, 2009 8:24 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

On Monday, 06/08/2009 at 08:50 EDT, Ron Wells 
wrote:
> Is there a group around So.Indiana area..

http://www.vm.ibm.com/events/usergrps.html contains the list we know
about.  You are sitting between CAVMEN (Chicago) and MVMRUG (Columbus,
OH).

A few years ago I spoke at an IBM-sponsored VM/Linux event in St. Louis.
There appeared to be enough people to seed a new user group, but it never
got off the ground.  (Unfortunately I don't remember details.)

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

--
Email Disclaimer
This  E-mail  contains  confidential  information  belonging to the sender, 
which  may be legally privileged information.  This information is intended 
only  for  the use of the individual or entity addressed above.  If you are not 
 the  intended  recipient, or  an  employee  or  agent responsible for 
delivering it to the intended recipient, you are hereby notified that any 
disclosure,  copying, distribution, or the taking of any action in reliance on 
the contents of the E-mail or attached files is strictly prohibited.

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Ron Wells]

Thanks Shawn >> will look into it



From:
Shawn Wells 
To:
LINUX-390@VM.MARIST.EDU
Date:
06/08/2009 09:26 AM
Subject:
Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update
Sent by:
Linux on 390 Port 



There is one in Atlanta -- the Atlanta System z Linux Council.

I'm not aware of a formal webpage for it, but Carlos Torres
 of IBM runs the show.  If you ping him, I'm sure
you can get on meeting notices.



Melancon, Ruddy wrote:
> I looked at the list of user groups on the web site.  I did not see any
located in the south [Louisiana, Mississippi, Alabama, Georgia].  Has
anyone ever tried to start a VM/Linux User Group in the south?
>
> Ruddy A. Melancon
> IT Systems Specialist, Senior
> Alabama Department of Transportation
> 334-353-6323
>
> -Original Message-
> From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of
Alan Altmark
> Sent: Monday, June 08, 2009 8:24 AM
> To: LINUX-390@VM.MARIST.EDU
> Subject: Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update
>
> On Monday, 06/08/2009 at 08:50 EDT, Ron Wells 
> wrote:
>
>> Is there a group around So.Indiana area..
>>
>
> http://www.vm.ibm.com/events/usergrps.html contains the list we know
> about.  You are sitting between CAVMEN (Chicago) and MVMRUG (Columbus,
> OH).
>
> A few years ago I spoke at an IBM-sponsored VM/Linux event in St. Louis.
> There appeared to be enough people to seed a new user group, but it
never
> got off the ground.  (Unfortunately I don't remember details.)
>
> Alan Altmark
> z/VM Development
> IBM Endicott
>
> --
> For LINUX-390 subscribe / signoff / archive access instructions,
> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
visit
> http://www.marist.edu/htbin/wlvindex?LINUX-390
>
> --
> For LINUX-390 subscribe / signoff / archive access instructions,
> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
visit
> http://www.marist.edu/htbin/wlvindex?LINUX-390
>


--
Shawn Wells
Global System z Platform & Alliances Manager
Cell:(+1) 443-534-0130  (GMT -5)
EMail:   s...@redhat.com

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

--
Email Disclaimer
This  E-mail  contains  confidential  information  belonging to the sender, 
which  may be legally privileged information.  This information is intended 
only  for  the use of the individual or entity addressed above.  If you are not 
 the  intended  recipient, or  an  employee  or  agent responsible for 
delivering it to the intended recipient, you are hereby notified that any 
disclosure,  copying, distribution, or the taking of any action in reliance on 
the contents of the E-mail or attached files is strictly prohibited.

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Alan Altmark]

On Monday, 06/08/2009 at 10:27 EDT, Shawn Wells  wrote:
> There is one in Atlanta -- the Atlanta System z Linux Council.
>
> I'm not aware of a formal webpage for it, but Carlos Torres
>  of IBM runs the show.  If you ping him, I'm sure
> you can get on meeting notices.

As you note, the Linux Executive Councils are IBM events, not really user
groups.  They do, however, provide the nucleus to form a regional user
group that can meet as and where it wishes.

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: Mounting a filesystem *really* read-only

[Marcy Cortes]

You forgot one :)
- Must not use GDPS Hyperswap.


Marcy

"This message may contain confidential and/or privileged information. If you 
are not the addressee or authorized to receive this for the addressee, you must 
not use, copy, disclose, or take any action based on this message or any 
information herein. If you have received this message in error, please advise 
the sender immediately by reply e-mail and delete this message. Thank you for 
your cooperation."


