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Technical white paper | HP Enterprise Virtual Array Storage and VMware vSphere 4.x and 5.x configuration best practices
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Figure 12 below, shows the iSCSI target to GbE port connections from a single 1GbE iSCSI Module perspective on one array
controller.
Figure 12. Logical view of iSCSI target connection to GbE ports – Single controller view.
From an ESX host perspective, ESX has the proper NIC redundancy and will detect its maximum of eight paths per LUN. If NIC
1 (port 1 in Figure 12) failed, I/O would be failed over to an available iSCSI target through NIC 2 (port 2 in Figure 13).
However, from an array perspective, all paths to LUNs are built through iSCSI targets on the same controller. If this
controller was to fail or reboot, the host would lose all access to storage because the maximum number of paths was
exhausted through access to controller 1 and no paths to LUNs were built using the paths through controller 2.
When using an EVA with a 1GbE iSCSI Module option and all GbE ports must be attached to the iSCSI SAN, it is recommended
to use Static discovery on the ESX side and manually select which iSCSI targets will be exposed to ESX for LUN access.
Alternatively, a more adequate high availability configuration is shown in Figure 14 below where only two GbE ports per
controller are attached to the iSCSI SAN and two NICs are used in the host.
Figure 13. Logical view of iSCSI target connection to GbE ports – Dual controller view.
In this configuration, iSCSI Dynamic discovery can be used to enable ease of deployment while ensuring proper high
availability.
In an EVA with a 1GbE iSCSI Module option configuration, high availability via redundant paths is dependent on the following
factors:
• The number of NIC adapters in the host accessing the iSCSI SAN
• The number of iSCSI targets exposed to the iSCSI SAN
• The iSCSI discovery type used
Table 2 below provides guidance to select the right number of paths at the host and at the array to maintain proper high
availability in a 1GbE iSCSI Module configuration with two distinct SANs as shown in Figure 10.
- HP Enterprise Virtual Array 1
- Storage and VMware vSphere 1
- Executive summary 4
- The challenges 4
- Key concepts and features 4
- ALUA compliance 5
- Configuring EVA arrays 6
- Using Command View EVA 7
- Disk group provisioning 13
- Vdisk provisioning 16
- • EVA Controllers 18
- Controller connections 20
- Front-end GbE and FC ports 20
- • Fixed_AP 24
- • Round robin 24
- • Fixed 24
- • Configure the Vdisk 25
- Configuring multi-pathing 27
- • SATP 28
- Displaying the SATP list 29
- Disk Group 33
- DR Group 33
- Upgrading EVA microcode 34
- Using VMFS 35
- Using RDM 35
- Comparing supported features 36
- Sizing the vSphere cluster 38
- Aligning partitions 38
- Optimizing queue depth 39
- Using adaptive queuing 39
- Optimizing I/O size 42
- • Plugin-less deployment 44
- VAAI operation concurrency 46
- ESX UNMAP support history 47
- UNMAP in ESXi 5.5 49
- Summary of best practices 51
- Summary 53
- Glossary 53
- Changing the default PSP 56
- Figure C-2. I/O routes 58
- Sample configuration 62
- Configuring the vSphere host 64
- Configuring the array 68
- Configuring the VM 69
- For more information 71
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