On 11/1/06, Phil Smith III [EMAIL PROTECTED] wrote:
To add to what others have said, don't forget the QUERY MDISK command -- if
LINUX123 has a problem with its 400 disk, QUERY MDISK USER LINUX123 400 DIR
LOCATION will tell him more than he wants to know about the disk.
And don't forget that
On 11/1/06, J Leslie Turriff [EMAIL PROTECTED] wrote:
I know that I'm probably in the minority here, but I like to use the
MDISK vdev 3390 DEVNO rdev md rp wp mp
statement, which allows one to map a volume's virtual address to its
real address as the DEDicate statement does, but makes it
On 10/31/06, McKown, John [EMAIL PROTECTED] wrote:
No, it is likely the same left-hander who wrote the COND processing in
the original OS/360 JCL. We are still stuck with that backwards logic.
Thankfully we now have IF THEN ELSE ENDIF in JCL.
Aren't you being a bit too hard on the poor soul
it was not designed to allow for sharing (and maybe did not
have all the stuff for reliability since it would be only that single
task to suffer when it breaks).
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switches. Quite often the real
test is to see how many other things you can do at the same time
without slowing down things. Obviously you're missing most of the
virtualization capabilities when you run Linux on zSeries without
z/VM. One of the things you miss is the instrumentation.
--
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On 10/25/06, Post, Mark K [EMAIL PROTECTED] wrote:
I would use the hcp command (from the cpint package), or the vmcp
command to query CP.
Alternatively, you might consider to make the link mode in the
directory M rather than MR so that you just don't get the disk when it
cannot be in write.
On 10/18/06, Paul Dembry [EMAIL PROTECTED] wrote:
My installation is SUSE 10 running on the Hercules S/390 emulator running on
RedHat. It all runs fine (rather slowly but it runs). I notice two things.
First even at idle, the CPU is burning through about a million
instrutions/sec. Also it's
On 10/14/06, Vic Cross [EMAIL PROTECTED] wrote:
Rob van der Heij wrote:
There's a system TOD that is set at POR time (from the clock of the
PS/2 or so?) Unless you have the gear that will synch that from true
time, it will be off some amount.
So does this provide our cheap-as-chips
%, the Linux guests didn't seem to notice any
problem.
Wondering whether CP might have paged out vital portions of CMS and
unable to get them in. Was the damage short enough (and the mondcss
large enough) for your performance monitor to still capture the data?
Rob
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On 10/12/06, [EMAIL PROTECTED] wrote:
Yes indeed. NTP is based on UTC which does not have time changes
:-) Technically, UTC does change due to the addition of leap seconds.
Since 1972 there have been 23 seconds added with the most recent added in
December of last year. The prior change was
against some set of
reference clocks makes your clock less stable than the zSeries clock.
Rob
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might need to spend more time reading (no pun intended).
Rob
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On 10/11/06, Alan Altmark [EMAIL PROTECTED] wrote:
From what I understand of the announcement, it appears to me this is
sort of the built-in version and uses other references than a dial-up
to Boulder. If that's correct, then z/VM and Linux would still be able
to take advantage in the same
On 10/11/06, Ingo Adlung [EMAIL PROTECTED] wrote:
We are working to provide ETR support asap, but currently this
anticipated support is limited to LPAR only, as z/VM doesn't provide
the required guest support, yet. STP will follow.
No doubt the lack of my imagination, but I think it would be
TOD clock is nice because it compensates the
drift for you. Combining ETR and NTP is not good because the model
behind ntpd does not match ETR.
Rob
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On 10/11/06, John Summerfield [EMAIL PROTECTED] wrote:
If the underlying hardware clock keeps good time, does the Linux clock
actually drift?
On zSeries, the Linux system clock was supposed to be locked to the
TOD (apart from the corrections by ntpd). That's because the TOD is
used to measure
On 10/12/06, John Summerfield [EMAIL PROTECTED] wrote:
I'm feeling a little slow; is the TOD set by the operator for each VM
guest? Or managed by VM? Or, (if you have one of these features) by the
underlying hardware?
There's a system TOD that is set at POR time (from the clock of the
PS/2 or
. Watch this
space.
Rob
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On 10/2/06, John Summerfield [EMAIL PROTECTED] wrote:
PVM3 (Parallel Virtual Machine) is a library and daemon that allows
distributed processing environments to be constructed on heterogeneous
machines and architectures.
How does this help when your network's down?
No, PVM == 5684-100
On 9/29/06, Romanowski, John (OFT) [EMAIL PROTECTED] wrote:
Has anyone implemented Rob van der Heij's idea about a read-only-dasd
rescue system that run's from ramdisk? I don't want to reinvent the
wheel if someone's documented how they did it.
We did not finish that work because we found in
, but it can be very
effective.
