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질문 # 55
What does an asynchronous blackout window prevent?
정답:A
설명:
Definition of a Blackout Window: In Purity//FA, a Blackout Window is a scheduled period during which asynchronous replication is suspended. This is typically used by administrators to preserve WAN bandwidth during peak business hours or to prevent replication traffic from competing with high-priority local workloads (like a massive database batch job).
The "In-Progress" Rule: One of the most important characteristics of a blackout window is that it is non-disruptive to active transfers. If a replication job started at 7:55 AM and the blackout window begins at 8:00 AM, Purity will allow that specific transfer to continue until it finishes.
The Prevention Mechanism: Once the clock hits the start of the blackout window, the replication scheduler is effectively "paused." No new snapshots will be queued for transfer, and no new replication sessions will be initiated until the window expires.
Why Option A is incorrect: Purity does not kill active transfers. Abruptly stopping a transfer would waste the bandwidth already consumed and require the entire delta-set to be re-calculated or re-sent later.
Why Option B is incorrect: The phrasing is logically inconsistent; you cannot prevent something that "started before" the window from being "new" during the window.
Best Practice: When configuring blackout windows, ensure that the "clear" time (the time between windows) is long enough to allow the array to catch up on the snapshots that were queued during the blackout, otherwise, you risk triggering Alert 51 (Replication Delayed).
질문 # 56
What is the Pure Storage recommended Maximum Transmission Unit (MTU) size for the replication ports on a FlashArray?
정답:A
설명:
Understanding MTU: The Maximum Transmission Unit (MTU) defines the largest size of a packet or frame that can be sent in a single network transaction. The standard Ethernet MTU is 1500 bytes. Anything larger than 1500 bytes is referred to as a Jumbo Frame.
Replication Efficiency: Replication involves moving large amounts of data between arrays. Using standard 1500-byte frames results in higher overhead because the CPU must process a larger number of headers for the same amount of data. By increasing the MTU, the FlashArray can pack more data into each frame, reducing CPU interrupts and improving overall throughput.
The Pure Recommendation: Pure Storage specifically recommends an MTU of 9000 for both iSCSI and Replication traffic. This is the industry standard for Jumbo Frames that balances efficiency with compatibility across most enterprise-grade switches.
Configuration Requirements: It is critical to remember that MTU must be configured end-to-end. For an MTU of 9000 to work on the replication ports:
The FlashArray replication ports must be set to 9000.
The network switches along the path (and any routers/ISLs) must support and be configured for at least 9000.
The target array's replication ports must also be set to 9000.
Why 9216 (Option A) is incorrect: While some switches support a "Baby Giant" or slightly larger MTU like 9216 to account for VLAN tagging overhead, Pure's internal and best practice documentation specifically points to 9000 as the standard setting for the array's interface.
질문 # 57
Which FA File Directory Services statement is correct?
정답:C
설명:
Interface Separation: Pure Storage FlashArrays distinguish between Management traffic (used for the GUI, CLI, and Pure1 connectivity) and Data traffic (used for host connectivity). Within the data path, File Service Interfaces are the logical interfaces assigned to handle NFS and SMB traffic.
Directory Service Communication: For FA File to function, it must communicate with external identity providers (like Microsoft Active Directory or OpenLDAP) to authenticate users and resolve permissions.
The Default Path: By design, Purity prioritizes the File Service Interfaces for these lookups. This is because the directory servers (Domain Controllers) are typically located on the same production/data network as the clients accessing the files. Using the File Service Interface ensures that authentication traffic follows the same network path and security rules as the data traffic itself.
Why Option B is incorrect: While the array management plane can use the management interfaces for its own administrative LDAP/SAML logins, the File Services component defaults to the data-path (File) interfaces to avoid "crossing the streams" between management and production data networks.
Why Option C is incorrect: Purity is very specific about its routing tables. It does not blindly use "all" interfaces for DNS/Directory services. If a File Service interface is configured and active, it becomes the primary egress point for file-related metadata and authentication requests.
질문 # 58
An On-Premises ActiveCluster (AC) Mediator is installed on an ESXi server. The mediator was previously online but when the administrator checked the status of the ActiveCluster (AC) pods the mediator status was listed as "unreachable" for both FlashArrays in the ActiveCluster (AC) pair.
What is a possible cause of the mediator being unreachable from both FlashArrays?
정답:A
설명:
The ActiveCluster Mediator (whether it is the Pure1 Cloud Mediator or the On-Premises VM) is a lightweight tie-breaker that communicates continuously with the management interfaces of both FlashArrays. If it was previously online and suddenly reports as "unreachable" from both arrays simultaneously, the issue is almost always caused by a network interruption or firewall rule change blocking the required communication ports between the arrays' management IP addresses and the Mediator VM.
If a network firewall is suddenly configured to drop or deny outbound TCP traffic (such as port 80/443 depending on the specific HTTP/HTTPS discovery and heartbeat configuration) from the FlashArrays to the ESXi-hosted Mediator, the arrays will fail to send their heartbeats, causing the mediator status to drop to "unreachable." Here is why the other options are incorrect:
Fibre Channel (FC) zoning or network access has not been created properly for the host (A): The Mediator is completely independent of the front-end host storage fabric (Fibre Channel or iSCSI). Host zoning issues would prevent the ESXi server from seeing its volumes, but it would not cause the FlashArrays to lose management network connectivity to the Mediator.
The mediator does not reside within a Pure datastore (B): This is actually a strict best practice and requirement. Pure Storage explicitly states that the On-Premises Mediator VM must be deployed in a separate (third) failure domain. It should not reside on the ActiveCluster mirrored datastore, because a site-wide SAN failure would take the mediator offline exactly when it is needed most. Therefore, not residing on a Pure datastore is the correct setup, not a cause for an outage.
질문 # 59
What is the proper configuration method to connect a volume to multiple hosts?
정답:A
설명:
In Pure Storage Purity OS, the absolute best practice and proper configuration method for sharing a single volume across multiple hosts-such as a VMware ESXi cluster or a Microsoft Windows Server Failover Cluster (WSFC)-is to connect the volume to a Host Group.
When you create a Host Group, you add the individual Host objects (which contain the WWPNs, IQNs, or NQNs) into that group. When a volume is then connected to the Host Group, Purity automatically ensures that the volume is presented to every host in that group using the exact same LUN ID. Consistent LUN IDs across all nodes in a cluster are a strict requirement for clustered file systems like VMFS and Cluster Shared Volumes (CSV) to function correctly and prevent data corruption.
Here is why the other options are incorrect:
Connect the volume to each individual host (C): This is known as creating "private connections." If you manually connect a shared volume to multiple hosts individually, Purity might assign a different LUN ID to the volume for each host. Inconsistent LUN IDs will cause clustered operating systems to fail to recognize the disk as a shared resource. Private connections should only be used for boot LUNs or standalone standalone servers.
Connect a volume group to the host (B): In Purity, a "Volume Group" is a logical container used for applying consistent snapshot policies, replication schedules, or ActiveCluster configurations to a set of related volumes (like a database and its log files). Volume groups are not used for host presentation or access control.
질문 # 60
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