Sun StorageTek T10000A Tape Drive
 
Sun StorageTek T10000 Tape Drive
 

PLA-Support>Sun Systems>TAPE>Tape Hardware>SN-TP: STK T-Series Drive
 

In this Document

Symptoms

Cause

Solution

Oracle Confidential PARTNER - Available to partners (SUN).
Reason: Confidential for service personnel

Applies to:

Symptoms

 T10000A non-encrypting drives have poor read performance and may take interface control checks (IFCC). This affects large block sizes such as 256 K. Small block sizes do not seem to trigger the problem.

Cause

2 Gb Non-Encrypting T10000A drives may experience slow read performance and possibly take Interface Control Checks (IFCC) which abend the job when the host is trying to read large block sizes. (256K)  The issue has to do with the fact that early in the product development cycle engineering identified a hang condition that affected the DIA version 101 card in the drive. A code workaround was put in place that issues a backspace and re-read when the DIA 101 card is found to be hung. This takes about 8 seconds and causes slow read performance.

DIA 102 (and higher) cards were later cut into the T10000A line. These cards do not have the hang problem.

PN 315464701 Encryption Capable T10000A 2 Gb drives have a 3xx level DIA card in them and do not have this problem.

The VTSS will only write:
- labels, tape marks, 32K or 62K data blocks so RTDs are not affected.

Solution

 If you are having this problem try an Encryption capable (PN 315464701) drive to see if you still have the issue.  The Encryption Capable 2 Gb T10KA drives all have a 3xx card version so they would not be subject to the DIA 101 issues.

The hardware level on the Non-Encryption capable drives can be verified. Using VOP you can view the CO hardware type in the Version tab. The first 3 digits are the version of the card. for example:

A CO hardware type of "104a93" would be a 104 version card.

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