Chapter 10: Heterogeneous Disk Arrays - HDAs


Heterogeneous Disk Arrays - HDAs allow multiple Virtual Arrays - VAs at different RAID levels to share disk space using multifunction controllers. The RAID level and organization of VAs is determined by reliability and workload requirements, e.g., RAID1 is suited for OLTP with high access rates to small data blocks, while RAID5 is better suited for parallel accesses to large files. Allowing variable RAID levels conserves disk bandwidth, because not all VAs need to be allocated with the highest redundancy level required by a subset of datasets.


Heterogeneous Disk Array - HDA; HP AutoRAID; HP Disk Array Designer; Oracle stripe and mirror everywhere; virtual arrays; virtual disks; clustered ...

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