T10000C/D - Standard Capacity and Maximum Capacity Feature Discussion

Asset ID:	1-71-1420340.1
Update Date:	2017-09-25
Keywords:

Solution Type Technical Instruction Sure

Solution 1420340.1 : T10000C/D - Standard Capacity and Maximum Capacity Feature Discussion

Applies to:

Sun StorageTek T10000 Tape Drive - Version All Versions and later
StorageTek T10000D Tape Drive - Version All Versions and later
StorageTek T10000C Tape Drive - Version All Versions and later
Information in this document applies to any platform.

Goal

Describes the Maximum Capacity feature. This is also called the Max Capacity feature.

Solution

A T1000C and T10000D drive will write compressed data on the tape, the tape capacity tracked by the drive is actually listed in compressed bytes.

With MAX CAPACITY OFF, we stop writing when the drive runs out of physical space on the tape. How much uncompressed data that is, depends on the compression ratio, which is dependent on the data. Engineering is unable to determine how much uncompressed data is written to a tape from a drive dump. Each tape will give a different amount of capacity with this feature turned on. This feature allows the use of tape capacity normally reserved to ensure success of tape-to-tape copy operations. Enabling this feature can increase cartridge capacity by five to ten percent.This capacity is dependent on several factors and so it cannot be guaranteed. When MAX CAPACITY is ON, a full tape of data cannot be assured to fit if it is copied to another tape.

This feature can be turned on using either of these two methods:
1. Turn the feature on for all tapes that are written in a drive by using VOP. This requires 1.0.18 or higher VOP and a T10KC drive running 1.53.311 or higher code. This option will set the feature to be permanently on.
Notes:
- The drive must be offline to make changes to the configuration.
- Ensure that the drive is not running a customer job before taking the drive offline.
- Select the Configure menu item.
- Select the Fibre tab. At the bottom you will see an option for Max Capacity.
- It is defaulted to off.

2. The feature can be turned on/off using software.
Notes:
- See the Fibre Channel Users Guide. (On page 135 for pn MT9259 revision L Attached to this Knowledge
Entry )
- This is under the Mode Select command and is called the Read-Write Control Page.
- Allow Max Capacity (AMC ) in byte 5 bit 0.
(1= Maximum capacity is turned on, 0=Maximum capacity is turned off))

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