Processing Multi-Volume Files on Disk

To process multi-volume files on disk# at least two disk packs with different volume serial numbers are needed. The maximum number of disk packs is not limited. Since the file-to-file utility programs process only sequential disk files, the disk packs may be processed on-line (disk packs are mounted simultaneously on different disk drives and processed one after the other) or off-line (after a disk pack has been processed a halt occurs, the old pack is removed, and the new one is mounted on the same drive), or both on-line and off-line.

As a rule# off-line processing is not possible with the disk drive to which the symbolic device address SYSRES has been assigned, since the utility program needs the label information stored on SYSRES via the job-control program.

If you want to process multi-volume files on one disk drive, the label informa-tion on each disk pack has to be identical.

The job can be run by means of the card-resident system; if you use the

disk-resident system, at least the first and the last disk pack must be a system disk pack.

Whenever you want to process multi-volume files, you only have to provide the label information via XTENT statements supplied with the job-control statements

(See Appendix A).

On-line processing

Figure 47 shows several examples of how to prepare the job-control statements for multi-volume processing when using four disk drives on-line. The first job

(CLRDSK) clears the tracks of four disk packs with the volume serial numbers PAYRL1 through PAYRL4 (as specified in the XTENT statements). Only the volume serial number of the first volume to be processed has to be s·tated in the DLAB statement, since the volume sequence number will automatically be increased by the utility program when the disk packs are changed.

With the second job (CARDSK) first all specified extents on SYSOPT (disk drive 1) are filled with data# then those on SYS002 (disk drive 2), and so on until all data is stored on disk or the specified extents are completely filled.

The third job (DSKDSK) transfers data on four disk packs to different extents on the same packs. Here again data is processed in the sequence of the specified XTENT st.atements.

The symbolic device addresses

SYS002-SYS004 need only be assigned if the disk drives are actually being used.

However, i t is not possible to have an extent on SYS004 without having assigned SYS002 and SYS003 to disk drives. The same applies to SYS005-SYS007 if the DSKDSK program is used. You can process the disk packs in any order, i.e.# you may specify an extent on the disk pack mounted on SYS003 and afterwards another on SYSOPT or SYSIPT, respectively.

Off-line processing

If i t is necessary to process a multi-volume multi-volume, sequentially organized file consisting of more disk packs than disk drives are attached to the system, the disk packs must be changed during processing.

Figure 48 gives an example of how to fill in the job-control statements for this problem. Here only one disk drive is necessary; each time the program reaches the end of all extents of the appropriate disk pack i t tries to open the extents on the next disk pack of the same drive.

Since the volume serial number does not agree, the program comes to a halt indicat-ing that the volume serial number does not match with the volume serial number speci-fied in the appropriate XTENT statement.

Now the next volume can be mounted on the disk drive and the job will be continued.

Figure 47. On-line CLRDSK Processing (Part 1 of 3)

Appendix J. processing Multi-Volume Files on Disk • 91

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Appendix J. Processing Multi-Volume Files on Disk • 93

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Alternate Track Area. An area of three information in System/360. Every byte consists of 8 bits, each having a value of

Data Display. Printed byte-for-byte rep-resentation of a logical record or block. description is printed.

Data Record. See Logical Record.

Default Value. The operand value. assumed by a program when the value is omit·ted from a control statement.

EBCDIC. (Extended Binary Coded Decimal Interchange Code). A specific set of 8-bit codes standard throughout System/360.

GIDssary

Hexadecimal. A character representation for a set of four bits. The values 0-15 are represented by the digits 0-9 and the alphabetic characters A-F.

Input. Data to be processed by a computer program. See also Output.

Inter-Block Gap. A blank space on magnetic tape that separates physical records.

I/O Area. An area (portion) of main (or pri.nt) job-control statements, and identify the requested prog~am phase.

Job-Control Statement. Anyone of the control st.atements in the input stream that identifies a job or defines its require-ments and options.

Label. A physical identification record on magnetic tape or disk.

Logical Record. A record identified from the standpoint of its content, function, and use rather than its physical attri-butes. It is meaningful with respect to the information i t contains. (Contrasted with Physical Record).

Mnemonic. A contraction or abbreviation whose characters are suggestive of the full expression.

Operand. The representation of a value that must be supplied to define a selective function to the program.

Output. The resultant data produced by a computer program. See also Input.

Pack. A storage t.echnique whereby two digits or one digit and sign are stored per byte.

Packed Decimal. See Pack.

Physical Record. A record identified from the standpoint of the manner or form in which i t is stored and retrieved; that is~

one that is meaningful with respect to access. <Contrasted with Logical Record).

Reblock. To change the format of a file so that a different number of logical records comprises one physical record. See Block.

Record. A general term for any unit of data that is distinct from all others when considered in a particular context.

System Disk Pack. The disk pack on which your disk-resident system is stored.

Tapemark. A special symbol that can be read from or written on magnetic tape.

Used to recognize the end of a file or file segment, and to segregate the labels from data.

Unblock. To change the format of a file so that a physical record comprises only one logical record. See Block.

Unpack. Storage technique whereby one digit, with or without sign~ is stored per byte .•

User Routine. A routine supplied by the user and incorporated into a utility pro-gram as a modification.

Utility Control Statement. A record that contains information to tailor a utility program to the requirements of the problem program.

Volume. That portion of a single unit of storage medium that is accessible to a single read/write mechanism. For example, a reel of magnetic tape for an IBM 2415 magnetic tape drive.

Volume Table of Contents (VTOC). A number of records on a disk pack, composed of disk file labels, specifying extents of, and identifying all files on the pack.

Zoned Decimal. See Unpack.

A= ( input) •••••••••••••••••••••••••••••• 10 A=(n"m) ., ••••••••••••••••••• 16,,21,,27,,31,,43 A= (n,. n) • • • • • • • • • • • • • • • • • • '. • • • • • • • • • • • 37 Alternate-Track Assignment Utility

program ••••••••••••••••••••••••••••••• 56

Defective track •••••••••••• - 48,49.54,,56,,57 DELET statement •• '. • • • • • • • • • • • • • • • • • • • •• 63 Initialize-Disk Utility program •••••••• 48 Inquiry program ••••••••••••••.•••••••••• H

Print format . . . .

Print span •••••••••••••• ⁰ • • • • • • • • • • • • • •

primary initialization •••••••••••••••••

Printer output ••••••••.•••••••••••••••• Secondary initialization •••••••••••••••

sector ... ¹⁰ . . . .

Sector pulse ~ •••••••••.••••••••••••••••

sequence-checking •••••••••••••••• G • • • • •

Sequence number-field ••••••••••••••••••

sequence-numbering ••••••••••••••••••••.

User initialization switches ••••••••••.

User routine reference points •••••••••.

User labels ••••••••••••••.•••••••••••••

Utility control statements •••••••••.

Utility-Modifier statement

Alternate-track assignment •••••••••••

Card-to-Disk ••••••••••••••••••••••••. Volume-label creation ••••••••••••••••••

Volume-label statement •••••••••••••••••

Volume Table of Contents ••••••••••

Dans le document IBM System/360 Model 20 Disk Programming System Disk Utility Programs (Page 90-99)