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8068ch06-Volumes.fm
Draft Document for Review January 29, 2013 12:52 pm
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IBM Flex System V7000 Storage Node Introduction and Implementation Guide
You can choose to map the new volumes immediately as part of the volume create wizard by
clicking Create and Map to Host. This will guide you through the Map to Host wizard
described in section 6.3, “Mapping a volume to the host” on page 261.
clicking Create and Map to Host. This will guide you through the Map to Host wizard
described in section 6.3, “Mapping a volume to the host” on page 261.
6.1.3 Creating a mirrored volume
IBM Flex System V7000 Storage Node offers the capability to mirror volumes, which means a
single volume is presented to the host, but two copies exist in the storage back end, usually in
different storage pools (all reads are handled by the primary copy). This feature is similar to
host based software mirroring such as LVM, but it provides a single point of management for
all operating systems, and provides storage high availability to operating systems that do not
support software mirroring.
single volume is presented to the host, but two copies exist in the storage back end, usually in
different storage pools (all reads are handled by the primary copy). This feature is similar to
host based software mirroring such as LVM, but it provides a single point of management for
all operating systems, and provides storage high availability to operating systems that do not
support software mirroring.
This setup lets you protect against array failures (for example, multiple disk failures) and offers
you more advanced features, as described in Chapter 9, “IBM Flex System V7000 Storage
Node Copy Services” on page 341.It also allows you to greatly improve availability, but it is not
a disaster recovery solution, due to both copies being accessed by the same node pair and
only addressable by a single cluster.
you more advanced features, as described in Chapter 9, “IBM Flex System V7000 Storage
Node Copy Services” on page 341.It also allows you to greatly improve availability, but it is not
a disaster recovery solution, due to both copies being accessed by the same node pair and
only addressable by a single cluster.
In our example below we create a mirrored volume where the first copy, placed in the Primary
Pool called
Pool called
Internal_1
, is located internally to the IBM Flex System V7000 Storage Node
disks. The second half of the mirror is placed in the Secondary Pool called
DS4300_FC_10K
and is placed externally to the IBM Flex System V7000 Storage Node on an IBM DS4300 disk
array. By using this configuration the volume is tolerant to either internal or external disk array
failure and hence does not have single point of failure.
array. By using this configuration the volume is tolerant to either internal or external disk array
failure and hence does not have single point of failure.
For more information about storage pools and how to access external storage arrays refer to
Chapter 8, “Storage pools” on page 295.
Chapter 8, “Storage pools” on page 295.
Note: An unmirrored volume can be migrated from one location to another by simply
adding a second copy to the desired destination, waiting for the two copies to synchronize,
and then removing the original copy 0. This operation can be stopped at any time. The two
copies can be in separate storage pools with separate extent sizes.
adding a second copy to the desired destination, waiting for the two copies to synchronize,
and then removing the original copy 0. This operation can be stopped at any time. The two
copies can be in separate storage pools with separate extent sizes.