Near line SAS (NLSAS)
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We have referenced NLSAS quite a bit in the past few weeks and felt it was time to get into the nuts and bolts of what NLSAS is exactly.
A SATA drive has only one port so in the event of a network failure the SATA drive is not reachable. To add a level of HA to the SATA environment
interposers are utilized to add a second connectivity port while allowing conversion to another interface (i.e. Fibre Channel).
Switching the interposer to support NLSAS natively allows dual paths to your SAS environment.
What is gained by moving to NLSAS in your enterprise?
One drive type can be utilized across your enterprise; SAS.
Another is improved RAS (Reliability, Availability, Survivability)((In my mind this is minor since this RAS was also added to SATA offering).
The slight improvement in performance gain from native protocol exchange is really not worth mentioning as net gain.
Hope that helps clear the muddy water in / around NLSAS