DELL Poweredge RAID Failure.
Datlabs RAID Rapid Response Team are available 24 x 7 and have unparalleled experience in DELL PowerEdge RAID configured Servers with success rates second to non.
Our team have recovered:
- Failure of one or more hard drives
- Server hardware failure
- Faulty PERC controllers
- Incorrectly Rebuilt Arrays
- Systems Reconfigured in error.
fault tolerance is different for differing configs.
- RAID 0 configs are not tolerant drive failure. If any physical drive in the array fails, all RAID 0 logical drives in the same array also fail.
- RAID 1 and RAID 10 configurations tolerate multiple drive failures if no failed drives are mirrored to one another.
- RAID 5 configurations tolerate one drive failure.
- RAID 50 configurations tolerate one failed drive in each parity group.
- RAID 6 configurations tolerate two failed drives at a given time.
- RAID 60 configurations tolerate two failed drives in each parity group.
- RAID 1 (ADM) and RAID 10 (ADM) configurations.
Before replacing drives ensure that the array has a current valid backup.
Confirm that the replacement drive is of the same type as the degraded drive (either SAS or SATA and either hard drive or solid state drive) also that the replacement drive has a capacity equal to or larger than the capacity of the smallest drive in the array. The controller will immediately fails if a drive is introduced that has insufficient capacity.
Systems with External Data Storage.
Ensure that the server is the first unit to be powered down and the last unit to be powered up.
Replacing RAID Hard Disk Drives.
Drives are replaced when they have failed or when the system needs a capacity upgrade.
In fault-tolerant configuration, hot-plug hard drives can be replaced when server is ON, but in case of a Non-hot-plug hard drive, it should be replaced when server is OFF.
If fault tolerance is compromised, the controller cannot reconstruct the data, and the data is likely to be lost permanently.
Time Required For A Rebuild.
The time required for a rebuild depends on several factors:
- The priority that the rebuild is given over normal I/O operations
- The amount of I/O activity during the rebuild operation.
- The average bandwidth capability (MBps) of the drives.
- The availability of drive cache.
- The brand, model, and age of the drives.
- The amount of unused capacity on the drives.
- For RAID 5 and RAID 6, the number of drives in the array.
- The stripe size of the logical volume.
- Firmware versions of the Smart Array Controller and Hard Disk Drive.
A System could be unprotected against hard disk drive failure for an extended period during rebuild and upgrade. When possible, perform rebuild during periods of low system utilization.