VLAN support in SuSE zLinux

2004-06-24 Thread Arty Ecock
Hi,

   We're using the 802.1q VLAN support in SuSE zLinux over a VSWITCH.
Works great.  Yesterday, I tried to set up another guest with the same
VLAN support (same VLAN, too).  The packets exit the vlan interface and
hit the base interface, then exit to the VSWITCH.  Looks fine.  Packets
then arrive from the VSWITCH to the base interface, but they never make
it to the vlan interface.  I am pretty sure that I have set everything up
to use vlan-tagged frames only.  The VSWITCH is set up correctly, and the
guest has appropriate GRANTs defined.  I'm a little puzzled at this point.
Any ideas?

Cheers,
Arty

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z/Linux image cloning

2004-07-06 Thread Arty Ecock
Hi,

   I'm also looking into cloning z/Linux images.  I've been looking/using the
available basic techniques, but I keep running into a problem.  I suspect it
has something to do with initrd.

   If my boot disk is R/O, I receive these messages prior to init running:


Loading module dasd_fba_mod ...
Using /lib/modules/2.4.21-231-default/kernel/drivers/s390/block/dasd_fba_mod.o
dasd(fba): FBA  discipline initializing
dasd(fba): /dev/dasdb  ( 94:  4),[EMAIL PROTECTED]: 9336/10(CU:6310/80) 1024MB at(512 
B/b
lk)
dasd(fba): /dev/dasde  ( 94: 16),[EMAIL PROTECTED]: 9336/10(CU:6310/80) 9MB at(512 
B/blk)
 dasdb:CMS1/  LXSWAP(MDSK): dasdb1
 dasde:CMS1/  LXSWAP(MDSK): dasde1
dasd(fba): We are interested in: Dev 9336/00 @ CU 6310/00
dasd(fba): We are interested in: Dev 3370/00 @ CU 3880/00
dasd_erp(3990):  /dev/dasda  ( 94:  0),[EMAIL PROTECTED]: EXAMINE 24: Command Reject 
dete
cted - fatal error
dasd(eckd): Sense data:
dasd(eckd):device 0150 on irq 10: I/O status report:
dasd(eckd):in req: 00ebef00 CS: 0x00 DS: 0x02
dasd(eckd):Failing CCW: 00ebeff0
dasd(eckd):Sense(hex)  0- 7: 80 02 00 00 00 00 00 00
dasd(eckd):Sense(hex)  8-15: 00 00 00 00 00 00 00 00
dasd(eckd):Sense(hex) 16-23: 00 00 00 00 00 a2 0f 00
dasd(eckd):Sense(hex) 24-31: 00 00 40 e0 00 00 00 00
dasd(eckd):24 Byte: 0 MSG 0, no MSGb to SYSOP

dasd_erp(3990):  /dev/dasda  ( 94:  0),[EMAIL PROTECTED]: (EXAMINE) ERP chain report 
for
req: 00ebef00
dasd_erp(3990):  /dev/dasda  ( 94:  0),[EMAIL PROTECTED]: 00ebef00: c5c3d2c4 

  
dasd_erp(3990):  /dev/dasda  ( 94:  0),[EMAIL PROTECTED]: 00ebef10:  
00eb
ef00  00ebef00
dasd_erp(3990):  /dev/dasda  ( 94:  0),[EMAIL PROTECTED]: 00ebef20:  
00ef
7800  00ec0e00
dasd_erp(3990):  /dev/dasda  ( 94:  0),[EMAIL PROTECTED]: 00ebef30:  
00eb

...


   All the bind mounting and other magic happens *after* init runs.  It looks
like something is insisting that the boot disk be R/W during initrd.

   Any ideas?

Cheers,
Arty

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Re: Linux under VM and Cloning

2004-07-08 Thread Arty Ecock
Hi,

   I've found William Sculley's basevol/guestvol approach to be fairly
simple to set up.  It's too bad that I goofed somewhere, as I can't get
past my read-only root volume problems (with initrd).  If I can get past
this problem, the setup looks extremely promising (i.e., cloned images
would only need 150cyl R/W minidisks as a starting minimum).

