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sijayapal
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Joined: 23 Dec 2008
Posts: 69
Location: India
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Hi,
There are different kinds of storage class being used. There is a storage class and Data class called TMMFAST.
Does anyone have any idea regarding this parameter?
If so pls share it with me.. it would be really helpful for me. |
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enrico-sorichetti
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Joined: 14 Mar 2007
Posts: 10873
Location: italy
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SMS naming convention are site/organization dependent
the best source of info is Your storage support or Your standards manuals |
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Anuj Dhawan
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Joined: 22 Apr 2006
Posts: 6250
Location: Mumbai, India
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| The DATACLAS parameter provides the data class to be used for a sequential data set, a PDS, or a VSAM data set that you are creating. The class name must be one of those pre-established by the storage administrator at your site -- so TMMFAST has no meaning at my site, you need to get in touch with storage admin at your shop or try allocating a DSN with dataclas in question... |
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expat
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Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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But as it's psychic day today 
I should imagine that it has something to do with TMM - which is where SMS intercepts tape dataset allocations and routes them to DASD instead, usually a DASD pool which has interval migration turned on.
But I could be wrong. |
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sijayapal
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Joined: 23 Dec 2008
Posts: 69
Location: India
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Hey expact i believe u r almost there....
What i analysed is.. the files created with this data class gets migrated soon than other data class. Also there is a chance of performance improvement when this class is used. |
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expat
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Location: Welsh Wales
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| Actually, it is the MGMTCLAS that determines the migration criteria for the datasets rather than the DATACLAS or STORCLAS. |
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sijayapal
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Joined: 23 Dec 2008
Posts: 69
Location: India
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| Is there any document explaining the storage management concepts in mainframe? Where can i find it? |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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Click HERE to start learning the very basics of DFSMSsms.
And then you need to chase and read the documentation for any other storage products in site for exampleDFSMShsm, OAM, RMM, ad infinitum. |
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sijayapal
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Joined: 23 Dec 2008
Posts: 69
Location: India
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What is sustained data rate.
What will happen if sustained Data Rate is 64 and when it is 0.
Will the perfromance vary for both the case?
If so, then which case will be more effecient? |
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