HP Advanced HPE Storage Architect Written Exam HPE7-J01 Question # 18 Topic 2 Discussion
HPE7-J01 Exam Topic 2 Question 18 Discussion:
Question #: 18
Topic #: 2
A customer intentionally removes all three drives from a JBOF from an HPE Alletra MP X10000 used in an HPE GreenLake for File Storage solution. What is the correct description of the result of this action?
A.
This results in the start of a rebuild on an integrated spare drive. After the rebuild/resync of the spare is complete, data services will be available and I/O will continue.
B.
This results in a catastrophic failure with an I/O outage, as no data service is available and the system is not in RO mode. To recover, the customer should reinsert the same three drives, which will recover the system.
C.
This results in a catastrophic failure, with an I/O outage as no data service is available and the system is not in RO mode. To recover, HPE support/engineering needs to be involved and try the recovery steps.
D.
This results in the start of a rebuild on an integrated spare drive. After the rebuild/resync of the spare is complete, the customer must contact HPE support/engineering to complete the process.
The HPE Alletra MP X10000, which powers HPE GreenLake for File Storage, utilizes a disaggregated shared-everything (DASE) architecture based on VAST Data software. Unlike traditional RAID, this architecture uses highly advanced locally decodable erasure coding.
While the system is designed to be incredibly resilient—often surviving multiple concurrent drive failures across the cluster—the removal of three drives simultaneously from a single JBOF (Just a Bunch of Flash) chassis can exceed the immediate "vertical" stripe protection thresholds, especially in smaller cluster configurations. In the Alletra MP File architecture, the metadata and data are distributed with specific redundancy parameters. Intentionally pulling three drives at once is treated as a multi-point catastrophic failure rather than a standard drive wear-out event.
When such an event occurs, the system enters a "Fail-Stop" state to protect data integrity and prevent file system corruption. Because the system cannot guarantee the consistency of the data stripes or the underlying V-Trees (metadata structures), it will cease I/O services. Simply reinserting the drives (Option B) will not automatically bring the file system back online because the system likely marked those drives as "failed" or "stale" the moment they were removed. Recovery requires HPE Level 3 Support and Engineering to perform a manual "forced mount" or metadata reconstruction process to verify that no partial writes occurred during the removal. This is a high-touch recovery scenario designed to ensure that when the data becomes available again, it is 100% consistent.
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