st_san_safe.5 (2010 09)

s
st_san_safe(5) st_san_safe(5)
OBSOLETED OBSOLETED
(Tunable Kernel Parameters)
NAME
st_san_safe - determine whether access to tape device special files without the no-rewind-on-close option
is allowed (OBSOLETED)
VALUES
Failsafe
0 (off)
Default
0 (off)
Allowed values
0 (off)
any positive integer (on)
Recommended values
0 (off) or 1 (on)
DESCRIPTION
Note: this tunable is obsoleted and has been renamed to
norewind_close_disabled
beginning with
release HP-UX 11i v3.
This tunable notifies the tape driver whether it should allow access to device special files without the no-
rewind-on-close option. When this tunable is on the tape driver will fail any open on a tape device special
file without the no-rewind-on-close option (that is,
/dev/rmt/1m or /dev/rmt/1mb) with a status of
[EINVAL].
The
st_san_safe tunable allows the safe sharing of tape devices in SAN tape backup solution
configurations. The disabling of device special files without no-rewind-on-close in a SAN tape backup
solution configuration prevents the accidental sending of a rewind command on close from HP-UX sys-
tems via standard tape commands like mt, which would corrupt a backup in process.
Who Is Expected to Change This Tunable?
Anyone.
Restrictions on Changing
Changes to this tunable take effect immediately.
When Should the Tunable Be Turned On?
This tunable should be turned on if the system is going to be used in a SAN tape backup solution
configuration.
What Are the Side Effects of Turning the Tunable On?
The tape driver will fail any open to a tape device special file that does not have the no-rewind-on-close
option with a status of [EINVAL]. This behavior prevents the usage of any tape device special file without
the no-rewind-on-close option.
When Should the Tunable Be Turned Off?
This tunable should be turned off if the system is not part of a SAN tape backup solution configuration or
the system utilizes
frecover. frecover will not function unless it has access to device special files
without the no-rewind-on-close option.
What Are the Side Effects of Turning the Tunable Off?
A rewind may be issued from this system accidentally on close possibly corrupting a backup being issued
from another system on the SAN.
What Other Tunables Should Be Changed at the Same Time?
None.
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its
meaning changed in future releases of HP-UX.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1