Chapter 2 Storage

Question 1

Primary Level of Failures
to Tolerate (PFTT)

Answer 1

Policy defines how many hosts/device failures a VM object can withstand. If no
storage policy is selected at the time of provisioning a VM, this policy is assigned by default

Question 2

Secondary Level of
Failures to Tolerate
(SFTT)

Answer 2

In stretched clusters, this policy defines how many additional
host failures can be tolerated after a site failure’s PFTT has been
reached. If PFTT = 1, SFTT = 2, and one site is inaccessible, two
more host failures can be tolerated. The default setting for this
policy is 1, and the maximum is 3

Question 3

Data Locality

Answer 3

If PFTT = 0, this option is available. The options for this policy
are None, Preferred, and Secondary. This allows objects to be
limited to one site or one host in stretched clusters. The default
setting for this policy is None.

Question 4

Failure Tolerance Method

Answer 4

This policy defines whether the data replication mechanism is
optimized for performance or capacity. If RAID-1 (Mirroring)—
Performance is selected, there will be more space consumed in the
object placement but better performance for accessing the space.
If RAID-5/6 (Erasure Coding)—Capacity is selected, there will be
less disk utilization, but performance will be reduced