Huawei OceanStor 2000 V3 Series Features Manual page 112

OceanStor V3 Series
HyperMetro Feature Guide for File
Issue 05 (2018-01-30)
Parameter Description
Capacity A storage system supports the following
Autonegotiati capacity autonegotiation policies:
on Policy
– Not Use Capacity
Autonegotiation: The storage
capacity used by a file system is
fixed and is not flexibly adjusted by
the storage system.
– Auto Expand Capacity: increases
file system capacity and meets users'
requirements in data write when the
available space of a file system is
about to run out and the storage pool
has available space.
– Auto Reduce or Expand Capacity:
The storage system automatically
adjusts the file system capacity
based on file system space usage.
When the available space of a file
system is about to run out and the
storage pool has available space,
automatic capacity expansion will
be used to increase file system
capacity. When the file system's
storage space is released, it can be
reclaimed into a storage pool and
used by other file systems in data
write requests.
Capacity A storage system supports the following
Reclamation capacity reclamation modes:
Mode
– Preferentially Expand Capacity:
Expand the capacity to increase the
file system capacity.
– Preferentially Delete Old
Snapshot: Delete old snapshots to
reclaim space for increasing the file
system capacity. If
HyperReplication and HyperMetro
are configured for storage systems,
the capacity autonegotiation policy
of the primary storage system will
be synchronized to the secondary
storage system. If Preferentially
Delete Old Snapshot is adopted,
ensure that Delete Obsolete Read-
Only Snapshots is enabled for the
secondary storage system.
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4 Configuration
Value
[Example]
Auto Expand Capacity
[Default]
Not Use Autonegotiation
[Example]
Preferentially Expand
Capacity
[Default]
Preferentially Expand
Capacity
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