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NEW QUESTION # 23
An administrator is preparing an array pair for ActiveDR and is trying to calculate the total minimum bandwidth requirement.
What percent of bandwidth above the incoming write rate should be allocated to accommodate for unexpected write bursts and still maintain near-sync RPO?
Answer: A
Explanation:
ActiveDR Bandwidth Sizing: ActiveDR is a continuous, asynchronous replication technology designed to provide near-zero RPO. Because it streams data continuously rather than in discrete snapshot intervals, the bandwidth between the source and target arrays must be able to handle the application's write workload.
Handling Write Bursts: Application workloads are rarely flat; they have peaks and valleys. If you size the bandwidth exactly to the average change rate, any burst in write activity will cause the replication lag to increase, thereby increasing your RPO.
The 30% Rule: Pure Storage best practices and sizing guides recommend providing a 30% buffer (headroom) above the measured average write rate. This extra capacity ensures that during a high-IO period, the replication engine has enough "pipe" to catch up quickly and return to a near-sync state.
Calculation Example: If a workload generates an average of 100 MB/s of new unique data, the administrator should ensure at least 130 MB/s of usable, dedicated bandwidth is available between the sites.
Consequences of Under-sizing: If only 10% (Option A) is used, the array may struggle to recover from even minor bursts, leading to a consistently climbing RPO. 50% (Option B) is often considered safe but can be cost-prohibitive or overkill for standard networking budgets unless the workload is exceptionally volatile.
NEW QUESTION # 24
What is the best practice for configuring VMFS UNMAP for ESXi 6.7 or later?
Answer: A
Explanation:
What is UNMAP?: UNMAP (SCSI command 0x42) is the mechanism that allows a host (like ESXi) to inform the storage array that specific blocks of data are no longer in use (e.g., after a VM is deleted or moved). This is critical for Pure Storage because it allows the array to reclaim that space and maintain high data reduction ratios.
Evolution in ESXi: In versions prior to 6.5, UNMAP was a manual process executed via the CLI. Starting with ESXi 6.7, VMware introduced Automatic Space Reclamation, which runs in the background.
The Pure Storage Recommendation: Pure Storage recommends setting the reclamation priority to Auto with Low Priority.
Low Priority: This ensures that the UNMAP commands are sent to the FlashArray at a steady, manageable rate (roughly up to 25 MB/s to 100 MB/s depending on the Purity version). Because FlashArrays are built on a high-performance metadata engine, "Low Priority" is more than sufficient to keep up with even high-churn environments without causing any contention for active application I/O.
Why avoid High Priority (Option B)?: Setting it to high priority or using a fixed high-burst rate can lead to "bursty" SCSI traffic. While the FlashArray can handle the load, it is considered a best practice to keep background maintenance tasks like space reclamation at a lower priority to ensure the "Big Three" (latency, bandwidth, IOPS) for production workloads remain optimized.
Verification: You can verify that UNMAP is working by looking at the Data Reduction metrics in the Purity GUI or Pure1. If the "Thin Provisioning" or "Reclaimed" numbers are increasing after file deletions, the host is correctly communicating its freed space to the array.
NEW QUESTION # 25
What FA File user authentication statement is correct?
Answer: C
Explanation:
Supported Directory Services: Pure Storage FlashArray File Services (FA File) is designed to integrate seamlessly into existing enterprise identity infrastructures. To manage file permissions (SMB ACLs and NFS POSIX/NFSv4 permissions), Purity supports joining the array to a directory service.
Active Directory (AD): This is the most common integration for FA File, specifically for SMB environments. Purity allows the array to join an AD Domain, creating a computer account and enabling the resolution of SIDs to usernames.
OpenLDAP: For Linux/Unix-heavy environments using NFS, Purity supports OpenLDAP. This allows the array to look up UID/GID information and group memberships to enforce security across the file system.
Authentication vs. Management: It is important to distinguish between Data Access (FA File) and Management Access (GUI/CLI login).
FA File (Data Access): Uses AD and OpenLDAP to authorize users accessing shares/exports.
Management (GUI/CLI): Uses SAML (Option C) or LDAP for Single Sign-On (SSO) (Option B) to allow administrators to log into the array.
The "Either/Or" Logic: While a FlashArray can be configured with multiple directory services, for a specific File System/Export mapping, the system relies on the primary identity provider configured-either Microsoft AD or an LDAP-compliant service like OpenLDAP-to validate the users' identity.
NEW QUESTION # 26
Which command provides the negotiated port speed of an ethernet port?
Answer: B
Explanation:
On a Pure Storage FlashArray, Ethernet ports operate at both a physical hardware layer and a logical network configuration layer. If you need to verify the actual physical negotiated port speed of an Ethernet port (for example, verifying if a 25GbE port negotiated down to 10GbE due to switch configurations or cable limitations), you must query the hardware layer directly.
The command purehw list --all --type eth interacts directly with the physical NIC hardware components to report their true link status, health, and dynamically negotiated hardware link speed.
Here is why the other options are incorrect:
purenetwork eth list -- all (B): The purenetwork command suite is primarily focused on the logical Layer 2/Layer 3 networking stack. It is used to configure and list IP addresses, subnet masks, MTU sizes (Jumbo Frames), and routing, rather than focusing on the physical hardware negotiation details of the NIC itself.
pureport list (A): The pureport command suite is specifically used for managing and viewing storage protocol target ports. An administrator would use this to list the array's Fibre Channel WWNs or iSCSI IQNs to configure host zoning or initiator connections, not to verify Ethernet link negotiation speeds.
NEW QUESTION # 27
An engineer is tasked by the IT security team to pull audit trail logs from the last month. The engineer navigates to the audit trail section of the FlashArray GUI, but sees the audit trail only contains a maximum of 1000 records.
What step should the engineer take?
Answer: A
Explanation:
Local Array Limitations: The FlashArray GUI and CLI maintain a local buffer for audit logs (which track commands, logins, and configuration changes). However, this local storage is limited in size and record count (typically around 1000 records or a short timeframe) to ensure that logging does not consume excessive system resources on the controllers. Once the limit is reached, older records are overwritten (FIFO - First In, First Out).
Pure1 as the Historical Repository: Pure1 is Pure Storage's cloud-based management and monitoring platform. One of its primary functions is to act as a long-term repository for array data. FlashArrays "phone home" their audit logs to Pure1, where they are indexed and stored for much longer periods (typically up to one year or more, depending on the subscription level).
Auditing in Pure1: By logging into the Pure1 portal, an administrator can navigate to the Audits section. Unlike the local GUI, Pure1 allows users to filter by specific date ranges, specific arrays, and specific users across the entire fleet. This makes it the standard tool for security audits and compliance reporting.
Why Option A and C are incorrect: * Option A: While the CLI is powerful, it still pulls from the same limited local buffer as the GUI. If the record has been overwritten locally, the CLI cannot retrieve it.
Option C: Purity does not typically allow customers to modify "tunables" to increase log storage, as this could impact the stability or performance of the Purity Operating Environment.
NEW QUESTION # 28
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