NEC Storage S1300 User Manual

Also see for VERSA S1300 Series: User guide Quick reference guide User guide

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NEC Storage S1300 User Manual Manual pdf 36 page image

Dummy Logical DiskIf there are no logical disks, the OS is unable to recognize a disk array unit. To avoidthis problem, logical disk 0 of RAID0 (with a single disk drive) is automatically createdwhen the disk array unit is powered on with all logical disks unbound.Do not use the created logical disk as it is. After the OS recognizes the logical disk, besure to unbind it by using the management software (NEC Storage Manager), and thenbind it.If the cross call feature is set to OFF, the controller on slave side is unable to recognizea dummy logical disk. To unbind a dummy logical disk from the controller on slaveside, use the controller that can recognize a dummy logical disk to set the cross callfeature to ON temporarily, then assign a logical disk.Hot Spare FeatureSpare disks can be installed in the disk array unit. If a disk drive in the same FC loop asthe spare disk fails, the data in the defective disk drive can be regenerated to the sparedisk. After the data recovery, the disk array unit operates normally if another disk driveis defected. Since the unit also supports the hot-swapping function, the failed disk canbe replaced while the power is on (except for RAID level 0).To use the hot spare feature, an optional disk drive must be installed.The figure below shows an example of hot spare operation.DRV14 Spare disk DRV14 DRV14 Spare diskDRV13 DRV13 DRV13DRV12 DRV12 DRV12DRV11 DRV11 DRV11DRV10 DRV10 DRV10DRV9 DRV9 DRV9DRV8 → DRV8 → DRV8DRV7 DRV7 DRV7DRV6 DRV6 DRV6DRV5 DRV5 DRV5DRV4 DRV4 DRV4DRV3 DRV3 DRV3DRV2 LDN0 RAID5 DRV2 LDN0 RAID5 DRV2 LDN0 RAID5DRV1 DRV1 DRV1DRV0 DRV0 DRV0Failure in DRV1 Recovery of datain spare diskReplacement of DRV 1Data are restored from sparedisk to DRV 1* DRV: Disk driveLDN: Logical Disk NumberFigure 1-10 Hot Spare Operation1-18 System Overview