Expanding storage for EVA arrays using Command View EVA
Presenting a virtual disk offers its storage to a host. To make a virtual disk available to a host, you must
present it. You can present a virtual disk to a host during or after virtual disk creation. The virtual disk
must be completely created before the host presentation can occur. If you choose host presentation
during virtual disk creation, the management agent cannot complete any other task until that virtual
disk is created and presented. Therefore, HP recommends that you wait until a virtual disk is created
before presenting it to a host.
For more information, see the
HP StorageWorks Command View EVA User Guide
.
Expanding storage using the Array Con
fi
guration Utility
The Array Con
fi
guration Utility enables online capacity expansion of the array and logical drive for
speci
fi
c MSA storage arrays, such as the MSA1000 and MSA1500. For more information, use the ACU
online help, or the procedures to “Expand Array” in the
Array Con
fi
guration Utility User Guide
Expand logical drive
This option in the ACU increases the storage capacity of a logical drive by adding unused space on an
array to the logical drive on the same array. The unused space is obtained either by expanding an array
or by deleting another logical drive on the same array. For more information, use the ACU online help, or
the “Extend logical drive” procedure in the
Array Con
fi
guration Utility User Guide
Volume shadow copies
NOTE:
Select storage servers can be deployed in a clustered as well as a non-clustered con
fi
guration. This
chapter discusses using shadow copies in a non-clustered environment.
The Volume Shadow Copy Service provides an infrastructure for creating point-in-time snapshots (shadow
copies) of volumes. Shadow Copy supports 64 shadow copies per volume.
A shadow copy contains previous versions of the
fi
les or folders contained on a volume at a speci
fi
c
point in time. While the shadow copy mechanism is managed at the server, previous versions of
fi
les
and folders are only available over the network from clients, and are seen on a per folder or
fi
le level,
and not as an entire volume.
The shadow copy feature uses data blocks. As changes are made to the
fi
le system, the Shadow Copy
Service copies the original blocks to a special cache
fi
le, to maintain a consistent view of the
fi
le at a
particular point in time. Because the snapshot only contains a subset of the original blocks, the cache
fi
le is typically smaller than the original volume. In the snapshot's original form, it takes up no space
because blocks are not moved until an update to the disk occurs.
By using shadow copies, a storage server can maintain a set of previous versions of all
fi
les on the
selected volumes. End users access the
fi
le or folder by using a separate client add-on program, which
enables them to view the
fi
le in Windows Explorer. Accessing previous versions of
fi
les, or shadow
copies, enables users to:
•
Recover
fi
les that were accidentally deleted. Previous versions can be opened and copied to
a safe location.
•
Recover from accidentally overwriting a
fi
le. A previous version of that
fi
le can be accessed.
•
Compare several versions of a
fi
le while working. Use previous versions to compare changes
between two versions of a
fi
le.
Shadow copies cannot replace the current backup, archive, or business recovery system, but they can
help to simplify restore procedures. Because a snapshot only contains a portion of the original data
blocks, shadow copies cannot protect against data loss due to media failures. However, the strength
44
File server management
Summary of Contents for DL320s - ProLiant 9TB SATA Storage Server NAS
Page 14: ...14 About this guide ...
Page 28: ...28 Installing and configuring the server ...
Page 36: ...36 Storage management overview ...
Page 68: ...68 File server management ...
Page 74: ...74 Print services ...
Page 96: ...96 Enterprise storage servers ...
Page 120: ...120 Troubleshooting servicing and maintenance ...
Page 122: ...122 System recovery ...