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| Section | Objectives |
|---|---|
| Topic 1: Data Protection and Availability | - Snapshot and protection strategies
|
| Topic 2: Installation and Initial Configuration | - Host connectivity
|
| Topic 3: Monitoring, Performance, and Troubleshooting | - Troubleshooting
|
| Topic 4: FlashArray Architecture and Core Concepts | - FlashArray hardware and architecture overview
|
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NEW QUESTION # 135
What command will view NVRAM install and update status?
Answer: B
Explanation:
The command purehw list --all displays detailed hardware information, including NVRAM installation and update status on the FlashArray.
NEW QUESTION # 136
An Implementation Engineer is getting ready to install four DFMs into a 16-module efficiency bundle and notices that the new modules are DFMDs while the installed modules are DFMs.
What should the Implementation Engineer do to get the array using a 20-module wide write group?
Answer: B
Explanation:
Understanding the strict hardware boundaries of Pure Storage capacity expansion is critical. DirectFlash Modules (DFMs) and DirectFlash Modules with Distributed NVRAM (DFMDs) are fundamentally different hardware components. Standard DFMs contain only raw NAND flash and rely entirely on centralized, dedicated NVRAM modules located in the array chassis to protect write cache. DFMDs, however, feature their own onboard non-volatile memory to distribute the cache load across the capacity drives (primarily utilized in //XL and //XR4 architectures).
Pure Storage architecture explicitly dictates that drives operating within a single efficiency bundle or Wide Write Group (WWG) must be of the exact same hardware classification to ensure predictable parity calculation, wear leveling, and cache distribution. Mixing legacy DFMs with newer DFMDs within the same
20-module write group creates a severe hardware imbalance and is a strictly unsupported configuration.
While internal engineering tunables (like those suggested in Option A) occasionally exist to force overrides in lab environments, applying them in a customer's production array to bypass physical hardware incompatibility violates all implementation best practices. The only correct and safe action for the Implementation Engineer is to halt the physical installation, flag the Bill of Materials (BOM) mismatch, and work with the account
/logistics team to RMA the DFMDs and ship the correct standard DFMs.
NEW QUESTION # 137
An Implementation Engineer is onsite to add a new 91TB (10 x 9.1TB) data pack to a FlashArray that includes a DirectFlash Shelf. The chassis currently contains two write groups, one 45TB (10 x 4.5TB) and one
91TB (10 x 9.1TB). The shelf contains a single 45TB (10 x 4.5TB) write group. The customer requests that the new data pack be added as part of a wide write group. How should the Implementation Engineer meet this request?
Answer: C
Explanation:
FlashArray performance and capacity management rely on "Write Groups"-logical groupings of drives that Purity uses to stripe data. A "Wide Write Group" typically consists of roughly 20 drives and offers better performance and capacity efficiency than smaller groups. However, Purity generally requires write groups to be contained within a single physical enclosure (chassis or shelf) to maintain failure domain boundaries and performance predictability.
In this scenario, the customer wants the new 91TB pack to form a wide write group. The chassis already has a
91TB group and a 45TB group. The shelf has one 45TB group. To create a wide write group with the new
91TB pack, it is best to pair it with an existing matching or compatible group in the same enclosure. Since the chassis is full (20 drives), you cannot simply add the new pack there without moving something.
The correct procedure is to move the 45TB write group from the chassis to the shelf . This frees up 10 slots in the chassis. The shelf now holds two 45TB groups (which is valid). The chassis now has the original 91TB group and 10 empty slots. The engineer can then install the new 91TB data pack into those empty chassis slots. Purity will then be able to merge or manage these two 91TB packs (the existing one and the new one) as a highly efficient configuration, potentially forming the requested wide write group or at least balancing the high-capacity drives within the controller chassis where bandwidth is highest. This physical rearrangement is necessary because write groups cannot span across the chassis-shelf interconnect.
=========
NEW QUESTION # 138
During a hardware NDU from a FlashArray//X20R3 to an X20R4-LL (low-line) model, the Implementation Engineer encounters a failure during the power supply check. Voltage readings are correct. What is a likely cause of this failure?
Answer: B
Explanation:
The FlashArray//X20R4-LL (Low-Line) model is a specific configuration designed for lower capacity and power entry points. Unlike the standard //X or //XL models which can support fully populated chassis and shelves, the "Low-Line" configurations often come with strict hardware limitations regarding power draw and drive count. A known constraint for specific Low-Line chassis upgrades, particularly when moving to the X20R4-LL, is a limitation on the number of DirectFlash Modules (drives) supported due to the power supply unit (PSU) capacity or thermal design targeted for that specific SKU.
In this scenario, if the source array (X20R3) was populated with more drives than the target X20R4-LL supports-specifically more than 10 drives-the upgrade validation checks (such as those performed by the upgrade script or Purity health checks) will flag a failure. Even though the voltage readings are technically correct (indicating the PDUs are providing power), the check fails because the hardware configuration exceeds the supported power budget for that specific chassis model.
Implementation Engineers must verify the drive count of the source array against the specifications of the target "Low-Line" array during the planning phase. If the source array has 11 or more drives, the target hardware cannot be an LL model; it would require a standard model to support the additional power load of the extra drives. This check prevents the array from booting into a state where it might experience power contention or thermal shutdown under load.
=========
NEW QUESTION # 139
What command will view NVRAM install and update status?
Answer: B
Explanation:
The command purehw list --all displays detailed hardware information, including NVRAM installation and update status on the FlashArray.
NEW QUESTION # 140
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