H3C GB0-621 Certification Exam Sample Questions and Answers

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H3C GB0-621 (H3CS-UIS) Sample Questions:

01. Checking firmware levels and component compatibility is treated as a routine maintenance activity on a UIS Standard Edition cluster rather than a one-off deployment step.
Why does it belong in the routine?
a) The pool reads each node's firmware level when it chooses which node serves a request, so a mismatch pulls client traffic away from the nodes that have not been updated recently.
b) Compatibility is verified when a node is first admitted, so the routine check exists to cover the nodes from the original deployment.
c) Hardware and the software layers above it are both replaced and updated over time, so a combination that was verified at deployment may no longer hold today.
d) The management layer refuses to start an upgrade until every node reports the same firmware level, so the routine check is what keeps upgrades from being rejected.
 
02. A UIS Standard Edition HCI cluster has just been expanded from three nodes to five, and its pool is configured for two replicas. The operations team proposes raising the pool to three replicas in the same maintenance window as the expansion.
What is the substantive objection to doing it in that window?
a) Three replicas become available only once a pool exceeds five nodes in its configuration, so the operation would be rejected until an additional node has been introduced.
b) The expansion is already moving data across the back-end network, and a third copy of everything on top of it lengthens the period in which the pool is redistributing rather than settled.
c) Raising the replica count applies only to data written afterwards, so the volumes that already exist would stay on two copies and the pool would hold two policies at once.
d) Raising the replica count changes the fault domain from host level to rack level, so the cluster's racks would have to be declared before the pool would accept the setting.
 
03. In a four-node UIS Standard Edition HCI cluster running two replicas, a data disk was reported as failed. An engineer pulled and replaced it straight away, while the pool was still recovering the data that disk had held.
What is the significant risk that this created?
a) For part of the recovery, some of the affected data was held on a single surviving replica, so a further disk or node failure in that window could have lost it.
b) For part of the recovery, the back-end network carried both the rebuild and the initialization of the replacement disk, so the recovery finished later than it otherwise would have.
c) For part of the recovery, the pool's configured replica count was automatically lowered to one, so the setting had to be raised again once the replacement was in place.
d) For part of the recovery, the pool served reads from the replacement disk before it held data, so applications could have been given stale content.
 
04. A UIS Standard Edition HCI cluster is being expanded by adding data disks to one of its existing storage nodes.
Which two conditions should be confirmed on that node before the disks are added?
(Choose two.)
a) The pool's fault domain has been switched to per-rack, placing the added disks in a different domain from the ones already present.
b) Each added data disk is presented to the node individually and not grouped behind a controller-level redundancy set.
c) The node still meets the processor and memory budget the platform expects of a storage node once the added disks are counted in.
d) The node's system disks have been rebuilt as a single volume so that the system area and the added data disks share one redundancy policy.
 
05. Two UIS Standard Edition HCI clusters are being reorganized. One host is to be removed from a six-node cluster, and separately one host is to be removed from a three-node cluster. Both pools currently run with three replicas.
What distinguishes the second removal from the first?
a) The three-node cluster is left with two hosts, which is below the minimum for hyper-converged deployment, so the removal leaves an arrangement the platform does not support at all.
b) The three-node cluster is left with two hosts, which support two replicas and require an external monitor node, so the removal changes what the deployment supports rather than only how much it holds.
c) The three-node cluster rebuilds onto fewer remaining nodes, so the removal takes longer and loads the storage back-end network more heavily, while what the deployment supports is unchanged.
d) The three-node cluster holds each replica in a rack-level fault domain, so the removal reduces the number of domains and the pool falls back to host-level domains by itself.
 
06. An administrator is about to begin an upgrade of a UIS Standard Edition cluster.
Which two conditions belong to the check made before the procedure is started?
(Choose two.)
a) The storage front-end network has been moved onto the management network, so that a single plane carries both while the procedure runs.
b) The pool has been switched from thin to thick provisioning, so that no volume can grow while the procedure is running.
c) The change window allows for the management interface to be unreachable during part of the procedure, and the people who use it have been told.
d) The cluster is healthy, with no recovery or rebalancing still running from an earlier failure or from a recent expansion.
 
07. The upgrade procedure for a UIS Standard Edition cluster notes that logging in to the management interface may be unavailable for part of the run.
What does that mean for the cluster while the upgrade is in progress?
a) Management operations cannot be performed for that period, although losing the interface is not by itself evidence that hosts or their workloads have stopped.
b) Cluster membership is dropped for that period, because a host counts as unmanaged once the management service stops answering for it.
c) Storage access is interrupted for that period, because client reads and writes to the pool are carried through the management interface.
d) Virtual machines are suspended for that period, because the management component is what schedules them onto the virtualization kernel on each host.
 
08. After a node was returned to a cluster, the team wants to understand why replica re-creation for one storage pool took far longer than the same operation took last quarter.
Which log source should the investigation start from?
a) The alarm history in UIS Manager on its own, because it records every event the platform considered significant enough to report.
b) The CAS logs, because the compute-virtualization layer schedules the work that the storage layer then carries out.
c) The operating-system logs inside the virtual machines whose volumes are stored in the affected pool.
d) The ONEStor logs, because re-creating replicas is work the distributed storage layer performs.
 
09. Every storage node of a cluster sat in one rack. A power fault took that rack down, the pool went offline with it and the guests stopped. Power has since been restored and the nodes are coming back. The team held three replicas of every volume and is asking what the incident did to their data.
Which account of it is accurate?
a) All three copies went down with the rack and have to be brought back from a backup held outside the cluster before the pool can serve again.
b) The pool was short of copies for a failure at this level, so the lasting fix is to raise the replica count on its important volumes.
c) The copies were never destroyed — losing the rack took the nodes out of service, so what the layout cost was continuity rather than the data.
d) One copy stays authoritative through an outage of this kind, and the pool re-creates the other two from it as the nodes rejoin the cluster.
 
10. A node in a five-node UIS Standard Edition HCI cluster has failed with a mainboard fault. Replacement hardware of the same configuration is available and will be installed in the same position within the week.
How does this differ from permanently removing the node from the cluster?
a) The cluster treats the two cases identically until the hardware arrives, so both begin by taking the node out of the pool, redistributing the replicas it held.
b) The cluster requires maintenance mode for a replacement and not for a removal, so the difference lies in which precondition gates the work rather than in the end state.
c) The cluster reaches its original capacity sooner, so redundancy is restored automatically in both cases and the only real difference between them is the length of the degraded period.
d) The cluster is expected to return to its original node count, so its configuration is left as it stands, and a removal commits the cluster to fewer nodes.

Solutions:

Question: 01

Answer: c

Question: 02

Answer: b

Question: 03

Answer: a

Question: 04

Answer: b, c

Question: 05

Answer: b

Question: 06

Answer: c, d

Question: 07

Answer: a

Question: 08

Answer: d

Question: 09

Answer: c

Question: 10

Answer: d

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