Chapter 10. Copy services 549
With volume mirroring, you can move data to different MDisks within the same storage pool or
move data between different storage pools. Using volume mirroring over volume migration is
beneficial because with volume mirroring, storage pools do not need to have the same extent
size as is the case with volume migration.
Starting with V7.3 and the introduction of the new cache architecture, mirrored volume
performance has been significantly improved. Now, lower cache is beneath the volume
mirroring layer, which means that both copies have their own cache.
This approach helps in cases of having copies of different types, for example generic and
compressed, because now both copies use its independent cache and performs its own read
prefetch. Destaging of the cache can now be done independently for each copy, so one copy
does not affect performance of a second copy.
Also, because the Storwize destage algorithm is MDisk aware, it can tune or adapt the
destaging process, depending on MDisk type and usage, for each copy independently.
10.6 Native IP replication
Before we describe Remote Copy features that benefit from the use of multiple IBM Storwize
V5000 Gen2 systems, it is important to describe the partnership option introduced with V7.2
native IP replication.
For information on implementing native IP replication and how to use it, see the separate
publication, IBM SAN Volume Controller and Storwize Family Native IP Replication,
REDP-5103.
10.6.1 Native IP replication technology
Remote Mirroring over IP communication is supported on the IBM SAN Volume Controller
and Storwize Family systems by using Ethernet communication links. The IBM Spectrum
Virtualize Software IP replication uses innovative
Bridgeworks SANSlide technology to
optimize network bandwidth and utilization. This new function enables the use of a
lower-speed and lower-cost networking infrastructure for data replication.
Bridgeworks’ SANSlide technology, which is integrated into the IBM Spectrum Virtualize
Software, uses artificial intelligence to help optimize network bandwidth use and adapt to
changing workload and network conditions.
Migration: While these migration methods do not disrupt access, you must take a brief
outage to install the host drivers for your IBM Storwize V5000 Gen2 system if you do not
already have them installed.
Note: Volume mirroring does not create a second volume before you split copies. Volume
mirroring adds a second copy of the data under the same volume, so you end up having
one volume presented to the host with two copies of data connected to this volume. Only
splitting copies creates another volume, and then both volumes have only one copy of
the data.
To Next Page
Loading...
Need help?
General