FeaturesnThe ServeRAID M5210 and M5210e SAS/SATA controllers have the following standard features:nn- Auto-resume on array rebuild or array reconstruction after the loss of system powernnAuto-resume uses non-volatile RAM (NVRAM) to save the rebuild progress during a host reboot ornpower failure to automatically resume from the last checkpoint. Auto-resume ensures that datanintegrity is maintained throughout the process. The card supports a number of features that can benimplemented without rebooting the server. Applications, such as email and web server, benefit fromnavoiding downtime during the transition.nn- Online Capacity ExpansionnnOnline Capacity Expansion (OCE) allows the capacity of a virtual disk to be expanded by adding newnphysical disks or making use of unused space on existing disks, without requiring a reboot.nn- Online RAID Level MigrationnnOnline RAID Level Migration, which is also known as logical drive migration, can migrate a virtualndisk from any RAID level to any other RAID level without requiring a reboot. System availability andnapplication functionality remain unaffected.nn- Fast initialization for quick array setupnnFast initialization quickly writes zeros to the first and last sectors of the virtual drive. This featurenallows you to immediately start writing data to the virtual drive while the initialization is running in the background.nn- Consistency check for background data integritynnConsistency check verifies that all stripes in a virtual disk with a redundant RAID level are consistent. The consistency check mirrors data when an inconsistent stripe is detected for RAID 1 and re-creates the parity from the peer disks for RAID 5 or RAID 6. Consistency checks can be scheduled to take place periodically.nnExtensive online configuration options and advanced monitoring and event notificationnnManagement tools provide convenience for the configuration of logical volumes and alerting whennerrors have occurred or are about to occur.nnPatrol read for media scanning and repairingnnPatrol read is a background sentry service that pro-actively discovers and corrects media defectsn(bad sectors) that arise normally as a disk drive ages. The service issues a series of verifyncommands, and if a bad block is discovered, the card's firmware uses RAID algorithms to re-createnthe missing data and remap the sector to a good sector. The task is interruptible based on controller activity and host operations. The firmware also provides an interface where the patrol read task can be initiated, set up for continuous operation, and terminated from a management application. Patrol read can be activated by a manual command or automatically.nn- Global and dedicated hot spare with revertible hot spare supportnnA hot spare rebuilds data from all virtual disks within the disk group in which it is configured.nServeRAID can define a physical disk as a hot spare to replace a failed drive. Hot spares can benconfigured as either global or dedicated. A global hot spare allows any physical drive to bendesignated as a hot spare. A dedicated hot spare allows the user to assign a hot spare drive to anparticular array of the same drive type.nnDrive roamingnnDrive roaming occurs when the physical disks are changed to different ports on the same controller.nWhen the drives are placed on different channels, the controller detects the RAID configuration fromnthe configuration data on the drives.