-Original Message-
From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Alan 
Altmark
Sent: Monday, June 08, 2009 6:28 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] Mounting a filesystem *really* read-only

On Monday, 06/08/2009 at 05:09 EDT, "van Sleeuwen, Berry"
 wrote:
> Be aware that if you do use reserve/release you *MUST* set the DASD to
> shared if you are running in multiple VM's.

Reminder of cross-system Reserve/Release requirements for minidisks:
- Must be a full-pack minidisk
- MDISK must define disk with mode MWV
- SYSTEM CONFIG must define the volume as SHARED

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

MIDAWs support and SLES9 & SLES10 under z/VM 5.3

[Shedlock, George]

I am sending this for a friend who seems to be having difficulty posting it 
himself.

 We are looking at activating MIDAWs support on one of our disk subsystems.  
The disk subsystem is split between z/OS and z/VM (5.3 RSU 0802).  I see that 
z/VM support MIDAWs for guest operating systems.  My question is does SLES9 or 
SLES10 have any support in it for MIDAW.  I did search the Novel website but 
did not get any hits.


George Shedlock Jr
AEGON Information Technology
AEGON USA
502-560-3541

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Shawn Wells]

There is one in Atlanta -- the Atlanta System z Linux Council.

I'm not aware of a formal webpage for it, but Carlos Torres
 of IBM runs the show.  If you ping him, I'm sure
you can get on meeting notices.



Melancon, Ruddy wrote:

I looked at the list of user groups on the web site.  I did not see any located 
in the south [Louisiana, Mississippi, Alabama, Georgia].  Has anyone ever tried 
to start a VM/Linux User Group in the south?

Ruddy A. Melancon
IT Systems Specialist, Senior
Alabama Department of Transportation
334-353-6323

-Original Message-
From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Alan 
Altmark
Sent: Monday, June 08, 2009 8:24 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

On Monday, 06/08/2009 at 08:50 EDT, Ron Wells 
wrote:


Is there a group around So.Indiana area..



http://www.vm.ibm.com/events/usergrps.html contains the list we know
about.  You are sitting between CAVMEN (Chicago) and MVMRUG (Columbus,
OH).

A few years ago I spoke at an IBM-sponsored VM/Linux event in St. Louis.
There appeared to be enough people to seed a new user group, but it never
got off the ground.  (Unfortunately I don't remember details.)

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390




--
Shawn Wells
Global System z Platform & Alliances Manager
Cell:   (+1) 443-534-0130  (GMT -5)
EMail:  s...@redhat.com

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Melancon, Ruddy]

I looked at the list of user groups on the web site.  I did not see any located 
in the south [Louisiana, Mississippi, Alabama, Georgia].  Has anyone ever tried 
to start a VM/Linux User Group in the south?

Ruddy A. Melancon
IT Systems Specialist, Senior
Alabama Department of Transportation
334-353-6323

-Original Message-
From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Alan 
Altmark
Sent: Monday, June 08, 2009 8:24 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

On Monday, 06/08/2009 at 08:50 EDT, Ron Wells 
wrote:
> Is there a group around So.Indiana area..

http://www.vm.ibm.com/events/usergrps.html contains the list we know
about.  You are sitting between CAVMEN (Chicago) and MVMRUG (Columbus,
OH).

A few years ago I spoke at an IBM-sponsored VM/Linux event in St. Louis.
There appeared to be enough people to seed a new user group, but it never
got off the ground.  (Unfortunately I don't remember details.)

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Ron Wells]

Alan
Thanks for ref... we are south 7hrs from Chicago and 5 to Ohio
...approx... still see nothing close by.. but still hoping a group may
form around area ...



From:
Alan Altmark 
To:
LINUX-390@VM.MARIST.EDU
Date:
06/08/2009 08:24 AM
Subject:
Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update
Sent by:
Linux on 390 Port 



On Monday, 06/08/2009 at 08:50 EDT, Ron Wells 
wrote:
> Is there a group around So.Indiana area..

http://www.vm.ibm.com/events/usergrps.html contains the list we know
about.  You are sitting between CAVMEN (Chicago) and MVMRUG (Columbus,
OH).

A few years ago I spoke at an IBM-sponsored VM/Linux event in St. Louis.
There appeared to be enough people to seed a new user group, but it never
got off the ground.  (Unfortunately I don't remember details.)

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

--
Email Disclaimer
This  E-mail  contains  confidential  information  belonging to the sender, 
which  may be legally privileged information.  This information is intended 
only  for  the use of the individual or entity addressed above.  If you are not 
 the  intended  recipient, or  an  employee  or  agent responsible for 
delivering it to the intended recipient, you are hereby notified that any 
disclosure,  copying, distribution, or the taking of any action in reliance on 
the contents of the E-mail or attached files is strictly prohibited.