   Has anyone else run into problems with R/O root disks?  Something in
initrd wants that disk R/W.  Adam suggested changing the parmline to
something like "DASD=150(ro), ..." but once that is done, you lose the
ability to update the basevol root disk (or a copy of it).

Many thanks,
Arty

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Re: LVM under Debian

2004-09-02 Thread Arty Ecock
Hi,

   I'd use: "vgdisplay -v lvmdata" and look for the "Total PE" value, and
then use "lvcreate --extents nn -n vol1 lvmdata", where "nn" was the
value from the "Total PE" display from vgdisplay.  This way, I get exactly
the size I want with no wasted space.

Cheers,
Arty

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Swapping indicators

2004-12-17 Thread Arty Ecock
Hi,

   I'm working on a rush, special project that needs to determine if swapping
has increased (as a result of doing something *interesting*).  The program is
written in Perl and so far, it looks at SwapFree and SwapTotal from
/proc/meminfo.  It computes a value of SwapUsed from these values and saves
this value as a baseline.  Later, the program does some *interesting* things
and needs to determine if swapping has increased.  So, it's off to
/proc/meminfo again, recalculate SwapUsed, compare against baseline, and
make an educated guess if any increased activity is the direct result of
the program's Linux alterations.  Yuch.

   Is there a "better way" to determine when swapping has increased?  Are
there other /proc files that might be useful?

   Trapping the output from vmstat for "si" and "so" values might be
interesting, but certainly not clean (I'd rather find these values directly
if I could).

Cheers,
Arty

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vmhalt=LOGOFF

2005-02-09 Thread Arty Ecock
Hi,

   I know I've seen this before, but is it vmpoff=LOGOFF that causes a SLES8
guest (with /etc/inittab properly configured for "ca") to LOGOFF when it
receives a SIGNAL SHUTDOWN?  Or is it vmhalt=LOGOFF?  I have both specified
and something's not working.

Thanks,
Arty

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Re: Does TurboLinux do PAM ?

2002-02-06 Thread Arty Ecock

Hi,

   Does TurboLinux support LDAP via /etc/nsswitch.conf?  I think Turbo
is missing a package that makes all this work nicely with PAM.  nss_ldap?

Cheers,
Arty



Re: RXSocket for REXX

2002-02-07 Thread Arty Ecock

On Thu, 7 Feb 2002 21:35:13 +0100 you said:
>Todd Blevins wrote:
>>
>> Has anyone "ported" the rxsocket function (for rexx) to linux?
>
>Doesn't IBM's Object REXX for Linux have socket support ?

Hi,

   Pierantonio Marchesini of CERN did a port, circa 1995 (!) to Regina.
This URL should help:  http://wwwinfo.cern.ch/regina/extention.html

   I lost touch with him, but his last contact information was:

  Pierantonio Marchesini C.E.R.N.
  ETH ZurichCH-1211 GENEVE 23
  email: [EMAIL PROTECTED] Phone: +41.22.767.50.23
 [EMAIL PROTECTED]

   Pierantonio made a few other nice additions to Regina.  The source
updates were in an AFS directory at CERN, but I never had a chance to
request the address.

   IBM's OREXX has socket support, but the syntax is different than
REXX/Sockets.  However, there was a little presentation (SHARE?) describing
how to do similar things using both packages.  I have the presentation
online, if anyone is interested.

Cheers,
Arty



R/O Linux guest?

2002-03-12 Thread Arty Ecock

Hi,

   I need to set up a Linux/390 guest with read-only file systems (and
minidisks).  Has anyone done anything like this?  I'd want to put the
portions of the file systems that MUST be read-write on a V-disk.

   My filesystems are all on separate minidisks:

   /
   /home
   /usr
   /opt
   /tmp
   /var
   swap

   I think I can make /usr, and /home read-only rather easily.  The same
with /opt.  For the others, I'd have to disect them to locate the files
that must be read-write and set up symlinks for them.  Am I on the right
track?

