US Robotics 7931 Guide de l'utilisateur télécharger pdf (Page 241)

Chapter 8 Advanced Topics 217

Using the samd hastop Command

The samd command has an option that is specifically for use with HA-SAM. The

samd hastop command stops the archiver and stager daemons before stopping

sam-amld and its children.

The samd hastop command must not be used by an administrator in either a

stand-alone or shared Sun StorageTek SAM environment. In addition, the normal

samd stop command must not be used on nodes under HA-SAM control.

Using Sun StorageTek Libraries with HA-SAM

If you are using Sun StorageTek libraries in an HA-SAM environment, the STK

daemons need to be notified to use a forced dismount instead of a normal dismount

in the case of an involuntary failover. To accomplish this, the

/var/run/hasam_running file is created on the active Sun Cluster node when the

HA-SAM resource is brought online. This is a zero-byte file with root permissions.

If this file is detected on a node, sam-stkd and sam-stk_helper use

force_media to dismount the tape on the drive. This allows the successful

initialization of the library and the drives after an involuntary failover. The

hasam_running file is deleted when SAM resource is brought offline on a node.

In order to ensure the correct failover behavior for Sun StorageTek libraries, make

sure the /var/run/hasam_running is not deleted if found on a Sun Cluster node

that has an HA-SAM resource online.

Using Device Logging

The device-logging facility provides device-specific error information that you can

use to analyze certain types of device problems. It can help to determine a failing

sequence of events for an automated library, tape drive, or optical drive. The device-

logging facility does not collect soft media errors (such as recoverable read errors).

Device-logging messages are written to individual log files. There is a log file for

each automated library, for each tape and optical drive device, and one for the

historian. The log files are located in /var/opt/SUNWsamfs/devlog. The name of

each log file corresponds to the name of the equipment ordinal.

For example, assume that you have a Sun StorageTek SAM file system and a single

Hewlett Packard optical library with two optical drives.

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US Robotics 7931 Guide de l'utilisateur Page 241