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vSphere UI behavior change for VM Disk I/O Shares & Limits in vSphere 8.x

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If you use the vSphere UI to configure individual virtual disk I/O shares or limits for a Virtual Machine, it looks like this functionality has been removed in vSphere 8.x in favor of using VM Storage Policies, which has been around for almost a decade now.

Prior to vSphere 8.x, you could configure both disk shares and limits on an individual VMDK as shown in this screenshot below for a vSphere 7.x environment:


While this capability can be useful, it does come with some operational overhead of having to configure each and every virtual disk that has such a requirement and can certainly be error prone. Fortunately, this problem of defining various storage requirements and attributes for a VM and its virtual disks has already been solved with Storage Policy Based Management (SPBM) and the use of VM Storage Policies.

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Improved VM Storage Policy (Profile-driven storage) privileges in vSphere 8.x

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A couple of weeks ago I had noticed a few internal folks were asking about missing Profile-driven storage privileges in vSphere 8.x when referring to 2nd party VMware documentation asking for two privileges called "Profile-driven storage update" and "Profile-driven storage view" which no longer exists in vSphere 8.x when compared to the vSphere 7.x documentation.

At first, I thought this was purely a rename issue as the underlying feature of these privileges has always been known as VM Storage Policies, which is even used in the vSphere 7.x UI and has been around for quite some time. It looks like in earlier releases, the vSphere UI label for the privilege was still using the older name.

Here is a a screenshot of a vSphere 7.x environment where you can see the original two privilege names:


Here is a a screenshot of a vSphere 8.x environment, which now actually lists seven privileges, which has lead to some additional confusion.


Furthermore, it looks like these additional VM Storage Policy privileges have also not been updated in the vSphere 8.x documentation, which is currently a known issue and only references the renamed privileges.

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Quick Tip - How to monitor when ESXi filesystem and partitions are filling up?

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Here is another tidbit on how you can leverage the power of vSphere Events, which now includes over 2K+ as of vSphere 8.0 Update 1 to help monitor when an ESXi filesystem and/or partition is low on disk space.

With vSphere 6.7 or later, we have two events that you can use to help alert when either an ESXi ramdisk (e.g. /var) or VFAT partition (e.g. bootbanks) has filled up.

  • Ramdisk: esx.problem.visorfs.ramdisk.full
  • VFAT: esx.problem.vfat.filesystem.full.other

When either of these occur, you can easily find them under the Monitor->Events section for an ESXi host as shown in the screenshot below.

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