Cheers,
Arty



Re: Authentication on Linux using PAM to a z/OS RACF server

2002-03-19 Thread Arty Ecock

Hi,

On Tue, 19 Mar 2002 10:19:07 EST Jim Elliott said:
>> I didn't mean RACF, I meant DB2 under VM - there is no RACF involved
>
>Carlos: I was responding to Phil's question there. However, in looking
>at Neale Ferguson's port of LDAP to VM (it was the old UMich code), it
>does not appear to use any kind of external database.
>
>To get this to work on a z/VM base, someone would need to port OpenLDAP
>to the z/VM Open Extensions ("UNIX") environment.

  Why port OpenLDAP to z/VM OE?  Just leave it on a Linux Guest and
instrument the guest to talk to RACFVM (via CP Diagnose x'A0' or a
new API).

Cheers,
Arty



Re: send messages to vm console

2002-05-16 Thread Arty Ecock

Hi,

   You can use the logger command on Linux/390 and point the /etc/syslogd.conf
at your VM host.  You can then install my TCPLOGD server (on the 1997 VM Tools
Tape) and customize it to your heart's content.  The TCPLOGD "server" is a
REXX EXEC and a NAMES file.  That's it.  Piece of cake.

   I've always thought that PROP should be taught how to listen for SYSLOG
messages.  In fact, I think it probably can be done without mods (just run
something like TCPLOGD EXEC, with a few changes, in a background CMS process).
Might be quite fun.  If anyone has a ton of free time, I'll supply the tools.

Cheers,
Arty



Re: LINUX & Security

2002-12-11 Thread Arty Ecock
On Tue, 10 Dec 2002 15:06:39 -0500 David Boyes said:
>> If you are an ACF2 (or CA-Top Secret) customer, then we have an
>> open-source PAM plug-in that lets you authenticate directly
>> against ACF2
>> or Top Secret. The client side (the part that runs on Linux) is
>> available in source code or pre-built RPM form (both Intel
>> and mainframe
>> Linux). The server is simply a built-in integrated part of ACF2. With
>> our plug-in installed, you need no user definition on Linux - your
>> existing mainframe security rules and passwords are all
>> that's needed.
>
>Nice. Will it be available for VM:Secure?

How about RACF?

Cheers,
Arty



OT: New Mac G5

2003-10-30 Thread Arty Ecock
Hi,

   I'm considering replacing several existing development workstations
with a single G5 Mac.  The G5 would run Linux natively with the following
applications:

   - Mac-On-Linux (for running Panther and Jaguar)
   - Hercules (to replace my aging P/390)
   - Bochs or Wine (for running those few Windows 2000 apps that have no
 native Linux client)
   - I would *LOVE* to be able to boot AIX on this thing, but I have no idea
 if that is possible

   Has anyone any experience with the G5?  Any advice?

Cheers,
Arty

P.S. I'd load the G5 to the gills with RAM and DASD.


Re: Use of DIrmaint

2004-02-28 Thread Arty Ecock
Hi,

On Thu, 26 Feb 2004 17:29:57 -0500 David Boyes said:
>Problem is that it's not helpful if you don't have a C compiler and a lot of
>shops that are using VM only to support Linux aren't going to license the
>C/C++ compiler just to write management apps.

   Can those folks running z/VM and Linux on IFL engines even license the
IBM C/C++ compiler.

Cheers,
Arty


Using DCSS for extra memory

2004-03-02 Thread Arty Ecock
Hi,

   Many years ago, we created an application that would attach a R/W DCSS
to use for extra memory.  As the demands for more memory increased,
subsequent DCSS space would be attached.  We used to attach existing DCSS
space (such as VTAM) for testing (no, this would no trash the real VTAM
segment, we'd just ATTACH the DCSS in R/W mode, thus extending our virtual
machine storage dynamically).  I was wondering if Linux on 390 could be
taught how to do this.  Can Linux on 390 handle "holes" in it's address
space?

