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March 2013 Dell EqualLogic Configuration Guide v14.1 6-49
Table 21 Firmware replication compatibility
Firmware of “Local” Group
Firmware on Replication Partner
V6.0
V5.1.x, V5.2.x, V6.0.x
V5.1.x, V5.2.x V5.0.x, V5.1.x, V5.2.x
V5.0.x
V4.2.x, V4.3.x, V5.0.x, V5.1.x, V5.2.x
V4.2.x, V4.3.x
V4.1.x, V4.2.x, V4.3.x, V5.0.x
V4.1.x
V4.0.x, V4.1.x, V4.2.x, 4.3.x
V4.0.x
V3.2.x, V3.3.x, V4.0.x, V4.1.x, V4.2.x
V3.2.x, V3.3.x
V3.0.x, V3.1.x, V3.2.x, V3.3.x, V4.0.x
V3.0.x, V3.1.x
V3.0.x, V3.1.x, V3.2.x, V3.3.x
6.1.8 Clustering
To support a shared storage environment, EqualLogic allows concurrent access to any volume.
Concurrent volume access is enabled on a per volume basis within the Group Manager or via CLI. The
EqualLogic array will not manage concurrent access to these volumes. Control of access to a shared
volume must be provided by means of access control software on each host that has access to the
volume.
Warning: Failure to provide access control to a shared volume can result in data loss.
By default, EqualLogic PS Series groups disable multi-host (shared) access to target.
• If needed, you can enable multi-host access for a volume.
• If you enable multi-host access to a volume, then proper I/O operation concurrency must be
maintained.
6.2 Synchronous replication
6.2.1 About Synchronous replication
Synchronous replication (SyncRep) is the simultaneous writing of volume data across two different
storage pools in the same PS Series group, resulting in two hardware-independent copies of volume
data. Each write must go to both pools before the write is acknowledged as complete. If one pool is
not available due to a power failure or resource outage, you still can obtain volume data from the
other pool.
You cannot perform traditional replication on a SyncRep-enabled volume.
6.2.2 How Synchronous replication works
SyncRep is enabled on a per-volume basis. In volumes for which SyncRep is not enabled, volume data
and snapshots are located only in the pool to which the volume is assigned.
- 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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