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5.4 Checking Operation after Installation and Preparing the HDDs for Use
C141-E252 59
c) Issue the REQUEST SENSE command to collect sense data. When sense data has been collected
successfully, perform an analysis to check for recoverable errors, and retry operations for
recovery from any such errors.
(5) Checking at abnormal end
When sense data can be obtained, analyze the sense data and retry recovery for a recoverable error.
Refer to Chapter 6 "Sense Data and Error Recovery Method" of the SAS INTERFACE MANUAL
for further details.
5.4.2 Formatting
Since the HDD is formatted with a specific (default) data format for each model (part number) when
shipped from the factory, the disk need not be formatted (initialized) when it is installed in the
system.
However, when the system needs data attributes different from the default format, all sides of the disk
must be formatted (initialized) according to the procedures below.
The user can change the following data attributes at initialization:
• Logical data block length
• Number of logical data blocks in the user space
This section outlines the formatting at installation. Refer to Subsection 4.1.4 "MODE
SELECT (15)", 4.1.5 "MODE SELECT EXTENDED (55)", 4.3.1 "FORMAT UNIT (04)", and
Chapter 7 "Disk Media Management" of the SAS INTERFACE MANUAL for further details.
(1) MODE SELECT/MODE SELECT EXTENDED command
Specify the format attributes on the disk with the MODE SELECT or MODE SELECT EXTENDED
command. The parameters are as follows.
a. Block descriptor
Specify the size (byte length) of the logical data block in the "data block length" field. To
explicitly specify the number of logical data blocks, specify the number in the "number of data
blocks" field. Otherwise, specify 0 in "number of data blocks" field. In this case, the currently
set value is used.
b. Format parameter (page code = 3)
Specify the number of spare sectors for each cell in the "alternate sectors/zone" field (cannot be
changed).