Rob
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the initrd (with the drivers) and
the root file system. But your skills in that area or probably better
than mine.
Rob
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the mkswap for you? I once suggested an enhancement
to DEF VDISK ... LIKE name where name is the a DCSS that has the
correct initial layout (because internally the structures are
similar). But I think the idea is on the big pile outside behind
building 250 in Endicott.
Rob
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storage for paging.
If you don't trust it, do your experiments and measure.
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On 9/28/06, David Boyes [EMAIL PROTECTED] wrote:
It'd be interesting to know how many of these sites apply similar
requirements to terminal servers attached to serial consoles. One could
make a fairly strong argument that that's exactly the role that VM plays
in this scenario.
It takes a
On 9/28/06, Brandon Darbro [EMAIL PROTECTED] wrote:
No, the entire point is to not have to tolerate 3270 at all, to also not
have a line mode in telnet. The entire point is to have a virtual
console device that is *completely* usable. Have it good for vi, screen
(terminal multiplexer),
On 9/28/06, Brandon Darbro [EMAIL PROTECTED] wrote:
Some shops, like mine, have what I call strategic division of labor.
I can't grab another VM's disks. z/VM is handled by the mainframe
group, and Linux is handled by my Unix group. And while I might get
granted such access, that makes me the
On 9/28/06, David Boyes [EMAIL PROTECTED] wrote:
1) Write them a quick cookbook man page detailing the steps to get a
guest back on the net -- call it zlinux-console -- and put it on one of
the Solaris or HP boxes. They can log in to their favorite environment
and type 'man zlinux-console', and
of finding a valid root
password.
And if you care about security, you should really get rid of passwords
completely and use cryptic keys instead.
Rob
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On 9/27/06, Little, Chris [EMAIL PROTECTED] wrote:
That really wouldn't work for our environment (at least). Operators
have the ability to logonby. The worst they could do would be a #cp
logoff.
Only limited by skills and/or imagination... Not that you would not
notice, but when you are
been discussed often on
the list in detail, but it might be easier to start reading the IBM
Redbook SG24-6926 http://www.redbooks.ibm.com/abstracts/sg246926.html
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Happy to see that in the latest SLES9 kernel, the hz_timer is now
off by default. It was so easy to miss that setting.
Rob
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that the virtual machine is not CPU constrained or suffering from
paging.
Rob
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out dirty pages.
Some algorithms and defaults still seem to be designed for desktops
where you need to retain interactive response over high I/O
throughput. Tuning disk I/O in a virtualized environment is not
trivial, and general recommendations that work is even harder.
Rob
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logon takes that long?
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the 4GB/hr into 1 MB/s and
meant to say that is too low to be happy with. But if you misconfigure
a system it is possible to get stuck at that rate.
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as well.
Rob
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On 9/22/06, Rich Smrcina [EMAIL PROTECTED] wrote:
Yes, that's weird. On the other hand the cvs server is one of my best
behaved virtual machines.
Marcy is lucky since she has the tools to diagnose this ;-)So
we'll have a look when she has time.
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On 9/20/06, John Summerfield [EMAIL PROTECTED] wrote:
ATI and nVidia video drivers have a certain reputation: I don't use
them, but it seems not all users of either are entirely happy.
I trust you did notice he was asking about Linux on z/VM... And even
on Intel platform I would hope the
that they can cache all their data
just-in-case, at least not as much as you would on discrete servers.
Rob
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/VM, the difference between desktop and server (or even
discrete server and virtual server) is way bigger than between SLES
and RHEL.
Rob
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hoped
for...
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On 9/7/06, Thomas Kern [EMAIL PROTECTED] wrote:
Is hcp/vmcp anymore sensitive in a class G (or less) linux service virtual
machine than 'shutdown -h now'? Does anyone really let untrusted users have
root access in production service virtual machines?
If the question is whether someone with
On 9/6/06, Romanowski, John (OFT) [EMAIL PROTECTED] wrote:
I don't want to use SECUSER and CP SEND, my Linux console isn't at a
shell prompt, it's at the Login: prompt.
You could change inittab and make sure there is a running shell at the
console.. And I suppose you don't want to use rexec
On 9/6/06, Christian Borntraeger [EMAIL PROTECTED] wrote:
Hotplug (or udev) gets triggered when you define/attach/detach a device.
Although it is not the nicest way of signalling, yes you could abuse hotplug
or udev to trigger an action (e.g. by defining a virtual ctc device and
intercepting
by servers
doing nothing or other things that could be avoided. That's sad when
you realize that you could have used that capacity to run your
business applications.
Rob
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On 8/30/06, McKown, John [EMAIL PROTECTED] wrote:
Now, nobody likes telnet and says to replace it with ssh. I agree. But
am I missing something in ssh that causes ssh to not warn about an
expiring password?
