Tag: scsi

SATA on Nutanix. Some experimental data.
By: Date: June 16, 2015 Categories: Storage Hardware and Devices Tags: , , ,

The question of  why  Nutanix uses SATA drive comes up sometimes, especially from customers who have experienced very poor performance using SATA on traditional arrays. I can understand this anxiety.  In my time at NetApp we exclusively used SAS or FC-AL drives in performance test work.  At the time there was a huge difference in performance between…

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Impact of Paravirtual SCSI driver VS LSI Emulation with Data.
By: Date: March 30, 2015 Categories: Debugging Tags: , ,

TL;DR  Comparison of Paravirtual SCSI Vs Emulated SCSI in with measurements.  PVSCSI gives measurably better response times at high load.  During a performance debugging session, I noticed that the response time on two of the SCSI devices was much higher than the others (Linux host under vmware ESX).  The difference was unexpected since all the devices…

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