![]() ![]() You can set up storage pools that have different performance or recoverability characteristics and assign folders to them using affinities. So, you can improve access speed by distributing available storage over several LUNs in a storage pool. Xsan distributes file data in parallel across the LUNs in a storage pool using a RAID 0 (striping) scheme. A storage pool in a small volume might consist of a single RAID array, but storage pools in many volumes consist of multiple arrays. After your Xserve RAID LUNs are set up, you label and initialize them for use with the Xsan file system using Xsan Admin. Xsan sees the arrays as LUNs that can be combined to create a volume. Half of the arrays use a RAID 0 scheme (striping only) for speed while the others use RAID 5 (distributed parity) to ensure against data loss. The illustration on page 12 shows four Xserve RAID systems hosting two arrays each. ![]() For help choosing schemes for your LUNs, see "Choosing RAID Schemes for LUNs" on page 23. If the two RAID 5 arrays on a new Xserve RAID are not right for your application, you can use RAID Admin to create arrays based on other RAID schemes. One of your first tasks when you set up a SAN volume is to prepare LUNs. If you slice an array, each slice appears as a LUN. Each array appears on the network as a separate LUN. The controller hardware and software in the Xserve RAID system combine individual drive modules into an array based on the RAID scheme you choose. ![]()
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