Oracle Hierarchical Storage Manager (HSM) and StorageTek QFS Software
 
StorageTek T10000D Tape Drive
 
StorageTek T10000C Tape Drive
 

PLA-Support>Sun Systems>TAPE>Backup Software-Filesystems>SN-TP: SAMQFS
 

In this Document

Goal

Solution

Created from <SR 3-9415389267>

Applies to:

Goal

Understand the DIV option and what's needed to configure it.
 

Solution

The Data Integrity Validation (DIV) feature of SAM-QFS ensures that the data copied to tape archive is exactly the same data stored in the SAM disk cache.

DIV is supported with SAM-QFS only when using Oracle's StorageTek T10000C or T10000D tape drives.   It is not supported with SAM-QFS when using T10000A or T10000B drives.

The recommended release level for SAM-QFS when using DIV is the 5.3-02 patch (5.3.14 build) or higher.

The minimum firmware release level on the T10000C drives is 1.53.315 and 4.06.106 for the T10000D drives.   However, recommended firmware levels are currently 1.61.301 for the T10000C drives and 4.08.105 for the T10000D drives.

The SAM-QFS server should be running on Solaris 11.

When DIV mode is enabled on the SAM-QFS file system for the archive copy, the SAM-QFS file system enables DIV in the st driver using the mt DADP command. The st driver then calculates a checksum (hardware or software generated depending on the server platform) for every logical block written by the archiver to the tape. The checksum is checked by the tape storage drive and it must match the data to be written to the tape. The StorageTek T10000C drive will put both the user data and the checksum on the media.

Take the following steps to configure DIV in SAM-QFS

1. Use the samd stop command to stop all operations.
   
   # samd stop
     
   
   
2. Set the div value in the /etc/opt/SUNWsamfs/defaults.conf file to either on or verify.
   
   div = on | verify
     
   
   
3. Propagate the configuration changes.
   
   # samd config
     
   
   
4. Start all operations.
   
   # samd start
     

For more details on DIV, please refer to the chapter titled "Data Integrity Validation in SAM-QFS" in the SAM-QFS 5.3 Configuration and Administration Guide.

Data Integrity Validation Feature of StorageTek T10000 Tape Drives - http://www.oracle.com/technetwork/articles/systems-hardware-architecture/storagetek-data-integrity-294729.pdf

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