PowerMax and VMAX All Flash Solutions Design (Host Considerations – Storage Allocation) Flashcards
How are Host IO Limits set on PowerMax/VMAX?
set on a per SG basis - can be placed on parent and child SG
SG associated w/ a masking view
limits distributed across the directors in the PG of the associated masking view
What is the relationship between parent and child SGs for Host IO Limits?
total IO rate of all the children remains by the limit of the parent - even if sum of all IO limits on children exceeds parent
What are the 3 Dynamic IO Distribution settings for Host IO Limits?
Never
OnFailure
Always
What is the Never setting for Dynamic IO Distribution?
implies static even distribution
default setting
What is the OnFailure setting for Dynamic IO Distribution?
on a failure IO limits are redistributed to online ports
What is the Always setting for Dynamic IO Distribution?
IO limits are dynamically distributed based on demand
What are the limits for IO Limits?
only one limit per SG
devices in multiple SGs can only adhere to one limit
a SG w/ a limit can be associated w/ max 1 PG
total host IO limit can only be acheived w/ proper director balance
What is the range of bandwidth IO Limit?
100 - 100,000 MB/s
What is the range of IOPS IO Limit?
100 - 1,000,000 IOPS
What is an SRP?
collection of data pools that provide FAST
What is the factory default SRP that is created?
SRP_1
How does FAST work?
creates thin pools according to each individual disk technology, capacity, and RAID type
What FAST feature is available for systems running HYPERMAX OS 5977 or higher?
automatically configures disk groups to form a SRP
What FAST feature is available for systems running PowerMax OS 5978 or higher?
have their storage capacity levels checked at the SRP level or SRP emulation level
