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March 2013 Dell EqualLogic Configuration Guide v14.1 3-25
3 RAID policies
Each array in an EqualLogic array group is configured with a single RAID policy. Arrays (or group
members) within the same storage pool that have the same RAID policy will cooperatively work to
host volumes by distributing those volumes over multiple arrays. Two things that are defined by the
RAID policy are:
• RAID level
• hot-spare configuration
Each array implements a default RAID policy that includes a hot-spare. To configure a RAID policy that
does not include a hot-spare, you must manually initialize the array using the Command Line
Interface.
3.1 Setting the RAID Policy for a member
PS Series arrays protect data by using RAID technology and spare drives. After you add a member to a
PS Series group, you must set the RAID policy for the member. In multi-member groups, you can
assign different RAID levels to individual group members.
Once a RAID policy has been specified, the member automatically configures the disk drives according
to the designated RAID level and assigns the appropriate number of spare drives. The storage in the
member is available after you set the RAID policy, although array performance is not optimal until the
system has completed verification of the new RAID configuration.
The Remote Setup Wizard specifies the RAID policy for members when it creates a group and adds the
first member to it. See the Installation Guide for your array for information.
If you use the setup utility, you must manually configure the RAID policy as a separate step, using
either the Group Manager GUI or the CLI. See the online help or the Dell EqualLogic Group Manager
CLI Reference Guide for more information.
Note: Dell recommends against using RAID 5 for any business-critical data, although it
may be required for certain applications, depending on performance and data availability
requirements. RAID 5 can only be configured using the CLI.
Note: Configuring a RAID policy that does not include a hot-spare will increase the risk of
data loss in the event of multiple drive failures.
3.2 Guidelines for choosing a RAID policy
When specifying the RAID policy for a member, the following factors must be considered
- Dell EqualLogic 1
- Configuration Guide 1
- Abstract 2
- Revision history 3
- Introduction 10
- Audience 10
- 1 PS Series storage arrays 11
- PS4100/PS6100 16
- Active Controller 20
- Minimum cabling 20
- 1.5 Array model PS-M4110 26
- 1.5.2 Configuration options 27
- 2 Controller firmware 29
- Firmware updates 32
- 2.3.5 Linux servers 33
- 2.3.7 Environmental health 33
- 3 RAID policies 34
- 3.2.1 RAID level 35
- 3.2.2 Drive configuration 35
- 3.2.3 Spare drive policy 35
- RAID levels 36
- 4 Capacity planning 39
- 5 PS Series array concepts 45
- 5.2 Volumes 47
- 5.3 Snapshots and clones 48
- 5.4 Thin provisioning 49
- Series Group Manager 50
- 6 Array firmware features 51
- 6.1.2 Replication paths 52
- Replica Set 53
- 6.1.4 Fast failback 55
- 6.2 Synchronous replication 58
- 6.2.3 Synchronous states 59
- 6.2.4 Caveats: 59
- Figure 15 SyncRep 60
- Security 65
- 6.3.3 IPsec and Replication 66
- 6.3.7 About IPsec policies 67
- 7 EqualLogic SAN design 69
- Stacking Switches 74
- Non-Stacking Switches 74
- 7.3.2 Multi-path I/O 79
- 10GbE SANs 87
- Table 40 3-Way LAG 107
- Table 41 4-Way Stack 108
- 10 Fluid File system 112
- 10.1 FS Series architecture 113
- 10.2 Dell FluidFS 114
- 11 FS Series NAS Appliances 116
- 11.5 FS7600 components 120
- 11.6 FS7610 components 121
- 12.1 NAS cluster 122
- 12.2 NAS reserve 122
- 12.3 NAS Container 123
- 12.5.1 Snapshots 126
- 12.5.2 Replication 126
- Figure 39 NAS replication 127
- Figure 43 FS7600 network 132
- Figure 44 FS7610 network 133
- 14.1 DCB Overview 135
- 14.5 Tested SAN designs 140
- 14.5.2 ToR switch only 141
- Figure 49 ToR switch only 142
- 14.7 VLANs for iSCSI 144
- SeriesArrays 150
- Related publications 151
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