This is the section for Storage Class Construct information. These records are collected when SMSDATA is selected, and Storage Class constructs are defined to the control data set selected. The record type for this record is 'SC'.

Name

Description

DSCNMFLD

The Storage Class Construct name.

DSCNMLEN

The length of this construct name.

DSCNAME

The name of this construct.

DSCUSER

The USERID of the last person to make a change to this construct.

DSCDATE

The date that this construct was last changed. The format is "YYYY/MM/DD" in EBCDIC.

DSCTIME

The time that this construct was last changed. The format is "HH:MM" in EBCDIC.

DSCDESC

The description of this construct.

DSCFLAGS

Storage Class Parameters Specification Flags. The following are indicated if the specified bit is '1'.

DSCDFGSP

This bit indicates that guaranteed space is to be allocated. Multi-volume data sets can be pre-allocated with the same or different amounts of space on more than one volume.

DSCDFAVL

Availability options have been specified, see DSCAVAIL.

DSCFDIRR

Direct access response time objective has been specified, see DSCDIRR.

DSCFDIRB

Direct access bias has been specified, see DSCDIRB.

DSCFSEQR

Sequential access response time objective has been specified, see DSCSEQR.

DSCFSEQB

Sequential access bias has been specified, see DSCSEQR.

DSCSYNCD

This bit indicates that the system should return from a BSAM CHECK issued for a WRITE against a PDSE member after (synchronized) the data has actually been written to a storage device.

DSCFIAD

Initial access response time has been specified, see DSCIACDL.

DSCFLAG2

Storage Class Parameters Specification Flags Byte 2. The following are indicated if the specified bit is '1'.

DSCDFACC

Accessibility has been specified. See DSCACCES.

DSCDFSDR

Striping Sustained Data Rate has been specified. See DSCSTSDR.

DSCFDCFW

Direct CF weight has been specified; see DSCDIRCW.

DSCFSCFW

Sequential CF weight has been specified; see DSCSEQSW.

DSCFPAV

PAV options have been specified; see DSCPAV.

DSCDSSEP

Data set separation has been specified

DSCTIER

Multi-tier storage class or not

DSCACCVF

ACC version parameter specified; see DSCACCV.

DSCFLAG3

Storage Class Parameters Specification Flags Byte 3. The following are indicated if the specified bit is '1'

DSCACCBF

ACC Backup parameter specified; see DSCACCB.

DSCAVAIL

This field shows the availability options specified for the Storage Class and is mapped by DSCAVLDC, DSCAVLST, DSCAVLCN, and DSCAVLPR.

0

Do not care about availability.

1

Use standard availability.

2

Use continuous availability.

3

Continuous availability preferred.

DSCDIRB

This field shows the direct access bias for data sets in this storage class. The direct access bias tells whether the majority of I/O scheduled for the data sets in this storage class is for READ, WRITE, or unknown. This field is mapped by DSCBIADC, DSCBIARD, and DSCBIAWR.

0

Direct access bias is unknown.

1

Direct access has read bias.

2

Direct access has write bias.

DSCSEQB

This field shows the sequential access bias for data sets in this Storage Class. The sequential access bias shows whether the majority of I/O scheduled for the data sets in this Storage Class is for READ, WRITE or unknown. This field is also mapped by DSCBIADC, DSCBIARD, and DSCBIAWR.

0

Sequential access bias is unknown.

1

Sequential access has read bias.

2

Sequential access has write bias.

DSCACCES

This field specifies whether the data sets in this storage class should be allocated to volumes supported by concurrent copy. When used with the ABACKUP/BACKUP COPY TECHNIQUE attributes of the management class, this field determines if the data sets should retain continuous write access during backup.

0

Continuous Preferred - The data set should be allocated to volumes supported by concurrent copy. If this cannot be done, a data set can be allocated to volumes that do not support concurrent copy.

1

Continuous - The data set must be allocated to volumes supported by concurrent copy. The allocation is unsuccessful for data sets that cannot be allocated to such volumes.

2

Standard - The data set should be allocated to volumes that do not support concurrent copy. If this cannot be done, a data set can be allocated to volumes that support concurrent copy.

3

Nopref - The data set is allocated to volumes whether or not the volumes are concurrent copy capable.

DSCIACDL

This field indicates the time required (in seconds) to locate, mount, and prepare media for data transfer.

DSCDIRR

This field shows the direct access response time required for data sets in this storage class. The value is the number of milliseconds required to read or write a 4-kilobyte block of data.

DSCSEQR

This field shows the sequential access response time required for data sets in this storage class. The value is the number of milliseconds required to read or write a 4-kilobyte block of data.

DSCSTSDR

This field shows the sustained data transfer rate for data sets in this storage class. The system uses this value to determine the number of stripes it will try to allocate for the data set.

DSCCCHST

Cache set name, comprised of two parts - DSCCSLEN (length of following name), and DSCSNAM

DSCDIRCW

Direct CF weight

DSCSEQCW

Sequential CF weight

DSCPAV

PAV value specified for use in the volume selection process

• 0 - The PAV status of the volume is not considered in the volume selection algorithm
• 1 - Volumes with no PAV capability are preferred over volumes with PAV capability (Standard)
• 2 - Volumes with PAV capability are preferred over volumes without PAV capability (Preferred)
• 3 - Only volumes with PAV capability will be eligible for selection (Required)

DSCACCV

Versioning device information

DSCACCB

Backup device information