Compaq OSI/APLMGR D43, OSI/FTAM D43 manual Storage Level of Support Compaq File Attributes

Compaq FTAM Responder Support of	Storage Group File Attributes
ISO FTAM Functions

filesize parameter is not specified in a create request, the responder creates a file with a future-filesize value of 8 MB.

Subsequent change-attribute requests can change the value of max-extents. In all cases, the minimum value of max-extents is 16, and the maximum value is 978. The extent size cannot be changed.

Because of file-size limitations imposed by the Guardian file system, the Compaq responder cannot support all possible values of the future-filesize attribute sent in create and change-attribute requests. The Compaq responder creates files with a maximum future-filesize value of 1 GB. If a value greater than 1 GB is requested, the responder returns an informative diagnostic message and creates the file with a future-filesize value of 1 GB.

The smallest file the Compaq responder can create has a future-filesize value of 64 KB. If a smaller future-filesize value is requested, the responder creates the file with a future- filesize value of 64 KB. (Note, however, that the entire 64K is not necessarily allocated; only as many extents as needed are allocated.) No diagnostic message is returned in this case.

Note that the maximum size of files is limited by the physical storage capacity of the Compaq disk device being used. If an application attempts to write to a Compaq responder a file larger than 1 GB or larger than the disk device can hold, a file-system error 43 (unable to obtain disk space for file extent) will eventually occur in a WRITE call, and the Compaq responder will send a cancel to the application.

Table 4-11 summarizes the Compaq support for the storage attributes.

Table 4-11. FTAM Storage Attributes and Corresponding Compaq File Attributes

Storage	Level of Support	Compaq File Attributes
Attributes

Storage account	Partial
Date and time of	Partial if protected by
creation	Safeguard security software;
	Full if protected by Guardian
	environment

creation date-time for files other than NBS-9; current time for NBS-9

Date and time of	Partial if protected by
last modification	Safeguard security software;
	Full if protected by Guardian
	environment

last modification date-time for files other than NBS-9; current time for NBS-9

Date and time of	Partial if protected by
last read access	Safeguard security software;
	Full if protected by Guardian
	environment

last open date-time for files other than NBS-9; current time for NBS-9

Date and time of	Partial
last attribute
modification

OSI/FTAM Responder Manual—425199-001

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