Cheers,
Arty


Re: VSWITCH and LINUX

2004-03-12 Thread Arty Ecock
Hi,

   Two other collective nouns for penguins are "waddle" and "raft".  A
"waddle" is a bunch of penguins on land, and is preferred over "rookery".
A "raft" is a group of penguins floating on the surface of water (where they
spend most of their time).

Cheers,
Arty

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Installing SLES8 31-bit on z990

2004-03-22 Thread Arty Ecock
Hi,

   I know I'm missing the obvious, but how do I force an install of a 31-bit
SLES8 on z z990 (running unver z/VM, of course)?

Cheers,
Arty

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gPXE for s390x?

2008-07-01 Thread Arty Ecock
Hi,

   I'm messing around with iscsi for a new project.  I didn't have an x86
machine handy, so I ran some tests using VM guests.  I found that RHEL 5.2
does not allow you to install to an iscsi target, and SLES10 SP1 installs
just fine.  Very nice.  So, how do I boot from it?  I assume I'd need to
network boot gPXE or something that will set up an iscsi initiator to talk
to my iscsi target.  Any ideas?  Is there a gPXE for s390x architecture?

   Our target systems for this project are a whack (tm) of x86 blade servers
with no support for iscsi boot (just PXE->gPXE chaining magic).

Cheers,
Arty

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Re: Cobbler anyone?

2008-07-16 Thread Arty Ecock
Hi,

   I've been looking at getting cobbler to run on s390x to serve as a
provisioning manager for x86 (and friends).  It installs without too much
fuss on RHEL 5.2.  Getting it to install on SLES10 SP2 looks far more
challenging.

   Our immediate need is for rapid x86 provisioning (we have the s390x
provisioning down to a science).

Cheers,
Arty

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LVM multipathing in SLES9

2005-06-24 Thread Arty Ecock
Hi,

   The "pvpath" command appears to have vanished in SLES9.  We use "pvpath"
and LVM multipathing for a dozen Linux guests running SLES8.  Using SLES9,
"pvcreate" works fine, but "vgcreate" complains about duplicate "PV"
identifiers (on the alternate path devices).  Although "vgcreate" indicates
that the volume group was sucessfully created, it isn't.

   I have 8 paths to each FCP LUN on an IBM ESS.  So, /dev/sd[b-h] are the
same devices as /dev/sda.  Works just fine under SLES8.  I am able to define
the LUN mapping in SLES9 using YaST2 LVM.  I just can't convince "vgcreate" to
do the right thing.

   Any ideas?

Thanks,
Arty

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Re: Bug fix in mksles9root

2005-07-22 Thread Arty Ecock
Hi,

   That SCSI underrun problem surfaced just after the 2.4 "-261" kernel level.
I have several "-261" guests using SCSI and they do not have the problem.
I have a guest at the "-281" level that has the problem, and I am certain that
at least 1 earlier level (than "-281") also exhibited the problem.  So,
somewhere between "-261" and "-281", the problem was introduced.

   Recent 2.4 kernels ("-292" SP4) still have the problem.  It has not been
fixed.

Cheers,
Arty

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Re: Cloning FCP-attached SCSI SLES9

2005-08-22 Thread Arty Ecock
Hi,

   I've been using /usr/lib/YaST2/bin/YaST2.firstboot from a VNC session after
cloning SLES9 images.  I build a master SLES9 image, apply service and any
generic packages, then I shutdown the image and clone.  When I bring up a
clone, it has the original hostname and IP address of the master.  These get
changed when I use firstboot from a VNC session.  A subsequent reboot, and
I'm ready to do another clone.

   I also use /usr/lib.YaST2/bin/YaST2.firstboot2 after I reboot the clone,
but I haven't verified if it is really needed.

   Using firstboot lets me use a supported mechanism for changing all the
values for a clone, without the guesswork.

Cheers,
Arty

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Re: 2005-10-04 Recommended Linux on zSeries code drop to developerWorks

2005-10-05 Thread Arty Ecock
Hi,

On Wed, 5 Oct 2005 10:59:50 +0200 Christian Borntraeger said:
>They differ in terms
>of response buffer handling(vmcp tells you if the buffer was too
>small by returning an error code instead of increasing the buffer
>and retry)

   That's really too bad.  Would an end-user have control over the size of
the buffer?  I hope not (that would be severely bad form).  Automatically
increasing the buffer size and retrying is "The Right Thing To Do".

