A LUN is defined as the following:
A logical volume that is defined over a collection of drive groups and is addressed using SCSI protocol in a SAN. An administrator defines the QoS attributes of the LUN.
Use the Oracle Flash Storage System (GUI) to perform the following actions:
- Create a single tier or auto-tiered LUN.
- Modify the properties of a LUN.
- Map a LUN to specific SAN host entries or multiple host entries.
- Move a LUN from one Storage Domain to another.
- Enable and disable the data path to a LUN.
- Provide clone and copy operations on a LUN for various purposes, including data protection.
You assign the storage resources and QoS attributes when you create the LUN. As needs change, you can later modify the QoS attributes of the LUN, the storage capacity that is assigned to the LUN, or both. You can designate theLUN as auto-tier. With an auto-tiered LUN, the system continuously monitors its I/O and gathers statistics for analysis. From this analysis, data is placed on the tier that best matches its use.
Note: When you create a LUN, the system automatically sets the tiering level of the LUN to single tier. If you want to allow for automatic data migration to higher data tiers, change the LUN to an auto-tiered LUN. If you create an auto-tiered LUN when the system contains only one Storage Class, no data migration occurs until other Storage Classes are added to the system.
The
Oracle FS System creates two storage tiers for each Storage Class that is present in the Storage Domain. Depending on the type of Storage Class, the system assigns a RAID level for each tier. The administrator views the properties of the storage tier by accessing the
QoS properties and Storage Class. The following table defines the RAID levels by Storage Class.
Table 1 RAID level by Storage Class and storage tier| |
Storage tier |
|---|
| Storage Class |
Tier 1 |
Tier 2 |
|---|
| Capacity HDD |
RAID 6 |
Not available |
| Capacity SSD |
RAID 5 |
RAID 10 |
| Performance HDD |
RAID 5 |
RAID 10 |
| Performance SSD |
RAID 5 |
RAID 10 |
You can use the Oracle FS System Manager (GUI) to disable the data path to the LUN. Disabling the data path makes the LUN inaccessible to the SAN host.
To provide data protection for a LUN, you can clone the volume. You can manually clone or copy a LUN. You can also create a schedule so that the system automatically creates cloned LUNs at times that you define.