0:33,554,432 [ PAGE[S] ]
specifies the extent size in pages (2048-byte units). The minimum extent size is one page, so
specifying 0 pages allocates one page (2048 bytes). The PAGE is the default unit of
measurement for the EXT option.
0:68,719,476,735 BYTE[S]
specifies the extent size in bytes. BACKUP rounds up to the next full page (2048-byte units).
For example, if you specify 2047 bytes, BACKUP allocates one page; for 2049, BACKUP
allocates two pages, and so on.
0:68,719,476,735 REC[S]
specifies the extent size based on the current settings for record length, data-block length,
index-block length, key-field lengths, and compression settings. BACKUP rounds up to the next
full page.
Guidelines
• You cannot include the EXT option with the PARTONLY option.
• If BACKUP returns file-system error 45 (file is full) for a key-sequenced file, back up that file
separately with the EXT option to specify larger extent sizes. Error 45 can appear when the
specified slack values cause significant file size increases in converted key-sequenced files.
• If BACKUP returns error 45 for a key-sequenced and partitioned file (because the default extent
size of the temporary disk file used by BACKUP is too small), use the EXT option to specify
larger extent sizes.
Examples
• To convert DP1 files to DP2 format and set primary and secondary extent sizes to two and
three pages (respectively) for the files in $DP1.CONV:
1> BACKUP $TAPE, $DP1.CONV.*, DP2FORMAT, EXT (2,3)
• To set the data slack and index slack values for a DP1 to DP2 file conversion and set primary
and secondary file extents to three:
2> BACKUP $TAPE1, *.*.*, DP2FORMAT, DSLACK 20, ISLACK
10,&
2> &EXT 3
IGNORE
The IGNORE option directs BACKUP to ignore certain data errors on disk. BACKUP writes the
invalid data to tape (if possible); otherwise, zeros are written in place of invalid data.
IGNORE
Guidelines
• Specify the IGNORE option to back up a file that is marked as corrupt.
• If you omit IGNORE and a data error occurs, BACKUP skips the file and starts processing the
next file.
• BACKUP ignores errors in DP1 files by sectors (a sector is 512 bytes) and sends an error
message to the output file for each defective sector. For DP2 files, BACKUP ignores errors on
54 BACKUP
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