HP StoreVirtual 4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 315
A Replacing disks reference, Replacing disks and rebuilding data, Before you begin, Prerequisites
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A Replacing disks reference NOTE: RAID refers to the disk level RAID set on an individual storage system. Network RAID refers to the data protection level set on volumes when they are created. The data protection level is always referred to as Network RAID. Disk RAID is always referred to as RAID. This chapter describes the disk replacement procedures for cases in which you do not know which disk to replace and/or you must rebuild RAID on the entire storage system. For example, if RAID has gone off unexpectedly, you need Customer Support to help determine the cause, and if it is a disk failure, to identify which disk must be replaced. Replacing disks and rebuilding data Single disk replacements in storage systems where RAID is running, but may be degraded, can be accomplished by following the procedures described in "Replacing disks" on page 316. The following situations may require consulting with Customer Support to identify bad disks, and then following the procedures in this chapter to rebuild the data (when configured for data protection) on the storage system: • RAID 0 (Stripe) - RAID is off due to a failed disk. • RAID 5, 5+spare (Stripe with parity), and 50 - If multiple disks need to be replaced, they must be identified and replaced, and the data on the entire storage system rebuilt. • RAID 10/1+0 (Mirror and Stripe) - Can sustain multiple disk replacements. However, Customer Support must identify if any two disks are from the same mirror set, and then the data on the entire storage system needs to be rebuilt. • RAID 6 (Stripe with dual parity) - If multiple disks need to be replaced, they must be identified and replaced, and the data on the entire storage system rebuilt. Before you begin 1. Know the name and physical location of the storage system that needs the disk replacement. 2. Know the physical position of the disk in the storage system. 3. Have the replacement disk ready, and confirm that it is the right size and has the right carrier. For confirmation on which disks need to be replaced, contact customer support. Prerequisites • All Network RAID-10, Network RAID-10+1, Network RAID-10+2, Network RAID-5, and Network RAID-6 volumes and snapshots should show a status of Normal. Network RAID-0 volumes may be offline. P4000 SAN Solution user guide 315