Setting And Determining The Current Type Level; Identifying A Protection Information Drive; Seagate Raid Rebuild - Seagate ST900MM0006 Product Manual

9.7.2

Setting and determining the current Type Level

A drive is initialized to a type of PI by using the format command on a PI capable drive. Once a drive is formatted to a PI
Type, it may be queried by a Read Capacity (16) command to report the PI type which it is currently formatted to. PI Types
cannot coexist on a single drive. A drive can only be formatted to a single PI Type. It can be changed at anytime to a new
Type but requires a low level format which destroys all existing data on the drive. No other vehicle for changing the PI type is
provided by the T10 SBC3 specification.
Type 1 PI format CDB command: 04 90 00 00 00 00, Write Buffer: 00 A0 00 00
Type 2 PI format CDB command: 04 D0 00 00 00 00, Write Buffer: 00 A0 00 00
9.7.3

Identifying a Protection Information drive

The Standard Inquiry provides a bit to indicate if PI is support by the drive. Vital Product Descriptor (VPD) page 0x86
provides bits to indicate the PI Types supported and which PI fields the drive supports checking.
For further details with respect to PI, please refer to SCSI Block Commands - 3 (SBC-3) Draft Standard docu-
Note.
mentation.
9.8 S RAID R
EAGATE
Seagate RAID Rebuild is an industry standard feature to enable faster recovery from a failed drive in a RAID configuration. It
improves RAID rebuild performance by extracting easily readable data from a failing drive. It quickly identifies blocks that
would take longer to recover from the failed drive than to rebuild from the remaining drives in the RAID group.
This feature allows host control of error recovery, maximizes up time, and minimizes likelihood of 2nd drive failure in a RAID
configuration.
S 10K.6 SAS P
AVVIO RODUCT
™
EBUILD
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ANUAL EV
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