EMC VMAX 200K - Open Systems-Specific Provisioning

Thin CKD
If you are using HYPERMAX 5977 or higher, initialize and label thin devices using the
ICKDSF INIT utility.
Thin device oversubscription
A thin device can be presented for host use before mapping all of the reported
capacity of the device.
The sum of the reported capacities of the thin devices using a given pool can exceed
the available storage capacity of the pool. Thin devices whose capacity exceeds that
of their associated pool are "oversubscribed".
Over-subscription allows presenting larger than needed devices to hosts and
applications without having the physical drives to fully allocate the space represented
by the thin devices.
Open Systems-specific provisioning
HYPERMAX host I/O limits for open systems
On open systems, you can define host I/O limits and associate a limit with a storage
group. The I/O limit definitions contain the operating parameters of the input/output
per second and/or bandwidth limitations.
When an I/O limit is associated with a storage group, the limit is equally divided among
all the directors in the masking view associated with the storage group. All devices in
that storage group share that limit.
When applications are configured, you can associate the limits with storage groups
that contain a list of devices. A single storage group can only be associated with one
limit and a device can only be in one storage group that has limits associated.
Up to 4096 host I/O limits can be defined.
Consider the following when using host I/O limits:
l
Cascaded host I/O limits controlling parent and child storage groups limits in a
cascaded storage group configuration.
l
Offline and failed director redistribution of quota that supports all available quota
to be available instead of losing quota allocations from offline and failed directors.
l
Dynamic host I/O limits support for dynamic redistribution of steady state unused
director quota.
Auto-provisioning groups on open systems
You can auto-provision groups on open systems to reduce complexity, execution time,
labor cost, and the risk of error.
Auto-provisioning groups enables users to group initiators, front-end ports, and
devices together, and to build masking views that associate the devices with the ports
and initiators.
When a masking view is created, the necessary mapping and masking operations are
performed automatically to provision storage.
Provisioning
Thin CKD 79