DELL PowerVault MD3200i/MD3220i Technical Guide Book
based, it requires no host interaction or CPU cycles – minimizing the impact to applications and the
storage infrastructure.
Virtual disk copy can be used in conjunction with virtual disk snapshot – which creates a PiT image of a
virtual disk while maintaining read / write access – enabling a complete PiT clone to be created
without interrupting the I/O activity of the production virtual disk. Additionally, virtual disk copy can
be used to redistribute data – moving virtual disks from older, slower disk physical disks to newer,
faster, or higher capacity physical disks – to optimize application performance and/or capacity
utilization.
Online Administration
The MD3200i series of storage arrays allows primary storage management tasks to be performed while
the storage remains online with complete read/write data access. This allows storage administrators
to make configuration changes, conduct maintenance, or expand the storage capacity without
disrupting I/O to its attached hosts. Online capabilities include:
•
Add Free Capacity
Capacity Expansion enables the capacity and number of physical disks to be increased for a given
disk group. Up to two physical disks at a time can be added to existing disk groups, with the
existing virtual disks then being striped across the full set of physical disks now comprising the disk
group.
•
Dynamic Expansion
This feature enables new drive modules to be added, virtual disk groups to be configured, and
virtual disks to be created without disrupting access to existing data. Once a newly created virtual
disk is defined, the array provides immediate virtual disk availability and is enable it to be instantly
mapped and accessed by a host(s).
•
Dynamic Virtual Disk Expansion
This feature allows for the capacity expansion of an existing virtual disk by using the free capacity
on an existing virtual disk group. And since dynamic virtual disk expansion concatenates (combines)
the new capacity with the original capacity, maximum performance and utilization is assured.
•
Dynamic RAID Level Migration
This level of migration changes the RAID level of a virtual group on the existing drives, without
requiring the relocation of data. With this dynamic feature, customers can easily adjust RAID levels
when their application, availability, or performance needs change.
•
Dynamic Segment Size Migration
With this feature, the segment size of a given virtual disk can be dynamically changed.
•
Dynamic Defragmentation
Dynamic defragmentation allows the user to rearrange virtual disks and consolidates free capacity
within a virtual disk group resulting in optimized access patterns for existing and newly created
volumes.
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