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Deepa.m
Warnings : 1

New User

Joined: 28 Apr 2005
Posts: 99

 Posted: Thu May 19, 2005 6:06 pm    Post subject: maximum records calculation How to calculate the maximum records the PS can store using the space parameter. ex: SPACE(150,(100,30)) what will be the maximum records that it can hold. what is default for AVGREC.is it units or kilobytes?

MGIndaco

Active User

Joined: 10 Mar 2005
Posts: 432
Location: Milan, Italy

 Posted: Thu May 19, 2005 7:07 pm    Post subject: Try to see this topic: http://ibmmainframes.com/viewtopic.php?t=1683&highlight=average Or access to IBM manual and see example 6: http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/iea2b650/12.55.6?SHELF=&DT=20040712170508&CASE=
Deepa.m
Warnings : 1

New User

Joined: 28 Apr 2005
Posts: 99

 Posted: Tue May 24, 2005 11:30 am    Post subject: I want to know the formula to calculate the maximum records for the given example SPACE(150,(100,30)) Can anyon e provide the same.
Deepa.m
Warnings : 1

New User

Joined: 28 Apr 2005
Posts: 99

 Posted: Wed May 25, 2005 2:24 pm    Post subject: any updates?
Deepa.m
Warnings : 1

New User

Joined: 28 Apr 2005
Posts: 99

 Posted: Wed May 25, 2005 2:28 pm    Post subject: I was not able to browse the link you provided..Just had a look at example 6. This is what i want to know..Thanks MGIndaco
vidyasaraswathi

New User

Joined: 10 May 2005
Posts: 72

 Posted: Wed May 25, 2005 8:15 pm    Post subject: Re: maximum records calculation Here is some information: ------------------------------------------- SPACE(trk,(100,30)) : This results in a primary allocation of 100 tracks and up to 15 extents of 30 tracks maximum each. The maximum space that could be allocated is:100 + (30 * 15) = 550 tracks. TRK - specifies that space is to be allocated by tracks. 1 track on 3390 disk storage equals 56,664 bytes. Based on this, you can calculate the max no of bytes = 56,664 * 550 Also consider the following example: // DCB=(LRECL=80,BLKSIZE=9040,RECFM=FB) Here No of Records= 9040/80 = 113 LRECL=x - specifies the record length of the stored data in bytes. LRECL=80 indicates a logical record length of 80 bytes. For variable-length records, LRECL indicates a maximum record length. BLKSIZE=y - specifies the physical block length of the data in bytes. For fixed-record length records, 'y' must be a multiple of the LRECL value 'x'. The maximum blocksize allowed on 3390 disk storage is 28,332 (1/2 track) but a maximum of 28,000 is recommended. Thanks and Regard, Vidya Bhat
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