Adaptec CDP-00277-01-A Installation And User Manual

Also see for ASR-71605: User guide

Contents

• If it is a RAID 0 array, see Disk Drive Failure in a RAID 0 Array on page 57.• If multiple disk drives fail within the same array, see Multiple Failures in the Same Array on page57.• If the drive is part of the maxCache Container, see Failed SSD in maxCache Container on page 58.Note: maxView Storage Manager uses the term logical drives or logical devices whenreferring to arrays (see Terminology Used in this Guide on page 13).Failed Disk Drive Protected by a Hot SpareWhen an array is protected by a hot spare, if a disk drive in that array fails the hot spare is automaticallyincorporated into the array and takes over for the failed drive.To recover from the failure:1. Remove and replace the failed disk drive.2. If copyback is not enabled—In maxView Storage Manager, remove the ‘hot spare’ designation fromthe original hot spare (the disk drive that was built into the array). Then, designate a new hot spareto protect the arrays on that controller.If copyback is enabled—Data is automatically moved back to its original location once the controllerdetects that the failed drive has been replaced. No action is required.Failed Disk Drive Not Protected by a Hot SpareWhen an array is not protected by a hot spare, if a disk drive in that array fails, remove and replace thefailed disk drive. The controller detects the new disk drive and begins to rebuild the array.If the controller fails to rebuild the array, check that the cables, disk drives, and controllers are properlyinstalled and connected. Make sure that the new disk drive is equal or greater in size than the faileddisk drive. Then, if necessary, use maxView Storage Manager to rebuild the array. For instructions, referto the maxView Storage Manager User’s Guide or online Help.Failure in Multiple Arrays SimultaneouslyIf there's a disk drive failure in more than one array at the same time (one failure per array), and thearrays have hot spares protecting them, the controller rebuilds the arrays with these limitations:• A hot spare must be of equal or greater size than the failed disk drive it's replacing.• Failed disk drives are replaced with hot spares in the order in which they failed. (The array thatincludes the disk drive that failed first is rebuilt first, assuming an appropriate hot spare isavailable—see bullet above.)If there are more disk drive failures than hot spares, see Failed Disk Drive Not Protected by a Hot Spareon page 57.If copyback is enabled, data is moved back to its original location once the controller detects that thefailed drive has been replaced.Disk Drive Failure in a RAID 0 ArrayBecause RAID 0 volumes do not include redundancy, if a disk drive fails in a RAID 0 array, the data can’tbe recovered.Correct the cause of the failure or replace the failed disk drives. Then, restore your data (if available).Multiple Failures in the Same ArrayExcept in RAID 6 and RAID 60 arrays (see Understanding RAID on page 64), if more than one disk drivefails at the same time in the same array, the data normally can't be recovered.You may be able to recover the data by forcing the logical drive online or by recreating the logical drivewithout the initialization step. You can use the BIOS utility, ARC (see About the Adaptec RAID ConfigurationUtility on page 54), the command-line utility, ARCCONF, or maxView Storage Manager. For moreinformation, refer to the Adaptec RAID Controller Command Line Interface User’s Guide and the maxViewStorage Manager User's Guide.57Proprietary and Confidential to PMC-Sierra, Inc.Document No.: CDP-00277-01-A Rev. A, Issue:Serial Attached SCSI RAID Controllers Installation and User's Guide