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Guide PeopleSoft V8 on zSeries Using Sysplex Data Sharing and Enterprise Storage Systems

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Patterns: service-oriented architecture and web services IBM Redbooks. As the numbers of user data sets and system data sets grow, so do the catalogs that these data sets use. As a result of using a single request for each catalog access request, sharing a large catalog across multiple systems often encounters large GRS ENQ contentions or conflicts over the major name SYSIGGV2 the minor name is typically the name of the individual catalog being accessed.

The enqueue wait time significantly impacts the performance of any large catalogs, particularly during batch windows where batch jobs often require obtaining SYSIGGV2 ENQ in exclusive mode to update records in these catalogs.

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In order to try to accommodate for these issues, large catalogs most susceptible to experiencing large wait times have been split into smaller catalogs with different catalog names. However, splitting large catalogs into smaller catalogs is time consuming and negatively impacts availability.


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Accordingly, anything that can avoid this disruptive activity while also avoiding the long enqueue wait times for accessing large catalogs would be beneficial. In one embodiment, a data storage system includes a server system having a processor and a local buffer pool for storing instances for use in catalog requests, and a direct access storage device DASD subsystem electrically coupled to the server system and to at least one DASD, wherein the at least one DASD includes an integrated catalog facility ICF adapted for providing at least one catalog configured according to a basic catalog structure BCS and a virtual storage access method VSAM volume data set VVDS , wherein the at least one catalog includes at least one of a user catalog including information related to locations of user data sets and system data sets stored to the at least one DASD, and a tape volume catalog including information related to locations of user data sets and system data sets stored to at least one tape medium, and wherein the data storage system is adapted for providing record level sharing RLS for the at least one catalog stored to the at least one DASD.

In yet another embodiment, a computer program product includes a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code including computer readable program code configured to receive a request to open a file directory, wherein the file directory is stored on a DASD and includes at least one of: a directory including information related to locations of files stored to the DASD and a tape volume directory including information related to locations of files stored to a tape medium, computer readable program code configured to receive a key associated with a record in the file directory, wherein the record in the file directory corresponds to at least one file stored to either the DASD or the tape medium, and computer readable program code configured to cause the record in the file directory to be locked.

According to another embodiment, a method includes receiving a first request to open a VSAM catalog, wherein the catalog includes at least one of: a user catalog including information related to locations of data sets stored to a DASD and a tape volume catalog including information related to locations of user data sets and system data sets stored to a tape medium, receiving indication of a first record in the catalog, wherein the first record in the catalog corresponds to at least one first data set stored to either the DASD or the tape medium, causing the first record in the catalog to be locked, receiving a second request to open the catalog, receiving indication of a second record in the catalog, wherein the second record in the catalog corresponds to at least one second data set stored to either the DASD or the tape medium, and causing the second record in the catalog to be locked contemporaneous with the first record in the catalog being locked.

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Other aspects and embodiments of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention. The following description is made for the purpose of illustrating the general principles of the present invention and is not meant to limit the inventive concepts claimed herein.

Further, particular features described herein can be used in combination with other described features in each of the various possible combinations and permutations. RLS provides full read and write integrity at the record level to any number of users in a parallel sysplex comprising multiple systems. In one general embodiment, a data storage system includes a server system having a processor and a local buffer pool for storing instances for use in catalog requests, and a direct access storage device DASD subsystem electrically coupled to the server system and to at least one DASD, wherein the at least one DASD includes an integrated catalog facility ICF adapted for providing at least one catalog configured according to a BCS and a VSAM volume data set VVDS , wherein the at least one catalog includes at least one of: a user catalog including information related to locations of user data sets and system data sets stored to the at least one DASD, and a tape volume catalog including information related to locations of user data sets and system data sets stored to at least one tape medium, and wherein the data storage system is adapted for providing RLS for the at least one catalog stored to the at least one DASD.

In yet another general embodiment, a computer program product includes a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code including computer readable program code configured to receive a request to open a file directory, wherein the file directory is stored on a DASD and includes at least one of: a directory including information related to locations of files stored to the DASD and a tape volume directory including information related to locations of files stored to a tape medium, computer readable program code configured to receive a key associated with a record in the file directory, wherein the record in the file directory corresponds to at least one file stored to either the DASD or the tape medium, and computer readable program code configured to cause the record in the file directory to be locked.

According to another general embodiment, a method includes receiving a first request to open a VSAM catalog, wherein the catalog includes at least one of: a user catalog including information related to locations of data sets stored to a DASD and a tape volume catalog including information related to locations of user data sets and system data sets stored to a tape medium, receiving indication of a first record in the catalog, wherein the first record in the catalog corresponds to at least one first data set stored to either the DASD or the tape medium, causing the first record in the catalog to be locked, receiving a second request to open the catalog, receiving indication of a second record in the catalog, wherein the second record in the catalog corresponds to at least one second data set stored to either the DASD or the tape medium, and causing the second record in the catalog to be locked contemporaneous with the first record in the catalog being locked.

As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or computer program product. Accordingly, aspects of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment including firmware, resident software, micro-code, etc. Any combination of one or more computer readable medium s may be utilized. The computer readable medium may be a computer readable signal medium or a non-transitory computer readable storage medium.

