Aix Shared Open Function; Retry Reserved-Volume Function; Supported Os And Os Versions; Shared Volume And Data Exchange Version - HP StorageWorks P9000 User Manual

AIX Shared Open Function

To share Data Exchange volumes on multiple AIX operating systems:
• For Data Exchange versions 01-xx-59 and earlier, when one AIX OS opens a Data Exchange
volume, the other AIX OS cannot open the Data Exchange volume. This is because the AIX OS
reserves the Data Exchange volume when it opens it.
• For Data Exchange 01-xx-60 and later, it is possible to share a Data Exchange volume across
multiple AIX operating systems by specifying the environment variable FAL_NO_RESERVE.
Table 6 on page 38 shows the relationship between shared volumes and Data Exchange versions.
For AIX 4.3.1 or later (32-bit), you cannot transfer over 2 GB data (AIX restriction).
Table 6 Shared Volume and Data Exchange Version
Object
FAL for AIX
(32/64 bit)
To define environment variables:
• By specifying the environment variable (FAL_NO_RESERVE), you can select shared open or exclusive
open. Table 7
(FAL_NO_RESERVE) and open mode.
Table 7 Environment Variable (FAL_NO_RESERVE) and Open Mode
No definition of environment variable
ON
OFF
Other

Retry Reserved-Volume Function

When Data Exchange sends data to volume reserved by another system, an OS system error can
occur. The retry reserved-volume function can retry sending data to the reserved volume by specifying
wait time and retry count in an environment variable. Data Exchange can resend the data when the
reserved volume is released by the other system.

Supported OS and OS Versions

Table 8 on page 39 shows the supported OS and OS versions. HP-UX does not issue the reserve
function because HP-UX does not generate a system error when it accesses a reserved volume, and
the device driver of HP-UX retries to access the reserved volume.
38 About Data Exchange Operations
Version
01-xx-59 and earlier
01-xx-60 and later
on page 38 shows the relationship between the environment variable
FAL_NO_RESERVE
Description
Cannot open a shared volume from multiple AIX systems.
Can open a shared volume from multiple AIX systems by
specifying the environment variable.
Exclusive Open (Original mode)
Shared Open
Exclusive Open
Exclusive Open
Open Mode