Quantum 6-00360-15 assume the stripe group is already in real-time mode as a, Failure Semantics

Appendix D Quality of Service Guide

Callbacks

Figure 62 Non-Real-time

Token Adjustments

	In Figure 62, assume the stripe group is already in real-time mode as a
	result of an rtio request from client A. Clients B and D are doing non-real-
	time I/O to the stripe group and have a token that specifies the amount of
	non-real-time I/O available. Client C then requests a non-real-time I/O
	token in Step 1. The FSM calls back to Clients B and D and specifies the
	new token amount in Steps 2-3. The clients respond in Steps 4-5,
	acknowledging the new token amount. The FSM then responds to Client
	C with the new token in Step 6.
	There are two major failures that affect QOS: FSM crashes and client
Failure Semantics
	crashes. These can also be loss of communication (network outages). For
	client and server failures, the system attempts to readjust itself to the pre-
	failure state without any manual intervention.

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