HP 6100 HP 4x00/6x00/8x00 Enterprise Virtual Array User Guide (5697-0733, Marc - Page 65
Enterprise Virtual Array operation, Best practices, Operating tips and information
View all HP 6100 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 65 highlights
4 Enterprise Virtual Array operation This chapter presents the tasks that you might need to perform during normal operation of the storage system. Best practices For useful information on managing and configuring your storage system, see the HP Enterprise Virtual Array configuration best practices white paper available from http://h18006.www1.hp.com/storage/arraywhitepapers.html Operating tips and information Reserving adequate free space To ensure efficient storage system operation, a certain amount of unallocated capacity, or free space, should be reserved in each disk group. The recommended amount of free space is influenced by your system configuration. For guidance on how much free space to reserve, see the HP Enterprise Virtual Array configuration best practices white paper. See "Best practices" (page 65). Using FATA disk drives FATA drives are designed for lower duty cycle applications such as near online data replication for backup. These drives should not be used as a replacement for EVA's high performance, standard duty cycle, Fibre Channel drives. Doing so could shorten the life of the drive. Changing the host port topology Before changing the topology settings of an array host port, physically disconnect the host port from its existing connection, change the topology setting, and then reconnect the host port. For example, to change from a fabric (switched) topology to a direct connect topology, do the following: 1. Disconnect the host port(s) from the Fibre Channel switch. 2. Using the operator control panel (OCP), change the controller host port mode from fabric to direct connect. 3. Connect the host HBA(s) directly to the array host port(s). Host port connection limit on B-series 3200 and 3800 switches The B-series 3200 and 3800 switches are limited to a maximum of three EVA4x00/6x00/8x00 host ports on a single B-series 3200 and 3800 switch running version 3.2.x. HP recommends not exceeding more than one storage host port connection on a single switch. If you are required to connect more than one storage host port to a single affected switch, separate the connection into different quadrants. Connections are typically dropped following an array controller resynchronization or when an event impacts the fabric, such as rebooting or adding a switch. Use the following options to avoid or manage the port limitation: • For all hosts, zone by HBA as defined in the HP SAN Design Reference Guide. • Limit affected switches to only one HBA connection per host. • Limit placement of the switch as an edge device and not part of the core. If the switch drops a connection, reestablish as follows: Best practices 65