Pure Storage FlashArray-Storage-Professional Questions Answers

When physical links fail to establish—especially when using Direct Attach Copper (DAC) cables or Twinax—the most common culprit is a hardware compatibility mismatch. Pure Storage arrays have specific requirements for optics and cabling to ensure optimal signal integrity and performance.

The FlashArray Transceiver and Cable Support article (available on the Pure Storage Support portal) is the authoritative, verified resource for this scenario. It provides a comprehensive, constantly updated compatibility matrix detailing exactly which vendor DAC cables (e.g., Cisco, Brocade, Arista) and transceivers are officially validated and supported for use with specific FlashArray models and port types. If an unsupported DAC cable is used, the switch or host bus adapter (HBA) on the array might simply refuse to bring the link up.

Here is why the other options are incorrect for this specific issue:

The FlashArray User Guide (A): This guide is excellent for day-to-day administration (volume creation, host grouping, etc.) but is too broad to contain granular, constantly updating hardware compatibility matrices for specific cables.

The Port Usage and Definitions article (C): This document explains the logical and physical purpose of the ports on the back of the controllers (e.g., defining which ports are used for management, replication, or host connectivity), but it does not dictate hardware transceiver or cable interoperability.

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.