Adaptec xw4100 Software User's Manual

Also see for 2120S - SCSI RAID Controller: User guide Installation guide Installation guide Installation and user guide Installation guide

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Adaptec xw4100 Software User's Manual Manual pdf 74 page image

4-8Adaptec SCSI RAID 2120S/2200S Software User’s GuideEnabling SparesA spare disk (also called a “hot spare”) is a disk that you configureto recover data from a failed segment/disk in a redundant array.To assign one or more spare disks for a single array, use thecontainer set failover command. To assign one or morespare disks for all arrays, use the container setglobal_failover command. The main characteristic of thesecommands is that you must “manually” assign the spare disk toone or more arrays. In fact, you might consider the previouslydescribed spare mechanism as “manually set spare.”Note: RAID 1, 5 10 and 50 use the spare assignment if a diskfails. (RAID 1, 5, 10 and 50 are often referred to as redundantarrays).Automatic rebuild on replacement allows you to replace a faileddisk with a replacement disk. The controller automatically assignsthe disk you insert as a hotspare without your having to first assignit manually using the container set failover orcontainer set global_failover command.See the Adaptec SCSI RAID Software Reference Guide for moreinformation on the container set failover and containerset global_failover commands.Caution: The controller deletes any data on the replacementdisk when automatic rebuild on replacement is enabled andyou remove the failed disk and insert the replacement disk inthe failed disk’s slot.Note: The automatic spare feature works only with disks thatreside in an SAF-TE or SES enabled enclosure.Through the CLI, you can:■ Display a controller’s automatic rebuild on replacement status■ Enable automatic rebuild on replacement!