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List:       linux-390
Subject:    Re: Find LUN (zfcp) in use from z/VM?
From:       Michael MacIsaac <mike99mac () gmail ! com>
Date:       2015-05-12 10:53:31
Message-ID: CAPSegDOOvbXtO9ZK1T60+DkSeWTxYo4G8qGHCiaS2WhTtxHY1A () mail ! gmail ! com
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>> Same issue as ECKD. An OS cannot tell what other OSes/LPARs have
>> access to an ECKD dasd volume. ...

> Well, it can to an extent [1][2]:

Here's an example of QUERY DASD DETAILS where the first DASD hardware does
not have 'Query Host Access'. The second does and it shows that 10 LPARs
have access:

==> *q da details 189d*
189D  CUTYPE = 2107-E8, DEVTYPE = 3390-0C, VOLSER = FDR3VM, CYLS = 10017
      CACHE DETAILS:  CACHE NVS CFW DFW PINNED CONCOPY
           -SUBSYSTEM   Y    Y   Y   -    N       N
              -DEVICE   Y    -   -   Y    N       N
      DEVICE DETAILS: CCA = 5D, DDC = --, SS = 0
      DUPLEX DETAILS: --
      CU DETAILS: SSID = 9002, CUNUM = 9002
==> *q da details 047c*
047C  CUTYPE = 2107-E8, DEVTYPE = 3390-0C, VOLSER = VM189D, CYLS = 10017
      CACHE DETAILS:  CACHE NVS CFW DFW PINNED CONCOPY
           -SUBSYSTEM   Y    Y   Y   -    N       N
              -DEVICE   Y    -   -   Y    N       N
      DEVICE DETAILS: CCA = 80, DDC = --, SS = 0
      DUPLEX DETAILS: --
      HYPERPAV DETAILS: BASE VOLUME IN POOL 1
      CU DETAILS: SSID = 8101, CUNUM = 8101











*      HOST ACCESS: CPU  PARTITION GROUPED RESERVED
MPATHMODE                   9999    09        N       N
N                   9999    04        Y       N         Y
9999    05        N       N         N                   9999    02
N       N         N                   9999    07        N       N
N                   9999    01        N       N         N
9999    06        Y       N         Y           -LOCAL  9999    0B
Y       N         Y                   9999    0C        Y       N
Y                   9999    0A        N       N         N*
    -Mike M

On Tue, May 12, 2015 at 6:27 AM, Peter Oberparleiter <
oberpar@linux.vnet.ibm.com> wrote:

> On 11.05.2015 22:08, Alan Altmark wrote:
> > On Monday, 05/11/2015 at 02:57 EDT, "Nix, Robert P." <
> Nix.Robert@mayo.edu>
> > wrote:
> >> Plus, even if you could find out if other zVM guests had access to the
> >> LUN, that would not tell you what other systems, outside of this zVM
> > (I.E.
> >> On other zVM šs, or on Intel or PowerPC systems, Linux or Windows, or
> > even
> >> Solaris or AIX?) had access to the LUN.
> >
> > Same issue as ECKD.  An OS cannot tell what other OSes/LPARs have access
> > to an ECKD dasd volume.
>
> Well, it can to an extent [1][2]:
>
>    Query Host Access is a new DS8000 function that reports all LPARs
>    that have established a Path Group Id on a volume, whether in the
>    grouped state or not.  z/VM now offers support to query the CPU
>    Serial Number and LPAR ID associated with all LPARs that have
>    established a Path Group Id to a volume, allowing one to determine
>    all LPARs with access to a volume.
>
> [1] http://www-01.ibm.com/support/docview.wss?uid=isg1VM65322
> [2] http://www-01.ibm.com/support/docview.wss?uid=isg1OA40720
>
> >  We simply ignore the issue and put the burden on
> > the "hardware people" to limit access.  We're lucky in that we generally
> > trust the accessing systems.  A naive trust, perhaps, but still....
> >
> > My issue is that I don't understand the job of the SAN storage
> > administrator well enough to judge how hard is is to implement strict
> > zoning and LUN masking rules.   They have orders of magnitude more
> devices
> > to deal with.
> >
> > Alan Altmark
> >
> > Senior Managing z/VM and Linux Consultant
> > Lab Services System z Delivery Practice
> > IBM Systems & Technology Group
> > ibm.com/systems/services/labservices
> > office: 607.429.3323
> > mobile; 607.321.7556
> > Alan_Altmark@us.ibm.com
> > IBM Endicott
>
>
> Regards,
>   Peter Oberparleiter
>
> --
> Peter Oberparleiter
> Linux on z Systems Development - IBM Germany
>
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