What is the best data profile to configure a pool that needs high performance and high availability?
A.
Striped
B.
Mirrored
C.
Double Parity RAID
D.
Triple Parity RAID
E.
Single Parity RAID
Explanation:
Double Parity RAID:
RAID in which each stripe contains two parity disks. This yields high capacity and
high availability, as data remains available even with the failure of any two disks. The
capacity and availability come at some cost to performance: parity needs to be
calculated on writes (costing both CPU and I/O bandwidth) and many concurrent
I/Os need to be performed to access a single block (reducing available I/O
operations). The performance effects on read operations are often greatly diminished
when cache is available.
Sun ZFS Storage 7000 System Administration Guide,Verification and Allocation,ProfileConfiguration