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We use a vendor brand SAN with fiber channels. We have 200 virtual machines. &nbsp;I've tried to move the affected VM to another datastore and same result. I've been monitoring this same virtual machine and in a 1 hour period, it spike to 359ms one time and another to alittle over 100ms. Again, only read, write never spikes over 10-20ms. &nbsp;We currently have 4 datastores with DRS turned on. &nbsp;It's roughly 5-10 users out of the 200. &nbsp;Different Host and Different Datastores. &nbsp;Too many variables, hence the reason I'm asking here...
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I would say simple operational tasks. &nbsp;The affected folks are business, not IT or anything like that. &nbsp;They might have several office apps open at the same time, IE, nothing major really.
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We have several users complaining of slowness on their virtual desktops. &nbsp;When looking at monitoring in VSphere, I notice high spikes of read latency. &nbsp;Write latency, no issues. &nbsp;The virtual machines are 1 CPU, 2 Cores, 32-bit windows 7 machines with vmagent 5.3.5. &nbsp;Hosts are ESX Cisco UCS boxes running 5.5. &nbsp;<br />
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Any suggestions
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We have several users complaining of slowness on their virtual desktops.  When looking at monitoring in VSphere, I notice high spikes of read latency.  Write latency, no issues.  The virtual machines are 1 CPU, 2 Cores, 32-bit windows 7 machines with vmagent 5.3.5.  Hosts are ESX Cisco UCS boxes running 5.5.  

Any suggestions

Read Latency on Virtual desktops

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.

VMware

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.