Data Protection Operations - Hitachi VSP F1500 User And Reference Manual

Data protection operations

User data files are normally placed on a disk through a software layer such as
a file system, LVM, disk driver, SCSI protocol driver, bus adapter, and SAN
switching fabric. Data corruption can happen due to software layer bugs or
human error. CCI Data Protection Facility does not prevent these types of
errors. On the other hand, the purpose of data protection is to prevent
writing to volumes that the RAID storage system is guarding.
Data protection functions include:
• Data Retention Utility
• Volume Retention Manager
• Volume Security
• Encryption License Key
• Database Validator
Data Retention Utility
The purpose of the Data Retention Utility is to prevent writing to volumes
that the RAID storage system is guarding. Similar to the command that
supports Database Validator, Data Retention Utility sets a protection attribute
for the specified LU.
• Hide from Inquiry command. The RAID storage system conceals the
target volumes from the SCSI Inquiry command by responding
"unpopulated volume" (0x7F) to the device type.
• SIZE 0 volume. The RAID storage system replies with "SIZE 0" to the
target volumes through the SCSI Read capacity command.
• Read protection. The RAID storage system protects reading from the
target volumes by responding with the "Illegal function" check condition
(SenseKey = 0x05, SenseCode = 0x2200).
• Write protection. The RAID storage system replies with "Write Protect"
in the mode sense header, and protects from writing the target volumes
by responding with the "Write Protect" check condition (SenseKey=0x07,
SenseCode=0x2700).
• S-VOL disabling.
The RAID storage system rejects the command execution of the copy
series program product for not to be overwritten the secondary (target)
volume by the copy process of copy series program product (TrueCopy,
Universal Replicator, ShadowImage, Copy-on-Write Snapshot, global-
active device), and protects the target volume. This option can be used
with the other Data Retention Utility options in parallel. For example, if
you want to protect from the writing by the both copy series program
product and the host accessing, set the both write protection option and
this option. Only the setting of write protection option cannot protect the
target volume from the writing executed by the copy processing of the
copy series program product.
7-2
Data protection operations with CCI
Command Control Interface User and Reference Guide