Vsam extended addressability.

Discussion:

(too old to reply)

John Benik

2004-02-16 19:16:04 UTC

We are not an SMS shop, but lately I've been discussing with my storage
partners about what is needed for a vsam file to go beyond the 4gb limit.
I've told them that we only need to setup a dataclass, and not storage
class and storage groups. I have recently setup a new dataclass to try
this out, but it appears that they dataset may not be using extended
addressability even though in the define they specify the new dataclass.
Here are the error messages we are seeing when a repro is tried to the
dataset.

REPRO INFILE(INFILE) -
OUTFILE(OUTFILE) -
REUSE
IDC3302I ACTION ERROR ON *******.*******
IDC3351I ** VSAM I/O RETURN CODE IS 28 - RPLFDBWD = X'2908001C'
IDC31467I MAXIMUM ERROR LIMIT REACHED.

Something may be overriding the dataclass, but it shouldn't be. Please let
me know if you have any suggestions.

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Mark Thomen

2004-02-16 20:06:30 UTC

Permalink

Post by John Benik
We are not an SMS shop, but lately I've been discussing with my storage
partners about what is needed for a vsam file to go beyond the 4gb limit.
I've told them that we only need to setup a dataclass, and not storage
class and storage groups. I have recently setup a new dataclass to try
this out, but it appears that they dataset may not be using extended
addressability even though in the define they specify the new dataclass.
Here are the error messages we are seeing when a repro is tried to the
dataset.
REPRO INFILE(INFILE) -
OUTFILE(OUTFILE) -
REUSE
IDC3302I ACTION ERROR ON *******.*******
IDC3351I ** VSAM I/O RETURN CODE IS 28 - RPLFDBWD = X'2908001C'
IDC31467I MAXIMUM ERROR LIMIT REACHED.
Something may be overriding the dataclass, but it shouldn't be. Please

let

Post by John Benik
me know if you have any suggestions.

J***@ibm-main.bluecrossmn.com

2004-02-16 20:32:38 UTC

Permalink

This is very confusing, because all that is mentioned is dataclass, which
when using does not mean that the dataset is SMS managed. Dataclass is
used to define what a file looks like, and this is always invoked, sms or
not. My understanding is that I should be able to use dataclass only and
define the dataset with that datclass and it would be extended format. Let
me know if I have to define the dataset with a specific storage class to
take advantage of extended addressability.

John Benik
Blue Cross Blue Shield of Minnesota
Storage Administration and Performance
W. (651)-662-4955
P. (651)-610-5080

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J***@ibm-main.bluecrossmn.com

2004-02-16 20:23:43 UTC

Permalink

Post by John Benik
We are not an SMS shop, but lately I've been discussing with my storage
partners about what is needed for a vsam file to go beyond the 4gb

limit.

Post by John Benik
I've told them that we only need to setup a dataclass, and not storage
class and storage groups. I have recently setup a new dataclass to try
this out, but it appears that they dataset may not be using extended
addressability even though in the define they specify the new dataclass.
Here are the error messages we are seeing when a repro is tried to the
dataset.
REPRO INFILE(INFILE) -
OUTFILE(OUTFILE) -
REUSE
IDC3302I ACTION ERROR ON *******.*******
IDC3351I ** VSAM I/O RETURN CODE IS 28 - RPLFDBWD = X'2908001C'
IDC31467I MAXIMUM ERROR LIMIT REACHED.
Something may be overriding the dataclass, but it shouldn't be. Please

let

Post by John Benik
me know if you have any suggestions.

From "Using Data Sets" section "1.2.2.1.2 Allocating System-Managed Data
Sets":
:

"Allocating an Extended-Format Data Set. Extended format data sets must be
system-managed. The mechanism for requesting extended format is through
the
SMS data class DSNTYPE=EXT parameter and subparameters R (required) or P
(preferred). The storage administrator can specify R to ensure the data
set
is extended. Then, for VSAM data sets the storage administrator can set
the
Extended Addressability attribute to Y to request extended addressability.
"

and from "1.3.3.3 Extended-Format Data Sets":

"VSAM data sets must also be in extended-format to be eligible for the
following advanced functions:
Partial space release (PARTREL)
Candidate volume space
Extended addressability (>4 GB)
System-managed buffering (SMB) "
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please return it to the sender immediately and delete the original
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Peter Vander Woude

2004-02-16 20:39:55 UTC

Permalink

John,

From the DFSMS Introduction manual there is the following text
regarding Extended Addressability datasets:

<quote>
To allow VSAM data sets to contain more than 4 GB of data, DFSMS
supports
extended addressability for system-managed VSAM data sets allocated
as
extended format.

</quote>

This means that Extended Addressability datasets MUST be SMS managed.

Peter I. Vander Woude

Sr. Mainframe Engineer
Harris Teeter, Inc.
This is very confusing, because all that is mentioned is dataclass,
which
when using does not mean that the dataset is SMS managed. Dataclass
is
used to define what a file looks like, and this is always invoked, sms
or
not. My understanding is that I should be able to use dataclass only
and
define the dataset with that datclass and it would be extended format.
Let
me know if I have to define the dataset with a specific storage class
to
take advantage of extended addressability.

John Benik
Blue Cross Blue Shield of Minnesota
Storage Administration and Performance
W. (651)-662-4955
P. (651)-610-5080

The information contained in this communication may be confidential,
and is intended only for the use of the recipient(s) named above.
If the reader of this message is not the intended recipient, you
are hereby notified that any dissemination, distribution, or
copying of this communication, or any of its contents, is strictly
prohibited. If you have received this communication in error,
please return it to the sender immediately and delete the original
message and any copy of it from your computer system. If you have
any questions concerning this message, please contact the sender.

Unencrypted, unauthenticated Internet e-mail is inherently insecure.
Internet messages may be corrupted or incomplete, or may incorrectly
identify the sender.

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Mark Thomen

2004-02-16 21:39:12 UTC

Permalink

Post by J***@ibm-main.bluecrossmn.com
This is very confusing, because all that is mentioned is dataclass, which
when using does not mean that the dataset is SMS managed. Dataclass is
used to define what a file looks like, and this is always invoked, sms or
not. My understanding is that I should be able to use dataclass only and
define the dataset with that datclass and it would be extended format

J***@ibm-main.bluecrossmn.com

2004-02-16 21:57:59 UTC

Permalink

Thanks to all now I think I've got it.

John Benik
Blue Cross Blue Shield of Minnesota
Storage Administration and Performance
W. (651)-662-4955
P. (651)-610-5080

The information contained in this communication may be confidential,
and is intended only for the use of the recipient(s) named above.
If the reader of this message is not the intended recipient, you
are hereby notified that any dissemination, distribution, or
copying of this communication, or any of its contents, is strictly
prohibited. If you have received this communication in error,
please return it to the sender immediately and delete the original
message and any copy of it from your computer system. If you have
any questions concerning this message, please contact the sender.

Unencrypted, unauthenticated Internet e-mail is inherently insecure.
Internet messages may be corrupted or incomplete, or may incorrectly
identify the sender.

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For IBM-MAIN subscribe / signoff / archive access instructions,
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