Array Fault Tolerance Levels; Selective Storage Presentation (Ssp)/Access Control Lists (Acl) - HP 201723-B21 - StorageWorks Modular SAN Array 1000 Hard Drive Reference Manual

MSA1000 Hardware Components

Array Fault Tolerance Levels

Fault tolerance refers to several possible methods used to protect your MSA1000
storage system from data loss in the event of a hardware failure somewhere in the
storage system. Each method has its advantages; choosing one requires careful
planning for your particular requirements.
The RAID configuration methods supported by the MSA1000 Controller include:
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Further data protection can be achieved by assigning one or more online spares to
any fault-tolerant array.
For detailed information on fault tolerance options, see the user documents for the
ACU or the CLI.

Selective Storage Presentation (SSP)/Access Control Lists (ACL)

SSP (or ACLs) permit sharing of the MSA1000 storage between servers,
including servers running different operating systems.
Each logical drive on the controller has a list that contains the worldwide names of
the server host adapters that have access to the drive. If a server tries to send
commands to a logical drive that it does not have access to, the firmware will
reject the command.
The SSP (or ACL) maps the worldwide names of server host adapters to
connection names and sets up access rights for the logical drives based on these
worldwide names.
SSP is set up and managed through the ACU; ACLs are set up and managed
through the CLI.
The following diagram illustrates an controlled-access scenario.
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No fault tolerance (RAID 0)
Drive mirroring (RAID 1)
Drive mirroring and striping (RAID 1+0)
Distributed data guarding (RAID 5)
Advanced Data Guarding (RAID 6)
HP StorageWorks 1000 Modular Smart Array Reference Guide