フリー問題

問題文

A storage administrator must explain what happens to host access when one controller of a FlashArray is taken offline for a Purity upgrade. Which description of the array behavior during that window is correct?

選択肢

1. Host access pauses until the upgraded controller rejoins because only one controller can own a given volume at a time.
2. Host access continues but each new write stays in host memory until the second controller confirms that it landed on flash.
3. The surviving controller keeps serving all host I/O because both controllers are active and acknowledged writes sit in NVRAM.
4. Host access must be quiesced by the administrator in advance so that writes in flight are not lost while the controller reboots.