   Why not adopt cpint and be done with it?  Why re-invent the wheel?

Cheers,
Arty

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Re: DIAG [was: 2005-10-04 Recommended Linux on zSeries ...]

2005-10-12 Thread Arty Ecock
Hi,

   If good IUCV support was available, *SPL would be rather cool.  It's better
than DIAG14 because it is a defined asynchronous interface.

   DIAG D8 might also be a fun addition to Linux.

Cheers,
Arty

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FCP LUNs on SLES9 SP3+

2006-03-19 Thread Arty Ecock
Hi,

   I have a need to add a great many FCP LUNs to a SLES9 guest.  Under SLES8,
it was a simple /etc/zfcp.conf file.  With SLES9, is it more than building a
bunch of /etc/sysconfig/hardware/hwcfg-zfcp-bus-ccw-0.0. files?  I'd
really, really, really hate to go through the YaST2 panels to do this.
Especially since I need to define 4 (or was it 8?) paths to each LUN.  I'd like
to adapt my existing zfcp.conf REXX EXEC to generate the hwcfg files instead.

Cheers,
Arty

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FCP LUNs on SLES9 SP3+

2006-03-20 Thread Arty Ecock
Hi,

   So it turns out, that if you use the YaST panels to add the zfcp driver,
then it is a simple matter of dropping a bunch of hwcfg configuration files
in /etc/sysconfig/hardware.  A simple REXX EXEC makes light work of generating
the hwcfg files (with 8 paths to each LUN!)  After a reboot, the LUNs are
found.

   The next step to save myself a lot of grief is to decipher the EVMS CLI
syntax and create a shell script to batch-define the EVMS objects.

Cheers,
Arty

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Re: Implementing zFCP & Multipathing on existing SLES9 SP3 with ECKD/LVM ...

2006-06-06 Thread Arty Ecock
On Tue, 6 Jun 2006 12:33:35 -0400 Terry Spaulding said:
>Has anyone been able to have a coexistence with ECKD LVM non Multipathing
>and SCSi with LVM Multipathing ?

   We use ECKD (non-LVM) and SCSI (LVM Multipathing) by changing /etc/evms.conf
as follows:

- Under "legacy_devices", remove "dasd?" from "include = ..." and add
"dasd*" to "exclude = ..."
- Under "sysfs_devices", add "dasd*" to "exclude = ..."

  I would expect that you would only need to do our second change to evms.conf
in order to use ECKD (LVM non-multipathing) and SCSI (LVM Multipathing).  But
that's just a guess.  We only use LVM with SCSI.  And we always multipath SCSI.

Cheers,
Arty

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NED

2006-07-07 Thread Arty Ecock
Hi,

   Has anyone thought of adding a DIAG58 driver to ned?  It would remove the
TERMINAL CONMODE 3270 requirement.

Cheers,
Arty

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/dev/random

2006-08-21 Thread Arty Ecock
Hi,

   I tried to use gpg today to generate a pgp key on SLES9x.  The process
hangs while reading from /dev/random (which is lacking entropy).  Hasn't
this whole /dev/random (and /dev/urandom) thing been beaten to death?  Does
anyone else use gpg on s390x?

Cheers,
Arty

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Re: /dev/random

2006-08-21 Thread Arty Ecock
Hi,

On Mon, 21 Aug 2006 18:58:38 -0400 Post, Mark K said:
>Not specifically, but I just checked one of my SLES9 SP3 s390x systems:
># cat /proc/sys/kernel/random/entropy_avail
>2944
>
>My system is fairly idle.  What are you running on your system?=20

   My guest is very very idle.  The z990 is somewhat large.

   entropy_avail = 355

Cheers,
Arty

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Re: Best Swap Disk Strategy?

