FlashArray-Storage-Professional Exam Dumps : Pure Certified FlashArray Storage Professional

Understanding CRC Errors: CRC (Cyclic Redundancy Check) errors occur when the data received at a port does not match the checksum sent by the initiator or switch. In a Pure Storage environment, these are tracked per port and can be viewed via the CLI (purehw list) or the GUI.

Configuration vs. Hardware: While a failing SFP or a damaged fiber cable can cause CRC errors, they are a primary indicator of configuration mismatches in the SAN fabric. Common culprits include:

Port Speed Mismatches: Manually setting a port to 16Gbps when the switch is set to " Auto " or 8Gbps.

Duplex Mismatches: Though rare in modern Fibre Channel, it is a classic Ethernet/iSCSI configuration error.

MTU Mismatches: In iSCSI or NVMe-oF environments, if the FlashArray is configured for Jumbo Frames (MTU 9000) but the switch or host is at MTU 1500, packet fragmentation or CRC-like errors/drops will occur.

Why Option A is incorrect: A blinking status LED on a controller is often part of normal operation (indicating heartbeat or activity). A solid amber LED would be an indicator of a hardware failure, not necessarily a misconfiguration.

Why Option C is incorrect: While latency spikes can be caused by misconfiguration (like incorrect MPIO settings), they are more commonly symptoms of workload changes , " noisy neighbors, " or reaching the physical performance limits of the array. CRC errors are a much more specific diagnostic " smoking gun " for port and fabric configuration issues.

Best Practice: When CRC errors are detected, Pure Storage recommends first checking the physical layer (reseating SFPs/cables) and then verifying that the port speed and protocol settings on the FlashArray match the upstream switch configuration exactly.

On a Pure Storage FlashArray, " System Space " is a specific GUI-reported metric. Purity has a predefined, hidden internal space budget—typically around 20% of the raw mapped capacity (which would be 2TB on a 10TB array)—reserved for internal array operations. This budget covers RAID/parity overhead, metadata, and reclaimable space (data from deleted volumes, snapshots, or overwritten blocks that are waiting for the backend garbage collection process to fully erase them from the flash chips).

Normally, this internal overhead stays below the 20% budget, and " System Space " displays as 0.00 in the GUI. However, if an administrator deletes a massive amount of data at once, causing the reclaimable space to exceed that 2TB budget, the overflow is prominently displayed in the GUI as " System Space. "

Here is why the other options are incorrect:

Virtual machines have not yet issued an unmap command (A): If a VMware VM deletes a file but the OS hasn ' t issued an UNMAP/TRIM command, the FlashArray is completely unaware that the data was deleted. Therefore, the array continues to report that capacity as standard Volume Space , not System Space.

More than 2TB of volume snapshots were destroyed (C): While destroying snapshots leads to reclaimable space, " reclaimable space " (Option B) is the specific, correct Purity architectural term and metric that the system uses to calculate the internal budget threshold.

When configuring NVMe/TCP (or iSCSI) for optimal performance on a Pure Storage FlashArray, configuring Jumbo Frames (an MTU of 9000) end-to-end is a standard best practice.

The command ping -M do -s 8972 < ip_addr > is specifically used to verify Jumbo Frame configuration across the network.

The -M do flag sets the " Do Not Fragment " (DF) bit, meaning the network is not allowed to break the packet into smaller pieces.

The -s 8972 flag sets the ICMP data payload to 8972 bytes. When you add the standard 8-byte ICMP header and the 20-byte IP header, the total packet size equals exactly 9000 bytes.

If this ping command fails, it indicates that somewhere along the network path between the host (initiator) and the FlashArray (target), a switch port, router, or network interface is not configured to support an MTU of 9000. The packet is being dropped because it is too large and cannot be fragmented. The administrator must verify the MTU settings on every network hop (switches, routers, and host NICs) to resolve the issue.

Here is why the other options are incorrect:

Engage support to enable NVME/ TCP services (A): The failure of a Jumbo Frame ping test is a Layer 2/Layer 3 network configuration issue, not an indicator that the NVMe/TCP storage protocol service is disabled on the array.

Run the command from the target (C): While pinging from the FlashArray back to the host is a valid secondary troubleshooting step, it will likely also fail if the network path doesn ' t support Jumbo Frames. The actual resolution is to fix the MTU on the network hops.