SPEED PowerFlex

Question 1

What is the fault set requirement per PD?

Answer 1

3

MDMs also need to be spread across fault sets

Question 2

What is the most important consideration when sizing fault sets?

Answer 2

spare capacity

when we have 3 fault sets we need to allow one fault set to fit in the other two in case of failure (space capacity needs to be 34% when all fault sets are equal)

why customers use fault sets when they have around 10 or more since spare capacity would only be 10% which is standard

Question 3

How many snapshots are allowed per volume on PowerFlex?

Answer 3

126

Question 4

What is true of all snapshots on PowerFlex?

Answer 4

all thin provisioned - acts as a normal volume

Question 5

What is a vTree (volume tree)?

Answer 5

tree spanning from the source volume whose siblings are either snapshots of the volume itself or descendants of it

Question 6

What is the vTree limit on PowerFlex?

Answer 6

127 members (1 taken up by original volume and than 126 snaps)

Question 7

What are the QoS options on PowerFlex?

Answer 7

limiting workload per volume (IOPS/bandwidth on SDCs)
changing default values of rebuild, rebalance, and migration