Background Information for Creating RAID 0 Volumes Solaris Volume

Background information for creating raid 0 volumes

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Background Information for Creating RAID-0 Volumes Solaris Volume ManagerAdministration Guide • May 2006 80
Scenario—RAID-0 Volumes RAID-0 volumes provide the fundamental building blocks for creating more complex storage configurations or for building mirrors. The following example, drawing on the scenario explained in Chapter 5 , describes how RAID-0 volumes can provide larger storage spaces and allow you to construct a mirror of existing file systems, including root ( / ). The sample system in the scenario has a collection of relatively small (9 Gbyte) disks, but specific applications would likely require larger storage spaces. To create larger spaces (and improve performance), you can create a stripe that spans multiple disks. For example, each one of the following disks, c1t1d0 , c1t2d0 , c1t3d0 , c2t1d0 , c2t2d0 , and c2t3d0 , could be formatted with a slice 0 that spans the entire disk. Then, a stripe including all three of the disks from one controller could provide approximately 27 Gbytes of storage and allow faster access. The second stripe, from the second controller, could be used for redundancy, as described in Chapter 11 and specifically in the “Scenario—RAID-1 Volumes (Mirrors)” on page 103 . Scenario—RAID-0 Volumes Chapter 8 • RAID-0 (Stripe and Concatenation) Volumes (Overview) 81
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RAID-0 (Stripe and Concatenation) Volumes (Tasks) This chapter contains information about tasks that are related to RAID-0 volumes. For information about related concepts, see Chapter 8 . RAID-0 Volumes (Task Map) The following task map identifies the procedures that are needed to manage Solaris Volume Manager RAID-0 volumes. Task Description For Instructions Create RAID-0 (stripe) volumes Use the Solaris Volume Manager GUI or the metainit command to create a new volume. “How to Create a RAID-0 (Stripe) Volume” on page 84 Create RAID-0 (concatenation) volumes Use the Solaris Volume Manager GUI or the metainit command to create a new volume. “How to Create a RAID-0 (Concatenation) Volume” on page 85 Expand storage space Use the Solaris Volume Manager GUI or the metainit command to expand an existing file system. “How to Expand Storage Capacity for Existing Data” on page 87 Expand an existing RAID-0 volume Use the Solaris Volume Manager GUI or the metattach command to expand an existing volume. “How to Expand an Existing RAID-0 Volume” on page 88 Remove a RAID-0 volume Use the Solaris Volume Manager GUI or the metaclear command to delete a volume. “How to Remove a RAID-0 Volume” on page 90 9 C H A P T E R 9 83
Creating RAID-0 (Stripe) Volumes Caution – Do not create a stripe from an existing file system or data. Doing so destroys data. To create a stripe from existing data, you must back up the data, create the stripe volume, and then restore the data to the volume.

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