st_san_safe(5)OBSOLETED (Tunable Kernel Parameters)

st_san_safe(5)OBSOLETED

NAME st_san_safe - determine whether access to tape device special les 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 noties the tape driver whether it should allow access to device special les without the norewind-on-close option. When this tunable is on the tape driver will fail any open on a tape device special le 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 congurations. The disabling of device special les without no-rewind-on-close in a SAN tape backup solution conguration prevents the accidental sending of a rewind command on close from HP-UX systems 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 conguration. What Are the Side Effects of Turning the Tunable On? The tape driver will fail any open to a tape device special le 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 le 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 conguration or the system utilizes frecover. frecover will not function unless it has access to device special les 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 specic. This parameter may be removed or have its meaning changed in future releases of HP-UX.

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HP-UX 11i Version 3: September 2010

1

Hewlett-Packard Company

1

st_san_safe(5)OBSOLETED (Tunable Kernel Parameters)

st_san_safe(5)OBSOLETED

Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tunable values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see HP-UX Release Notes at http://www.hp.com/go/hpux-core-docs. AUTHOR

st_san_safe was developed by Hewlett-Packard.SEE ALSO kctune(1M), norewind_close_disabled(5), scsi_tape(7), scsimgr_estape(7).

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2

Hewlett-Packard Company

2

HP-UX 11i Version 3: September 2010