A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples a non-exhaustive list of the computer readable storage medium include the following: a portable computer diskette, a hard disk, a random access memory RAM , a read-only memory ROM , an erasable programmable read-only memory EPROM or Flash memory , a portable compact disc read-only memory CD-ROM , a Blu-ray disc read-only memory BD-ROM , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

In the context of this document, a computer readable storage medium may be any tangible medium that is capable of containing, or storing a program or application for use by or in connection with an instruction execution system, apparatus, or device. A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof.

A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device, such as an electrical connection having one or more wires, an optical fibre, etc.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fibre cable, RF, etc. The program code may execute entirely on a user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. As shown in FIG.

A gateway may be coupled between the remote networks and a proximate network In the context of the present network architecture , the networks , may each take any form including, but not limited to a LAN, a WAN such as the Internet, public switched telephone network PSTN , internal telephone network, etc.

In use, the gateway serves as an entrance point from the remote networks to the proximate network As such, the gateway may function as a router, which is capable of directing a given packet of data that arrives at the gateway , and a switch, which furnishes the actual path in and out of the gateway for a given packet. Further included is at least one data server coupled to the proximate network , and which is accessible from the remote networks via the gateway Coupled to each data server is a plurality of user devices It should be noted that a user device may also be directly coupled to any of the networks, in some embodiments.

A peripheral or series of peripherals , e. In the context of the present description, a network element may refer to any component of a network. Cloud computing typically involves an Internet connection between the systems operating in the cloud, but other techniques of connecting the systems may also be used, as known in the art.

The workstation shown in FIG. It will be appreciated that a preferred embodiment may also be implemented on platforms and operating systems other than those mentioned. Object oriented programming OOP , which has become increasingly used to develop complex applications, may be used. Referring now to FIG. As shown, the data storage system comprises at least one server system , at least one coupling facility electrically coupled to the at least one server system , and a direct access storage device DASD subsystem electrically coupled to the at least one server system and to at least one DASD Both the RLS lock and the default lock are global locking mechanisms capable of locking records across multiple systems.

The RLS cache comprises memory for the storage of catalog data and is used by VSAM for registering the catalog data for purposes of invalidation across all catalog storage pools. Each server system may comprise a processor for executing computer readable program code an example of which is provided in FIG. In addition, the data storage system is adapted for providing RLS for the at least one catalog stored to the at least one DASD Each server system may also comprise a dataspace for storing and modifying data, which may have its own buffer pool, as shown in FIG.

This buffer pool may be a 31 bit buffer pool, according to one embodiment. Any of the server systems System 1. Furthermore, the processor of each server system may comprise one or more suitable processors, such as a central processing unit CPU , a field programmable gate array FPGA , a microprocessor, an integrated circuit IC , an application specific integrated circuit ASIC , etc. According to one embodiment, the coupling facility may include a RLS cache adapted for storing instances for use in catalog requests and a RLS lock adapted for causing one or more records to be locked within the at least one catalog without locking all records within the at least one catalog during catalog requests.

In more embodiments, the server system may be further adapted for receiving multiple catalog requests contemporaneously and providing access to different portions of the at least one catalog in response to the multiple catalog requests. This may be achievable by locking the catalog on a record level, rather than locking the entire catalog, as is in conventional systems.

In a more generally applicable embodiment, a system may comprise a computer readable storage medium such as a RLS cache, buffer pool, etc. The new parameters are also provided to indicate an initial type of access to be used e.

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US8996801B2 - Providing record level sharing (RLS) to individual catalogs - Google Patents

However, catalogs accessed by RLS at the time of the delete will be closed sysplex wide prior to the delete. These commands may include:. The commands may be issued from one system or image in a sysplex comprising multiple systems , and results in sysplex wide enable or quiesce of the specified catalogs, e.


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Furthermore, no catalog requests fail as a result of the enable or quiesce, according to the embodiment described herein. In this situation, U may be used to indicate that RLS is enabled e.


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Now referring to FIG. The method may be performed in accordance with the present invention in any of the environments depicted in FIGS. Of course, more or less operations than those specifically described in FIG. Each of the steps of the method may be performed by any suitable component of the operating environment. Optional operations described below are those operations which may be omitted, may be performed once while other operations are performed multiple times or vice versa, may be performed by other entities or systems and relied upon by other operations, etc. The catalog is stored on a DASD or some other readily accessed storage device and comprises at least one of: a user catalog comprising information related to locations of data sets stored to the DASD, and a tape volume catalog comprising information related to locations of data sets stored to a tape medium.

Because data sets are stored to tape medium sequentially, it typically takes longer to access data sets on tape medium, and therefore it is not a preferred storage medium for the catalog. However, in some approaches, a catalog may be stored to the tape medium, or possibly to a direct access cache of the tape cartridge, such as Flash memory, RAM, etc.

Of course, multiple data sets, both user and system, may be stored to any storage medium. In operation , a key associated with a record in the catalog is received.

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The record in the catalog corresponds to at least one data set stored to either the DASD or the tape medium. Since the catalog is a collection of information about locations of data sets, each record in the catalog corresponds to a data set stored to some storage medium. Therefore, in one approach, in order to access the appropriate record in the catalog, a key for the record is provided to identify the appropriate record in the catalog.

In one approach, the key may be a name of the record in the catalog, which may be an alphanumeric code in a further approach. Of course, in other embodiments, some identification other than a key may be used, such as having a pointer that directs to the record, a hyperlink, etc. In operation , the record in the catalog is caused to be locked. If the catalog is stored to a local device, then the record may be locked by the system executing method