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Active-Passive vsActive-ActiveStorage ControllersWhat you should know before you buy one?
What are storagecontrollers?
Storage controllers operate the storage arrays and control the data speed.
If a storage controller fails, the storage array will go offline and the data retrieval process will halt.
Storage controller is actually an x86 processor that:
Processes data i.e. De-duplication, compression, metadata handling, cloning including some other features.
Receives read & write requests from host (Fiber-channel or ISCSI channel)
And finally writes/reads to/from the disk.
Active-ActiveStorage Controllers
In active-active storage controller, both the controllers support logical unit numbers (LUNS) and their volumes.
The performance is downgraded but the process continues.
In the case one storage controller fails, the other continues to work.
Benefits ofActive-ActiveStoragecontroller
Active-Active controllers are low in cost.
Data center professionals love their higher performance levels.
Failure is rare so they don’t spend on buying an expensive storage controller when a lower priced one can do the job.
Drawbacks ofActive-ActiveStoragecontroller
One drawback of Active-Active storage controller is that the performance will drop if one storage controller fails.
Active-PassiveStorage Controllers
Benefits ofActive-PassiveStoragecontroller
Both controllers in active-passive mode provide the same speed, hence they are more expensive.
There is no drop in performance in case of a failure.
Drawbacks ofActive-PassiveStoragecontroller
The passive-storage controller remains idle for most of its life as the failure occurs rarely.
Which StorageController Should You Buy?Active-Active or Active-Passive?
Active-active storage controller provides adequate performance at minimum price. As failure is rare, majority IT professionals prefer these controllers.
Active-passive storage controllers are used by organizations because of their durability. The organizations include governments, libraries, social networks and similar others.
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