HP0-J64 Online Practice Questions and Answers

Correct Answer: A

Best practices Use a single IP subnet with Layer 2 switching

Configure redundant network paths between sites to help minimize link failure in a two-site

configuration. In multi-site cluster with three sites, HP recommends a triangle network design, not a V- design to ensure high availability.

For 1GbE installations allocate 50 MB/s per storage node in the sites between data centers; for

environments with 10GbE storage connectivity, reserve 250 MB/s. For campus cluster deployments with Fibre Channel connectivity on HP StoreVirtual, plan for 500 MB/s per storage node in the sites (only two sites supported). In the example (see Figure 7) above with 1GbE storage connectivity and two storage nodes in each

site, designate 50 MB/s x 2 = 100 MB/s of bandwidth between the sites (at least one 1GbE link; two for redundancy). HP StoreVirtual Fail-over Manager is not in the data path and has to be connected using at least Fast

Ethernet (100 Mb/s) with a latency not exceeding 50 ms.

Network latency High network latency can be the primary cause of slow I/O performance, or worse, iSCSI target disconnects. It is important to keep round trip network latency on your storage subnet below two milliseconds. Many factors can contribute to increasing network latency, but two are most common:

Distance between storage cluster nodes

Router hops between storage cluster nodes

Configuring a multi-site cluster on a single IP subnet with Layer 2 switching will help to lower the network latency between storage cluster nodes.

Correct Answer: C

http://h20195.www2.hp.com/V2/GetPDF.aspx%2F4AA3-8318ENW.pdf Replication solutions for demanding disaster tolerant environments HP 3PAR Remote Copy software

Long-distance disaster recovery

Disaster recovery requirements that include low RTOs and zero-data loss RPOs pose a significant challenge.

Adding a requirement for a distant disaster recovery site on the opposite side of a continent rather than in an adjacent town greatly compounds these challenges and the complexity of typical solutions.

PDF Replication solutions for demanding disaster tolerant environments, pp 10 e 11 Synchronous long- distance topology

Synchronous long distance combines the ability to make replicas created using synchronous mode over a high-speed low-latency network along with the high-link latency replication capability offered by asynchronous periodic mode to provide

a long distance replication solution. An SLD topology has the potential of delivering a zero data loss RPO to the remote asynchronous periodic replication site. This is accomplished by using two backup storage servers: one located near the

primary InServ using Synchronous mode (the sync array) and a distant storage server using asynchronous periodic mode (the disaster recovery array). In addition to the HP 3PAR Remote Copy connections from the primary array to the two

backup arrays, a passive asynchronous periodic link is configured from the sync array to the disaster recovery array (see figure 8). This is the only HP 3PAR Remote Copy technology that supports replicating the same Remote Copy primary

volumes from a source array to two separate target arrays. Only a single Remote Copy volume group (consistency group) is supported in an synchronous long distance topology.

The primary intent of the SLD topology is to provide users with a way of potentially achieving an RPO of zero at the distant asynchronous periodic disaster recovery array in the event a disaster renders the primary array down. If a disaster

takes the primary storage array down, on failover to the sync array, the passive asynchronous periodic link between the sync array and the disaster recovery array is activated and any data that was written on the sync array but that has not

yet made it to the disaster recovery array is sent from the sync array to the disaster recovery array, bringing the disaster recovery array up to date with the last write that occurred to the primary array. After the disaster recovery array has been

made consistent with the state of the primary storage array at the time of failure, operations may be continued using the disaster recovery site with no loss of data suffered (RPO = 0) (or operations can proceed from the sync array if that is

desired). The normally passive asynchronous periodic link between the sync array and the disaster recovery array is then reversed so updates to the disaster recovery array are replicated back to the sync array albeit in asynchronous periodic

mode. When the original primary array is restored to service, its Remote Copy links are reversed and used to synchronize the primary server's volumes with changes that occurred during the outage before resuming normal service.

Correct Answer: B

SmartClone technology is based on the space-efficient LeftHand Thin Provisioning architecture, and the volume clones can be used without limitation along with all other LeftHand OS features like Network RAID, Thin Provisioning, Snapshot, and Remote Copy. The feature works by taking any volume or snapshot and making one or many clones in an instant. The cloning function makes a permanent, read/write volume on the array, pointing back to the original volume's blocks instead of duplicating the blocks. By managing each clone as a pervasive volume, SmartClone eliminates any requirement for a volume, snapshot, or any of its predecessors to exist after the clone has been created, and also eliminates the need to run de- duplication software, because there are no duplicate blocks. The clone shares the original volume's blocks and uses copyon-write semantics. SmartClone technology reduces storage costs and increases overall storage efficiency.

Administrators can store "gold-master" system images on the array for virtual desktop and boot- from-SAN implementations, and quickly provision test environments using real production data. To simplify management, administrators can view all of the relationships between clones, volumes, and snapshots graphically in the Control Management Console. http://h18006.www1.hp.com/products/ quickspecs/13254_div/13254_div.pdf

Correct Answer: B

Web Based Enterprise Services

WEBES is a tool suite aimed at preventing or reducing your system's down time. The tool suite has the following components:

SEA (for operating system binary event log analysis). If you have a warranty or service contract with HP you are entitled to these tools free of charge. You must, however, upgrade the tools at least once a year, because the software expires

after one year

http://www8.hp.com/us/en/support/svctools/webes.html

Correct Answer: D

Mesh-Active Controller Design All HP 3PAR Storage Systems feature a unique Mesh-Active design as part of a next-generation architecture designed for virtual and cloud data centers. Unlike legacy "active-active" controller architectures -- where each volume is active on only a single controller -- this Mesh-Active design allows each volume to be active on every controller in the system. The result is robust, load-balanced performance and greater headroom for costeffective scalability that is designed to overcome the tradeoffs associated with modular and monolithic storage systems. A high-speed, full-mesh, passive system backplane joins multiple Controller Nodes to form a cachecoherent, active-active cluster that represents the next generation of Tier 1 Storage. http://h20195.www2.hp.com/v2/GetPDF.aspx/4AA2-9918ENW.pdf

Correct Answer: B

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CMC Centralized Management Console. See HP StorageWorks P4000 Centralized Management Console.

Correct Answer: A

Correct Answer: B

Reference: http://h20195.www2.hp.com/V2/GetPDF.aspx%2F4AA4-6542ENW.pdf (page 1, key management is essential)

Correct Answer: D

Correct Answer: B

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