2 striping at a higher level, 6 setting up an exasan-enabled xsan, 3 check luns from the system profiler – Accusys ExaSAN SW-08 User Manual
Page 56: Striping at a higher level -5, Setting up an exasan-enabled xsan -5, Check luns from the system profiler -5
6. Xsan
User Guide
Page 6-5
6.5.2 Striping at a Higher Level
When a RAID system writes a file using a RAID 0 (striping) scheme, it breaks the file into segments and
spreads them across disk drives in the RAID array. This improves performance by writing parts of the file
in parallel (instead of one part at a time) to disks in the array.
Xsan applies this same technique in the storage hierarchy. Within each storage pool in a volume, Xsan
stripes file data across the individual LUNs that make up the storage pool. Performance is improved
because data is written in parallel.
6.6 Setting Up an ExaSAN-enabled Xsan
This section explains how to connect the ExaSAN networks, check the accessible LUNs, install and use
the Xsan Admin application, and create Xsan volume.
The descriptions of Xsan settings in this document are within the context of ExaSAN only. For the
Generic Xsan settings, please refer to Apple’s Xsan 2 Administrator Guide.
6.6.1 Connecting Computers and Storage to ExaSAN Switch
Before you open Xsan Admin to configure your SAN, you must connect client computers, controller
computers, and ExaSAN storage devices to the ExaSAN switch and Ethernet networks. Refer to Section
3.1, “Installing the System,” for additional information.
6.6.2 Connecting Xsan Metadata Private Ethernet Network
In addition to the ExaSAN network and Ethernet public network, all client computers on the Xsan must
be connected to a private Ethernet network. Xsan metadata controllers and clients use this network instead
of the ExaSAN PCIe network to exchange file system metadata. The client and metadata controller
computers need static (fixed) IP addresses for both the public and Xsan private Ethernet network
connections. Do not use DHCP to assign dynamic IP addresses to Xsan devices.
It is recommended to use the following ranges of IP addresses for Xsan private metadata network:
• IP address range: 10.0.0.0 to 10.0.0.255
• Subnet mask: 255.255.255.0
6.6.3 Check LUNs from the System Profiler
Restart Xsan metadata controllers and all clients. Launch the “System Profiler” and select “Parallel SCSI”
in the left pane, verify that the ExaSAN LUNs are present as shown in the example below.