Dell PowerVault MD3000i Hardware Owner's Manual - Page 35
RAID Operations and Features, Virtual Disk Operations - restart
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Other conditions under which sectors are added to the unreadable sector log include: • A media error is encountered when trying to access a physical disk that is a member of a nonredundant disk group (RAID 0 or degraded RAID 1, RAID 5 or RAID 10). • An error is encountered on source disks during rebuild. NOTE: Data on an unreadable sector is no longer accessible. RAID Operations and Features This section details the following RAID operations and features supported by your enclosure or RAID controller: • Virtual disk operations • Disk group operations • RAID background operations priority • Virtual disk migration and roaming Virtual Disk Operations Virtual Disk Initialization Every virtual disk must be initialized. Up to four concurrent initializations can occur for the same RAID controller module. Background Initialization The RAID controller module executes a background initialization when the virtual disk is created to establish parity, while allowing full host server access to the virtual disks. Background initialization does not run on RAID 0 virtual disks. The background initialization rate is controlled by MD Storage Manager. You must stop an ongoing background initialization before you change the rate, or the rate change will not take effect. After you stop background initialization and change the rate, the rate change will take effect when the background initialization restarts automatically. NOTE: Unlike initialization of virtual disks, background initialization does not clear data from the physical disks. Using Your RAID Enclosure 35