46 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
/SM590000Define subnets for the Storwize V7000 system and for the hosts for internet Small 
Computer System Interface (iSCSI) connectivity.
/SM590000Define the IP addresses for IP replication (if required).
/SM590000Define back-end storage that will be used by the system.
/SM590000Define the managed disks (MDisks) in the back-end storage to be used by Storwize 
V7000.
/SM590000Define the storage pools, specify MDisks for each pool and document mapping of MDisks 
to back-end storage. Parameters of the back-end storage determine the characteristics of 
the volumes in the pool. Make sure that each pool contains MDisks of similar (ideally, 
identical) performance characteristics.
/SM590000Plan allocation of hosts and volumes to I/O Groups to optimize the I/O load distribution 
between the hosts and the Storwize V7000. Allowing a host to access more than one I/O 
group might better distribute the load between system nodes. However, doing so reduces 
the maximum number of hosts that are attached to the Storwize V7000.
/SM590000Plan queue depths for the attached hosts. For more information, see this website.
/SM590000Plan for the physical location of the equipment in the rack.
/SM590000Verify that your planned environment is a supported configuration.
/SM590000Verify that your planned environment does not exceed system configuration limits.
Planning activities required for Storwize V7000 deployment are described next.
3.2  Planning for availability
When planning deployment of IBM Storwize V7000, avoid creating single points of failure. 
Plan system availability according to the requirements specified for your solution. Consider 
the following aspects, depending on your availability needs:
/SM590000Single site or multi-site configuration
Multi-site configurations increase solution resiliency and can be the basis of disaster 
recovery solutions. Storwize V7000 allows configuration of multi-site solutions, with sites 
working in active-active or active-standby mode. Synchronous and asynchronous data 
replication is supported by multiple inter-site link options.
For more information about cross-site configurations, see IBM Storwize V7000, Spectrum 
Virtualize, HyperSwap, and VMware Implementation, SG24-8317. 
/SM590000Physical separation of system building blocks
Dual rack deployment might increase availability of your system if your back-end storage, 
SAN, and LAN infrastructure also do not use single rack placement scheme. You can 
further increase system availability by ensuring that cluster nodes are powered from 
different power circuits and are in different fire protection zones.
/SM590000Quorum availability
The Storwize V7000 uses three drives that are configured as array members or hot 
spares, as quorum disks for the clustered system. If no external MDisks can be used as 
quorum disks, the preferred practice is to distribute quorum disks over SAS channels to 
increase system resiliency. The current locations of the quorum disks can be displayed by 
using the lsquorum command, and relocated by using the chquorum command.