1Y0-301 · Question #35
Scenario: A Citrix Engineer needs to configure iSCSI based shared storage for XenServer with multi-pathing. The iSCSI SAN has two targets: one on subnet 10.10.10.x and one on subnet 10.10.20.x. How…
The correct answer is B. Create management interfaces on each storage subnet. To enable iSCSI multi-pathing when SAN targets reside on two separate subnets, the XenServer host must have a dedicated management interface on each storage subnet so it can route to both targets independently.
Question
Scenario: A Citrix Engineer needs to configure iSCSI based shared storage for XenServer with multi-pathing. The iSCSI SAN has two targets: one on subnet 10.10.10.x and one on subnet 10.10.20.x. How should the engineer configure iSCSI-based shared storage for XenServer with multi- pathing?
Options
- ACreate two virtual private networks.
- BCreate management interfaces on each storage subnet.
- CCreate VLAN tagging on two NICs attached to the iSCSI networks.
- DCreate a bonded network for bonded NICs across all storage subnets.
How the community answered
(23 responses)- A4% (1)
- B65% (15)
- C9% (2)
- D22% (5)
Why each option
To enable iSCSI multi-pathing when SAN targets reside on two separate subnets, the XenServer host must have a dedicated management interface on each storage subnet so it can route to both targets independently.
Virtual private networks (VPNs) are not the mechanism used to connect XenServer hosts to iSCSI storage targets on local subnets; they would add unnecessary complexity and latency.
XenServer iSCSI multi-pathing requires that the host can communicate with each iSCSI target on its respective subnet. Creating a dedicated management interface (secondary interface) on each storage subnet - 10.10.10.x and 10.10.20.x - gives the host a local IP on each network, allowing the iSCSI initiator to establish independent paths to each target. This is how XenServer achieves true multi-path I/O across subnets.
VLAN tagging isolates traffic at Layer 2 within a single physical NIC but does not provide the separate routable IP addresses on each subnet that iSCSI multi-pathing across two subnets requires.
NIC bonding aggregates NICs into a single logical interface on one network, which contradicts multi-pathing across two distinct subnets and would not provide separate paths to each target.
Concept tested: XenServer iSCSI multi-path storage network interface configuration
Source: https://docs.citrix.com/en-us/citrix-hypervisor/storage/iscsi.html
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