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If you suspect the storage then look at the storage management GUI, you won't diagnose a SAN problem using an OS or hypervisor diagnostic,
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If you suspect the storage then look at the storage management GUI, you won't diagnose a SAN problem using an OS or hypervisor diagnostic,

Armitage318

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Hi, I just found in storage's event log several error about &quot;command timeout&quot; on a specific disk.<br />
So, I will raise a ticket to Dell support for further analysis.
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Hi, I just found in storage's event log several error about "command timeout" on a specific disk.
So, I will raise a ticket to Dell support for further analysis.

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Hi, I have a cluster ESXi 6.0 with 9 nodes.<br />
I noticed very bad performances on different VMs on my infrastructure.<br />
According to resources utilization on entire cluster, I would exclude RAM / CPU issue.<br />
I suspect there is some issue on storage side (we use PowerEdge MD3200 / 3800) through iSCSI.<br />
I ran esxtop on some hosts, occasionally I noticed very high DAVG / KAVG values. <br />
My question is: what would you do next?<br />
Through esxtop I can find the &quot;affected&quot; lun.. isn't there a more efficient way to identify the VM (or VMs) that are causing performance issues?<br />
Thank you
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Hi, I have a cluster ESXi 6.0 with 9 nodes.
I noticed very bad performances on different VMs on my infrastructure.
According to resources utilization on entire cluster, I would exclude RAM / CPU issue.
I suspect there is some issue on storage side (we use PowerEdge MD3200 / 3800) through iSCSI.
I ran esxtop on some hosts, occasionally I noticed very high DAVG / KAVG values. 
My question is: what would you do next?
Through esxtop I can find the "affected" lun.. isn't there a more efficient way to identify the VM (or VMs) that are causing performance issues?
Thank you

Troubleshooting performace ESXi cluster

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.