D-Link DNS-1250-04 User Manual for DNS-1250-04 - Page 62
PDM, A physical drive with unhealthy status see below.
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determine whether: The physical drives in your array can support the target RAID level. There is sufficient capacity to accommodate the target logical drive size. If you need to add physical drives to your array, be sure there are unassigned physical drives are installed in your RAID system before you begin migration. Supported RAID levels Target Source RAID 0 RAID 1 RAID 1E RAID 5 RAID 6 RAID 10 RAID 50 RAID 0 ● ● ● ● ● ● ● RAID 1 ● ● ● ● ● RAID 1E ● ● ● ● ● RAID 5 ● ● ● ● ● ● RAID6 ● RAID 10 ● ● ● ● ● ● RAID 50 ● ● ● ● ● ● PDM Predictive Data Migration (PDM) is the migration of data from the suspect physical drive to a spare physical drive, similar to rebuilding a logical drive. But unlike Rebuilding, PDM constantly monitors your physical drives and automatically copies your data to a spare physical drive BEFORE the physical drive fails and your logical drive goes Critical. The following actions trigger PDM: A physical drive with unhealthy status (see below). Media Patrol finds a disk critical error. You initiate PDM manually. PDM also counts the number of media errors reported by Media Patrol. A physical drive becomes unhealthy when: 54