Comments on: Disable SIOC IO Metrics Collection For Auto Tiering Storage Systems

By: Nutanix Acropolis hypervisor (AHV) vs Vmware vSphere hypervisor, AOS 5.5 edition – DontPokeThePolarBear

Wed, 13 Dec 2017 12:54:36 +0000

[…] Yes, Vmware has SIOC and SDRS, but these don’t really work with modern flash arrays or HCI environments. In fact if you are using Vmware with Nutanix or any other platform with advanced storage auto-tiering capabilities, it is advisable to turn SIOC off […]

By: mavatko

mavatko — Mon, 13 Feb 2017 12:49:52 +0000

I’m using autotiering with SIOC manual threshold reasonably high – depending on tiers, but usually 30ms works pretty well. In this configuration you can still benefit from SIOC to some extend – till autotiering kicks in and migrates extends to the higher tier.

AFAIK Storage spikes are caused by SIOC injector which is used if you have Percentage of peak throughput configured with SIOC, which is unfortunately default settings nowadays.

By: @vcdxnz001

@vcdxnz001 — Thu, 08 Dec 2016 23:51:56 +0000

In reply to Shaun D. Hi Shaun, I've just updated the post with a link to how to disable stats collection using PowerCLI.

By: AHV vs Vmware, AOS 5.0 edition – DontPokeThePolarBear

AHV vs Vmware, AOS 5.0 edition – DontPokeThePolarBear — Fri, 02 Dec 2016 08:20:16 +0000

By: vcdxnz001

vcdxnz001 — Tue, 22 Nov 2016 02:51:47 +0000

In reply to Ted. Yes it can impact performance and send false data to systems that do auto tiering.

By: Ted

Ted — Tue, 22 Nov 2016 02:28:18 +0000

Maybe I’m misunderstanding things but are you saying having the stats on affects performance of running vms or just gives false alerts?

The way I read this option it’s just collecting statistics (used for SDRS I guess) but doesn’t actually do anything to affect performance since Storage I/O control is off. At worst it’s reporting false positives and feeding false data to SDRS (so the latter might make bad decisions). If you don’t use SDRS, is there any harm in having this on?

By: vcdxnz001

vcdxnz001 — Sat, 12 Nov 2016 17:31:01 +0000

In reply to Shaun D. Unfortunately disabling via PowerCLI doesn\'t seem to be trivial. I haven\'t been able to find an easy command to use either.

By: Shaun D

Shaun D — Fri, 04 Nov 2016 17:37:14 +0000

Any ideas on how to disabled this via Powershell or Cli? Trying to find the right command to use.

By: vcdxnz001

vcdxnz001 — Sat, 22 Oct 2016 01:35:48 +0000

In reply to Shaun D. Thanks for the feedback. Unless you need it, might be a good idea to disable it.

By: Shaun D

Shaun D — Fri, 21 Oct 2016 17:29:53 +0000

Interesting….I just checked my hosts and we have this enabled as well ( unchecked ). However we are running ESXi 5.5 and vCenter 6.0.