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: Mounting a filesystem *really* read-only

[Alan Altmark]

On Monday, 06/08/2009 at 05:09 EDT, "van Sleeuwen, Berry"
 wrote:
> Be aware that if you do use reserve/release you *MUST* set the DASD to
> shared if you are running in multiple VM's.

Reminder of cross-system Reserve/Release requirements for minidisks:
- Must be a full-pack minidisk
- MDISK must define disk with mode MWV
- SYSTEM CONFIG must define the volume as SHARED

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Alan Altmark]

On Monday, 06/08/2009 at 08:50 EDT, Ron Wells 
wrote:
> Is there a group around So.Indiana area..

http://www.vm.ibm.com/events/usergrps.html contains the list we know
about.  You are sitting between CAVMEN (Chicago) and MVMRUG (Columbus,
OH).

A few years ago I spoke at an IBM-sponsored VM/Linux event in St. Louis.
There appeared to be enough people to seed a new user group, but it never
got off the ground.  (Unfortunately I don't remember details.)

Alan Altmark
z/VM Development
IBM Endicott

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390

Re: CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update

[Ron Wells]

Is there a group around So.Indiana area..



From:
"Chicago Area VM (and Linux) Enthusiasts" 
To:
LINUX-390@VM.MARIST.EDU
Date:
06/08/2009 01:38 AM
Subject:
CAVMEN Meeting on Thursday, June 18, 2009 - Agenda Update
Sent by:
Linux on 390 Port 



Meeting Agenda Change:

A third afternoon session has been added.  The session start times
have changed.  Please read carefully.

The third quarter meeting of the Chicago Area VM (and Linux)
Enthusiasts will be held on Thursday, June 18, 2009.


--

Meeting Location:

This quarter's meeting will be held at the Hewitt Associates 'East
Campus' located at 100 Half Day Road, in Lincolnshire, IL. We will
meet in the Lower Level Conference Room in Building 98.

If you have not attended a meeting at this location before, or you
are not familiar with the area,
Click here for
additional information on directions, maps, lodging and dining.

--

Attendance:

We would like to request a count of expected attendees by the Monday
before the meeting, so that we may plan appropriately for arranging
the facilities, and for refreshments and lunch, should one of the
vendors wish to provide them. If you are planning to attend, PLEASE
send an E-Mail by that date to
cav...@comcast.net with a subject line of
"Meeting Attendance".

This is meant to be a facilities planning aid and should not be
interpreted as a registration requirement. If you suddenly become
available at the last minute, please feel free to attend even if you
have not responded.

Thank you in advance for your cooperation in this matter.

--

Final Meeting Agenda:

9:00 AM Best Fits for Linux on System z - How and Why

This presentation will outline the architecture behind Linux running
on System z, and show which applications are BEST run on System z
Linux, and why they are best fits. The speaker will show which
questions and approaches have worked and give real customer examples
that validate this approach. We will also cover applications which
work extremely well on System z Linux, and the reasons why, in a
competitive situation, System z Linux could be the better choice for
your workload.

The speaker will be Paul Augustyniak of the IBM Corporation.

10:30 AMCoffee Break

10:45 AMAn Update on how IBM is consolidating computers to
double capacity - IBM Big Green ECM project

In 2007, IBM announced that its Project Big Green would spur a global
shift to Linux on the mainframe. Further, IBM claimed to "double
computing capacity with no increase in our carbon output by 2010."
IBM also announced that we would consolidate 3,900 of our own
distributed servers to 33 System z computers in 3 years.

Is it possible to achieve such massive consolidation? Here's an
update on how it is being done.

The speaker will be Paul Augustyniak of the IBM Corporation.

12:15 PMAdministration and Vendor Announcements

12:30 PMLunch Break

1:30 PM SUSE Linux Enterprise 11 - Evolutionary change

How is it better? What has changed? Technical improvements in SUSE
Linux Enterprise 11 will be discussed and demonstrated, from a newer
kernel to high-availability. Hear about virtualization, green-IT, and
appliance strategies. Bring your questions, and a USB drive to get
ISO files of the architecture of your choosing.

The speaker will be Don Vosburg of Novell, Inc.

3:00 PM Coffee Break

3:05 PM Red Hat Update

With the release of RHEL 5.4 and RHEL 6.0 around the corner, what can
customers expect? Where is Red Hat taking Linux?

The speaker will be Shawn Wells of Red Hat, Inc.

