Viewing Pool and Device Status (BUI)
Storage Pool Capacity
When allocating raw storage to pools, keep in mind that filling pools completely will result in
significantly reduced performance, especially when writing to shares or LUNs. These effects
become more noticeable as the pool reaches full capacity.
Data Profiles for Storage Pools
After storage devices are physically verified and resources are allocated for a storage pool,
the next step is to choose a storage profile that reflects your reliability, availability and
serviceability (RAS), and performance goals. The set of possible profiles presented depends on
your available storage. The following table lists all possible profiles and their descriptions.
TABLE 20
Data Profiles
Data Profile Description
Dual Parity Options
Triple mirrored Data is triply mirrored, yielding a very highly reliable
and high-performing system (for example, storage
for a critical database). This configuration is intended
for situations in which maximum performance and
availability are required. Compared with a two-way
mirror, a three-way mirror adds additional IOPS per
stored block and higher level protection against failures.
Note: A controller without expansion storage should not
be configured with triple mirroring.
Double parity RAID RAID in which each stripe contains two parity disks.
As with triple mirroring, this yields high availability, as
data remains available with the failure of any two disks.
Double parity RAID is a higher capacity option than
the mirroring options and is intended either for high-
throughput sequential-access workloads (such as backup)
or for storing large amounts of data with low random-
read component.
Single Parity Options
Mirrored Data is mirrored, reducing capacity by half, but
yielding a highly reliable and high-performing system.
Recommended when space is considered ample, but
performance is at a premium (for example, database
storage).
Single parity RAID, narrow stripes RAID in which each stripe is kept to three data disks
and a single parity disk. For situations in which single
parity protection is acceptable, single parity RAID offers
a much higher capacity option than simple mirroring.
This higher capacity needs to be balanced against a
Configuring the Appliance 111
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