Cisco C240-M4SX / 12G SAS Embedded Raid Controller Queue depth Reporting resulting in ESXi 6.0

All,

We have been a customer of vSAN VMware 6.0 for the last 6 months of our environment entirely on servers of Cisco C240 M4SX with the Cisco 12 G SAS integrated Raid Controller.   Everything in the environment was working well until we started to bring in data warehouse loads in the environment and began to notice performance around latency of disk and most important issues still outstanding IO high.  After that ESXtop and ESXCFG examination we found that the length of the queue announced to the adapter ESXi has been only 234 however the VMware HCL Announces 895; 234 is below minimum spec of 256 to correctly implement vSAN.  We have worked diligently with VMware on it to try different versions certified and non certified driver async for this raid controller in addition to the most recent firmware for the raid controller.  Regardless of the change of the depth of the queue remained 234.  The presence of FBWC affect the depth of queue announced to the operating system?  VMware support has indicated that it is clearly a problem "hardware".  Any ideas as to what may be causing this?

Our environment:

C240-M4SX

Integrated 12G SAS Raid Controller (operation JBOD / pass-through, not FBWC)

UCSM 2.2 (6 c)

Driver of VMware for controller: 6.606.06.00 - 1OEM.550.0.0.1331820.x86_64.vib

VMware vSphere 6.0U1

Greetings.

Had the chance to spend some time in the laboratory and removed the cache module.

After that, I now get "207", so I would say it's confirmed that 1,2,4 GB cache modules are used to increase the depth/length of the queue for these controllers.

Thank you

Kirk

Tags: Cisco DataCenter

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