3:35 PM Coffee Break and Prize Drawing

3:50 PM Managing your RHEL VMs with Red Hat Network Satellite

Red Hat Network (RHN) Satellite is a tool which can provision,
manage, update, and monitor your RHEL VMs running on System z -- with
the added bonus of managing your distributed systems too. In this
session we will talk through how RHN Satellite works, step through
provisioning RHEL VMs on a System z, show how to deploy your own
(custom) applications, give an overview of the internal communication
subsystems, then proceed with a live demo. If network conditions are
right, we will remote into Red Hat's z9 and detail out our internal
configuration.

The speaker will be Shawn Wells of Red Hat, Inc.

4:50 PM Free-for-All

Members will attempt to answer any reasonable VM or hardware related
questions. If you are having a problem and want to find out if others
are experiencing it, or you are installing new hardware or software
and want to find out what types of problems others have experienced,
here is the place to find out.

Members are encouraged to bring ideas for future presentations and
speakers to this meeting.

--

Please check the WEB site for Map and Directions:
http://cavmen.home.comcast.net

In addition, you will also find extensive information available on
dining and lodging in the

Re: Mounting a filesystem *really* read-only

[van Sleeuwen, Berry]

Be aware that if you do use reserve/release you *MUST* set the DASD to
shared if you are running in multiple VM's. At the very least the one
where you put the lock file. If you don't you will get problems with
locking DASD devices. As we experienced with our VSE systems a few years
back. One of 4 VM's held the lock on the DASD containing the VSE lock
file preventing other VSE systems access to this DASD.

Regards, Berry.

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
ÿþDit bericht is vertrouwelijk en kan 
geheime informatie bevatten enkel

bestemd voor de geadresseerde. Indien 
dit bericht niet voor u is bestemd,

verzoeken wij u dit onmiddellijk aan 
ons te melden en het bericht te

vernietigen.

Aangezien de integriteit van het 
bericht niet veilig gesteld is middels

verzending via internet, kan Atos 
Origin niet aansprakelijk worden 
gehouden

voor de inhoud daarvan.

Hoewel wij ons inspannen een virusvrij 
netwerk te hanteren, geven

wij geen enkele garantie dat dit 
bericht virusvrij is, noch aanvaarden 
wij

enige aansprakelijkheid voor de 
mogelijke aanwezigheid van een virus in 
dit

bericht.

 

Op al onze rechtsverhoudingen, 
aanbiedingen en overeenkomsten 
waaronder

Atos Origin goederen en/of diensten 
levert zijn met uitsluiting van alle

andere voorwaarden de 
Leveringsvoorwaarden van Atos Origin 
van toepassing.

Deze worden u op aanvraag direct 
kosteloos toegezonden.

 

This e-mail and the documents attached 
are confidential and intended solely

for the addressee; it may also be 
privileged. If you receive this e-mail

in error, please notify the sender 
immediately and destroy it.

As its integrity cannot be secured on 
the Internet, the Atos Origin group

liability cannot be triggered for the 
message content. Although the

sender endeavours to maintain a 
computer virus-free network, the sender

does not warrant that this transmission 
is virus-free and will not be

liable for any damages resulting from 
any virus transmitted.

 

On all offers and agreements under 
which Atos Origin supplies goods and/or

services of whatever nature, the Terms 
of Delivery from Atos Origin

exclusively apply. 

The Terms of Delivery shall be promptly 
submitted to you on your request.

 

Atos Origin Nederland B.V. / Utrecht

KvK Utrecht 30132762

Re: Mounting a filesystem *really* read-only

[Carsten Otte]

Am Fri, 5 Jun 2009 16:47:15 -0700
schrieb Ted Rodriguez-Bell :
> Now I think we could work around this by changing the device to
> read-only before mounting, so you'd do something like this:
>   blockdev --setro /dev/dasdXX # Lock the device
>   if mount /dev/dasdXX /mount/point ; then
>  if [[ ! -f /mount/point/IN_USE ]]; then
>  SAFE_TO_MOUNT=yes
>  else
>  SAFE_TO_MOUNT='no, lock file exists'
>  fi
>   else
>  SAFE_TO_MOUNT='no, could not mount filesystem'
>   fi
>   blockdev --setrw /dev/dasdXX
> I've tested "blockdev --setro" and it *is* local; changing it on one
> machine doesn't change the filesystem on the other.
>
> But is there some other reason to think this might be unsafe?  Would
> Novell support be a better forum than this one?
Using a lock file on the filesystem looks racy to me. Did
you consider using the reserve/release feature for dasds for
this? In case of unexpected crash, you could break the lock
and recover the filesystem once you're sure the system that
was holding the lock has died indeed.

so long,
Carsten

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390