SG0-001 · Question #283
A customer with sixteen non-clustered SAN attached hosts has a storage subsystem with thirty- two disk drives. The customer wishes to protect their data using RAID 1. Each server has a need to see thr
The correct answer is D. separate logical units for each server volume. To provide each of 16 servers with three distinct, RAID 1 protected volumes from a SAN storage subsystem, the storage must be configured to present each of these required volumes as separate Logical Unit Numbers (LUNs).
Question
A customer with sixteen non-clustered SAN attached hosts has a storage subsystem with thirty- two disk drives. The customer wishes to protect their data using RAID 1. Each server has a need to see three separate volumes for their final configuration. What must be configured on the storage subsystem to meet their storage allocation needs?
Options
- Amultiple scsi targets to each mirror volume
- Bsingle logical unit and use host-based LVM
- Cseparate virtual paths for each mirror volume
- Dseparate logical units for each server volume
How the community answered
(44 responses)- A11% (5)
- B2% (1)
- C7% (3)
- D80% (35)
Why each option
To provide each of 16 servers with three distinct, RAID 1 protected volumes from a SAN storage subsystem, the storage must be configured to present each of these required volumes as separate Logical Unit Numbers (LUNs).
SCSI targets are typically associated with storage controllers or ports, not directly assigned multiple times to a single mirror volume; a volume (LUN) is exported from a target.
If only a single logical unit is presented from the storage subsystem, the host would see only one large volume, and while host-based LVM could subdivide it, the storage subsystem itself would not be meeting the requirement for 'three separate volumes' from its perspective.
Virtual paths refer to the connectivity within the SAN fabric (e.g., Fibre Channel paths) and are related to I/O routing and multipathing, not the fundamental configuration of how distinct logical storage volumes (LUNs) are defined and allocated on the storage subsystem itself.
To fulfill the requirement of each server seeing three separate volumes, the storage subsystem must provision and expose three distinct Logical Units (LUNs) for each server, as LUNs are the fundamental unit of storage allocation and presentation from a SAN array to hosts.
Concept tested: SAN storage provisioning - LUNs, RAID, host visibility
Source: https://www.snia.org/education/what-is-a-lun
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