Dell PowerVault MD3260 Administrator's Guide - Page 156
Self-Monitoring Analysis And Reporting Technology (SMART), Media Errors And Unreadable Sectors
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7. Monitor the progress and completion status of the download to the expansion enclosures. The progress and status of each expansion enclosure that is participating in the download is displayed in the Status column of the Select enclosures table. NOTE: Each firmware download can take several minutes to complete. 8. Perform one of these actions depending on whether the download succeeded: - The download succeeded - The statuses of all the expansion enclosures show Complete. You can close the Download environmental (EMM) Card Firmware dialog by clicking Close. The expansion enclosure EMM cards are now operating with the new firmware. - The download failed - The status of one expansion enclosure shows Failed, and the remainder of the expansion enclosures show Canceled. Make sure that the new firmware file is compatible before attempting another firmware download. Self-Monitoring Analysis And Reporting Technology (SMART) Self-Monitoring Analysis and Reporting Technology (SMART) monitors the internal performance of all physical disk components to detect faults indicating the potential for physical disk failure. SMART uses this information to report whether failure is imminent so that a physical disk can be replaced before failure occurs. The RAID controller monitors all attached drives and notifies users when a predicted failure is reported by a physical disk. Media Errors And Unreadable Sectors If the RAID controller detects a media error while accessing data from a physical disk that is a member of a disk group with a redundant RAID level (RAID 1, RAID 5 or RAID 10), the controller tries to recover the data from peer disks in the disk group and uses recovered data to correct the error. If the controller encounters an error while accessing a peer disk, it is unable to recover the data and affected sectors are added to the unreadable sector log maintained by the controller. 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. 156