array site (where the S stands for spare). A four disk array also effectively uses 1 disk for parity, so it is referred to as a 3+P array.
In a DS6000, a
Drive failure
When a disk drive module (DDM) fails in a
While this data reconstruction is going on, the device adapter can still service read and write requests to the array from the hosts. There may be some degradation in performance while the sparing operation is in progress, because some controller and switched network resources are being used to do the reconstruction. Due to the switched architecture, this effect will be minimal. Additionally, any read requests for data on the failed drive require data to be read from the other drives in the array to reconstruct the data. The remaining requests are satisfied by reading the drive containing the data in the normal way.
Performance of the
3.3.2 RAID-10 overview
RAID-10 theory
RAID-10 implementation in the DS6000
In the DS6000 the
Chapter 3. RAS 53