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wilber822
Enthusiast
Enthusiast

Can monitor virtual disk change on VCOPS?

Hello everyone,

That's a question for DR problem.

As you may know, every change of LUN will be replicated to DR site. DR site may have problem if huge change happened on primary site and storage resource constrains in DR site.

Can I use VCOPS to find out which VM is having big changing on virtual disk?

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mark_j
Virtuoso
Virtuoso

Sure, you probably want to determine where your change-rate is coming from, right?

You'd want to look at Disk I/O, specifically  writes since that's your "change".

We have a few different attribute groups for Disk I/O, such as datastore, virtual disk, disk, storage, etc. Of these, you're going to get the most bang for your buck from the virtual disk attribute group for granular metrics, and the storage attribute group for your high-level metrics. The others vary in accuracy depending on the type of storage protocol/configuration you're using.

So let's say we want to look at virtual disk writes. You'll want to aggregate all of the virtual disk writes on a per-VM basis. This is already done for you under the following attribute:

Virtual Disk : Aggregate of all instances : Write Rate (KBps)

SO now that you've got the metric you want to look at, let's present it on a dashboard.

Add a Top-N analysis widget, config it do highest utilization based on metrics, then select the virtual machine and attribute "Virtual Disk : Aggregate of all instances : Write Rate (KBps)". Set the time period however you like, as well as # bars, etc.

Display it, and you'll have your list of VMs that are top contributors to the disk change rate.

*While I did answer you specific question, I want to remind you that if you're doing Storage vMotions, etc that will also impact your change rate since it is change blocks on the datastores.. VMs aren't the only cause.

If you find this or any other answer useful please mark the answer as correct or helpful.
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