SL8500 - Phantom HandBots Noted In SL Console In 4-Handbot Library

Asset ID:	1-72-1014181.1
Update Date:	2010-12-27
Keywords:

Solution Type Problem Resolution Sure

Solution 1014181.1 : SL8500 - Phantom HandBots Noted In SL Console In 4-Handbot Library

Applies to:

Sun StorageTek SL8500 Modular Library System - Version: Not Applicable and later [Release: N/A and later]
All Platforms
Checked for relevance on 26-Dec-2010.

Symptoms

Phantom HandBots in SLC
Too many robots being seen
Excessive handbots

Changes

{CHANGE}

Cause

Additional Information
Phantom Bots Noted In SLC In 4-Handbot Library

Four additional HandBot icons can be seen in SLC as inoperative HandBots event though they do not exist.

Several factors must occur for this problem to occur:

-Use of the SSD to the right.

-At the start of the HandBot sweep the bot must be at the inner most inside column.

Note: The HandBots rest at this location after a full rail audit.

-Start of rail initialization.

-Marginal conditions on the HandBot or rail.

Solution

Resolution
Microcode fixed this issue in release 3.72 and above.

As a temporary work around insure the HandBots are not at the inner most column before activating the SSD to the right. This can be done via a physical audit in SLC to a different location.

A rounding code error caused the library controller to think another robot was on the same rail. Once any rail indicates that two bots are on a rail the library assumes it has 8 bots. This will cause four phantom bots to appear on the SLC status screen.

Internal Comments
HandBot, Correct HandBot status in SLC, Initialization, SL8500, Microcode error, SLC, SL Console
Previously Published As STKKB80328

Attachments

This solution has no attachment