I recall reading the ssh authentication libraries don't have this
option. Would you be
On 8/30/06, McKown, John [EMAIL PROTECTED] wrote:
If I were doing this in a business environment, I would insist on
digital certs and not even allow the use of passwords (and disable
telnet as well, for that matter). That would only leave logging in via
the console under z/VM and/or the HMC
On 8/30/06, Hall, Ken (GTI) [EMAIL PROTECTED] wrote:
Yes, it does, and we haven't, although the performance folks use it extensively
on x86 Linux, and have great confidence in it.
Not unlikely that application exhausted the JVM heap and someone (or
something) jumped to conclusions seeing one
find a real life application that behaves more like my
synthetic benchmark, the recommendation may change again ;-)
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On 8/30/06, Alan Altmark [EMAIL PROTECTED] wrote:
Yeah, but you have an HD password, right? And you require authentication
to your OS?
I assume the password generator will reveal that password when you set
it? Even if you forget it immediately I think it is less secure than
not being able to
for these two JVMs.
Rob
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, and if you can steer that with the system wide
performance metrics from z/VM it can be very effective.
Rob
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that will inherit all
usage of the children. My experience is that often cron is the one to
create a child process and not hang out for it to terminate.
Rob
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. to invoke a shell) but the CGI process would normally
wait for its child to terminate while processing the output of the
child into the response for the request.
What I tried to say is that I would not expect init to inherit any
child processes during normal working of the web server.
Rob
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On 8/28/06, Carsten Otte [EMAIL PROTECTED] wrote:
I don't know what you mean by dynamic, but you can resize ext3
filesystems with resize2fs. There is also a patch that allows online
resizing of ext3 filesystems (that is, resizing while the filesystem
I hope this does not make you start
On 8/28/06, Carsten Otte [EMAIL PROTECTED] wrote:
see http://lwn.net/Articles/89560/
I may have branched relatively fast to conclusions, assuming that if
ext2 does not allow resizing while mounted, ext3 would not either.
The latest activity for ext2resize appears to be 2 years ago for a
. The resource usage of this child process in the previous
minutes was reported for the process itself. You might see this happen
for example when you stop some daemon process (part of the startup of
those services detaches it from the process that started it). So it is
just normal.
Rob
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On 8/10/06, Joseph Temple [EMAIL PROTECTED] wrote:
Can someone tell me how to exit the list while I am on vacation. I want to
set an away message and don't want to flood the list with junk.
send a note to [EMAIL PROTECTED] with a single line
set linux-390 nomail
is neat and helps for various things, but it does *not* help
you when you want to change the underlaying shared R/O file system one
you start using it.
Rob
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On 7/31/06, Rob van der Heij [EMAIL PROTECTED] wrote:
Yes, I did some time ago. I had to patch the kernel and need to see if
that already went into the real thing. There are some functional
problems that I ran into, but I have not found endian-ness things. I
promised a few folks to wrap-up
On 7/28/06, J Leslie Turriff [EMAIL PROTECTED] wrote:
I believe that this is also true of minidisks that use the DEVNO rdev
format.
DEVNO is the dedicate for when you know the device address and
possibly don't have a (unique) volser for the device.
Rob
Warning: another long post...
What we are looking for I think is software virtualization and it
just is not there yet.
It's about giving each participant the illusion that he has the entire
thing for himself, while under the covers you take advantage of the
architecture to use less resources
of
data to be held up.
The alternative (file level backup inside Linux) will fill the page
cache with meta data for the entire file system (rather than the
content that changed during backup). Which is worse depends on your
situation.
Rob
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http
compare the internal memory measurements in Linux with the
VM side to draw conclusions.
Rob
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. ;-)
Yeah, performance monitoring and capacity planning
Rob
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, backup the (now frozen) first R/W layer, and
then merge any updates during the backup back into the first R/W
layer. This is neat because it's file level, but there may be a
performance issue when files need to be copied up.
Rob
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On 7/24/06, Dominic Coulombe [EMAIL PROTECTED] wrote:
in *theory* you can do live backup of machines with journaled filesystems
(at least ext3) without any problem.
Stop dreaming. Not even in theory - at least not my theory.
Linux will repair filesystems from journal after recovering your
On 7/24/06, Carsten Otte [EMAIL PROTECTED] wrote:
Well, that is what the device-mapper snapshot target is for:
a) make a snapshot, which is very fast because it does not actually
copy data
b) use dd to copy the snapshot to a backup dasd while writing to the
original disk
c) destroy the snapshot
On 7/24/06, Dominic Coulombe [EMAIL PROTECTED] wrote:
I'm sorry, but we managed to do live backup of our systems without any
problem. We restored a lot of backup and all were recoverable without any
problem. Even when data was stored on LVM volumes.
