Technical Guide Book for PowerVault MD3200MD3220
background operation with five user-defined priority settings, enabling administrators to minimize either
copy time or the overall I/O impact to the storage system. As virtual disk copy is controller 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 MD3200 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.
Non-disruptive firmware upgrades
Enables controller firmware upgrades to occur with no interruption to data access. The new firmware is
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