| 摘要 |
<p>When a disc fails in a redundant array of independent discs (RAID), the storage controller allocates a virtual storage area, on which to reconstruct the data from the failed disc. The storage area is selected such that its write performance is similar to the read performance of the array. When the data has been rebuilt it is migrated back to the array. The read performance may include the read speed or the amount of data read in each operation. The write performance may be the total size of the data to be recovered or the speed of writing. The virtual storage area may be constructed from spare space in the array. The array may have high performance and low performance tiers of devices. In this case, the virtual storage area might be allocated from a high performance tier. This may include a solid state device (SSD).</p> |