2006-09-29 Thread Arty Ecock
Hi,

On Fri, 29 Sep 2006 16:35:30 -0500 Mark Wheeler said:
>
>I have 5.2 GB of vdisk allocated to 30 servers.

   We have about 50G of vdisk allocated to 50 or so servers.  I've completely
removed the cap on vdisk allocation.

   We've also had great success using cmm to "hide" much of a server's
memory, and dynamically adjusting the memory size based on swapping pressure.
Yeah, we could DEFINE STORAGE and re-IPL, but why take an outage?

   Then again, z/VM 5.2 has completely spoiled us and we no longer fear very
large virtual machine sizes.

Cheers,
Arty

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Installing SLES9 to multipathed FCP SCSI

2006-10-18 Thread Arty Ecock
Hi,

I've been trying to install SLES9 to a multipathed FCP SCSI LUN.  I can
figure out how to get the 4 paths defined, and I can get SLES9 installed
without multipathing.  I normally use evms for FCP SCSI path multipathing,
but I can't figure out how to get evms to add the requisite regions during
the install process.  I'd hate to have to pre-build the evms segments prior
to the install process.

Anyone have any clues?

Cheers,
Arty

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getgroups for root

2007-03-20 Thread Arty Ecock
Hi,

   I'm running into a strange problem with SLES9.  We are doing a TIM/TAM
rollout and a software component (MQ) is complaining during startup.  It seems
that the user that runs the start script (root, during boot in our case) does
not appear to be in the mqm group.  An "id" command issued from the 3215
console confirms.  A "cat /etc/groups" contradicts, as does a "sudo id".  If
we run the start script from an ssh session, it works (as does the "id"
command).

   It turns out that "login" might be the culprit, as it only sets the primary
group if the uid is 0.  I tried removing minigetty from /etc/inittab, and tried
"sulogin", Rick's suloginv script, and /bin/sh all to no avail.  I really don't
mind login's behaviour, but the rc scripts run before login, so shouldn't
root's list of auxiliary groups be set by getgroups properly during boot?

Cheers,
Arty

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Re: getgroups for root

2007-03-27 Thread Arty Ecock
(whoops, replied off-list)

Hi John,

mingetty on the 3215 console runs through "login".  $HOME is set, as
other environment variablesb, but "id" still behaves oddly.

For the rc script case, I would not assume any settings from "login",
I did assume that "getgroups" had been issued for root.

Cheers,
Arty

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Re: AF_IUCV support

2007-03-30 Thread Arty Ecock
Hi,

On Wed, 28 Mar 2007 22:32:23 -0400 David Boyes said:
>> So how about if you make the calls to the ACI stubs nice CP exits so
>> that we can dynamically load the modules that RACF (or someone else)
>> supplies.
>
   For what its worth, our home-brew SECURE system is implemented as a
CPXLOADable IUCV System Service.  The dynamic IUCV System Service code is a
local CP modification, but wouldn't be needed if *RPI spoke to CP exits.

   In any event, CPXLOADable security code works.  Well.

Cheers,
Arty

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SLES9 and EVMS

2007-08-06 Thread Arty Ecock
Hi,

   We use EVMS on SLES9X to handle our scsi multipathing needs.  We pretty much
use the procedure documented in SG24-6344 Linux for zSeries: Fibre Channel
Protocol Implementation Guide, page 192-234.  We have 4 paths defined for each
LUN.  We had a failure on our SAN Volume Controller this weekend that caused
EVMS to lose 2 disks (child objects).  These 2 disks represent 2 of 4 paths to
the same LUN.  EVMS complains that the disk count in the "region" is wrong (ok,
we lost 2 disks), but it won't continue without the missing disks (even though
these disks were defined in EVMS as being redundant paths to the same LUN).

   It seems odd that EVMS would work this way.  Would anyone know how to "fool"
EVMS into working with missing child objects?  Shouldn't EVMS handle path
failures?

   Novell tells me that multipathing with EVMS is not a supported
configuration.  I thought it was supported for non-root volumes.

Sigh,
Arty

(35 dead penguins)

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