You've been lucky. That sometimes
that IPLs from SCSI.
Might have made sense for Novell to be more specific rather that raise
this as a required fix related to this kernel. If have a feeling it
might pull a lot of other service in which non-SCSI folks otherwise
would not care about.
Rob
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http
On 7/24/06, Adam Thornton [EMAIL PROTECTED] wrote:
It strikes me that file-level backups are generally a lot easier to
work with, and use less archival media.
File level backup is great for oops backup when you erased a few
files and want them back. I am not sure whether you ever tried to
On 7/24/06, Stahr, Lea [EMAIL PROTECTED] wrote:
These are standard image systems that I can clone from a master and have
in production in 2 hours. But what if its not standard? Then I have
customizations that are lost.
Such an approach does require discipline to properly register what you
.
But is dasda indeed online? Is the device driver module loaded?
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it?
For n=2 that improvement was already with earlier releases. I have
read that discussion several times but the nice improvement was not
obvious to me.
Rob
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On 7/18/06, Jim Elliott [EMAIL PROTECTED]
[EMAIL PROTECTED] wrote:
There will be NO further 31-bit (32-bit) distros (the s390
versions) for the mainframe. IBM announced months ago that from
now on only patches for the s390x (64-bit) would be made
I believe you were corrected on this already
On 7/19/06, Carsten Otte [EMAIL PROTECTED] wrote:
When the folks in Boeblingen don't try compilation for s390
and don't test it on 32-bit anymore, we can expect some more problems
in that area. I have seen such things already with dependencies on new
hardware that can not be fully
is starting
this processes, I have a slight feeling they will also check their
presence already and act upon problems.
Rob
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On 7/11/06, Rick Troth [EMAIL PROTECTED] wrote:
Consider what Kris said about the '-i' flag on 'sudo'.
It appears there's no such flag in the sudo that I have with SuSE so I
can't tell.
I believe my approach with coding su for one command is similar in effect?
And even the auditing is as
server on the Linux
server.
Rob
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configuration files that you
may not all protect. IMHO letting people run this under sudo only
provides the illusion of security.
Rob
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you did
what, and sometimes why you did it. It also helps to educate
colleagues after you've been called in the middle of the night. I just
don't give much for restricting root access that way.
Rob
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the format used in the lastest Linux kernels use the new format
that only works on z/VM 5.2, whether your virtual machine is large or
small.
Rob
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system that could deal with this, we would have a pretty fast disk
device for shared data.
Rob
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On 6/22/06, John Summerfield [EMAIL PROTECTED] wrote:
I'd rather see a benchmark involving Oracle on the Z and the Java app on
the {pSeries,iSeries,Sun} and if you can find a decent Opteron box, that
too.
That would make sense.
And if it has to be all on zSeries, we learned that it does help
a wait by counting with very small steps). In that
case your measurement is not very useful this way.
Rob
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eating a big chunk
of memory as well. I would expect one of them sitting in E3 now and
then.
If you care to share some monitor data with me, we could validate
these assumptions.
Rob
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the covers to get hold of the disk. Very easy.
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with enough virtual processors. Whether the application is up to using
that is indeed another matter.
When DB2 is capable to use multiple CPUs and you think you are CPU
constrained, that may make sense if you don't need it on other virtual
machines.
Rob
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night trying to understand why file transfer would fail
after so many MB (eventually the data gets discarded and is seen as
corrupted disk).
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for the 2G constraint with earlier z/VM releases running large Linux
guests. For those installations it could be an advantage to migrate
back to a single LPAR (and avoid the trouble with linking from
different LPARs as well).
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not helpful in
getting management backing for your Linux project).
Rob
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their unused z/OS-test LPAR for Linux (which had access to
all production MVS packs). That is probably not a good idea because
Linux will see all the packs the LPAR can access. The dasd= parameter
provides no protection.
Rob
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at Velocity Software's educational facility in
Mountain View, California (Silicon Valley).
http://velocitysoftware.com/workshop.html; for details.
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in
Boeblingen to allow the PARM option to specify additional options. But
each time I have the kernel source handy I forget to look whether it
was already published...
Rob
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it
must be faster...
Rob
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IBM has no plans to make WAS CE available on Linux on System z.
I could see some value in potential hardware sales for IBM if peope
would be able to download and try WAS on System z.
Rob
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nor z/OS). Normally you'd use z/VM or z/OS
to capture PR/SM CPU usage numbers on LPAR level and use that for
capacity planning. If you only run Linux on the machine, this driver
allows you to capture that data from PR/SM.
Rob
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to the conclusion both
mini disk cache and CPU contention between the two virtual machines
explained the behaviour. Did you miss those posts?
Rob
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