Table 36 RAID options (continued)
RAID
a
Provides the following Configuration
considerations
n
RAID 6 (6 + 2) —
Consists of eight drives
with dual parity and data
striped across each
device.
n
RAID 6 (14 + 2) —
Consists of 16 drives with
dual parity and data
striped across each
device.
n
RAID 6 (14 + 2) provides
87.5% data storage
capacity.
n
Withstands failure of two
drives within the RAID 6
group.
a.
When the drive is (non-disruptively) replaced by a sparing operation, the array re-
establishes the mirrored pair and automatically re-synchronizes the data with the drive. The
sparing operation is available on all RAID types. The array can read from either mirror drive.
VMAX3 arrays do not support RAID 10. Designed for 100% virtually provisioned
storage environments, the VMAX3 array features virtually provisioned (thin)
volumes widely striped across RAID 1 disk pairs to provide both I/O concurrency
and the RAID 1 protection level. The benefits are equal or superior to those
provided by RAID 10 or striped meta volumes.
l
FAST Storage Resource Pools — one (default) FAST Storage Resource Pool is
pre-configured on the array. This process is automatic and requires no setup.
Depending on the storage environment, SRPs can consist of either FBA or CKD
storage pools, or a mixture of both in mixed environments. FAST uses the same
algorithms to maintain the specified SL, regardless of the environment. However,
it can only move data between pools of the same type. FBA and CKD data will not
be mixed in the same storage pool, but can be in the same disk group.
You cannot modify FAST Storage Resource Pools, but you can list and display
their configuration.
You can generate reports detailing the demand storage groups or Service Levels
are placing on the Storage Resource Pools.
The following image shows FAST components that are pre-configured at the
factory. Once installed, thin devices are created and added to the storage group.
Storage Tiering
86 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS
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