Dear All,
how does RAID Tiering work, especially in SC 2000 series? Is data moved between different RAID levels? Is it really physically moved or is there any abstraction layer? Is there any other name for this technique?
Somewhere I found a powerpoint presentation that suggests that data was held simultaneously in RAID level 10 for write and level 5 or 6 for read access. Is this possible? Is there any caching technique? When is determined what "hot" data is?
Is tiering reasonable when there are SAS disks only, no SSDs (or SATA as lower level)?
Thank you in advance.
- Chris