Installation manual

MetaLUN settings
Table 3 describes the user-defined and default parameters for metaLUNs
Table 3. MetaLUN settings
Set Default setting Notes
LUN Expansion
Type of expansion Striping Striping The user will need to wait for the
striping to complete before the space
can be made available to the host.
Select LUN All LUNs that meet the rules will be
displayed. Select one LUN.
User capacity GB GB This part of the capacity represents the
units of measure.
User capacity (size) Maximum
capacity
Maximum capacity
MetaLUN name Follow
customer
naming
practices
Same as base LUN
name
Can be changed during the creation of
the metaLUN
Default owner Current SP Current SP The default will be the same as the
current owner of the base LUN.
Expansion rate ASAP Default
Element multiplier default 4 This sets the largest I/O a single LUN
can receive within a metaLUN
Alignment offset default Current setting See section on creating LUNs for
description.
Enable Auto Assign default Box unchecked
RAID type to file type match
Most customer applications should be using RAID 5. This provides the best reliability and
performance at the most cost-effective level. Variations from RAID 5 may occur based on the
application profile.
Application profiles
EMC strongly recommends protected RAID for all applications.
There are four main factors that affect the configuration:
• Capacity – How much space is required?
 Small environments: up to 4 TB
 Medium environments: 4 – 11 TB
 Large environments: 11+TB
Your view of these ratings may vary, but the basis for these choices is:
 A small configuration is one to two DAEs.
 A medium configuration is two to eight DAEs with ATA drives.
 A large configuration covers the rest.
• Throughput – How many I/Os per second (IOPS) will the load generate? Small I/O
sizes can generally generate more IOPS than large I/O sizes.
• Bandwidth – How much data—in megabytes per second (MB/s)—will the load
generate? Small I/O sizes tend not to move as much data as large I/O sizes.
Dell/EMC CX Series Initial Configuration
Best Practices Planning 11