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Known affected version(s) that were inferred because the vendor did not provide any: 7.0.3.01800
When you edit an existing IOPS limit based policy on Storage I/O Control (SIOC) by using Storage Policy Based Management (SPBM), you might see significantly slower VM performance. Normally, when you set an SPBM policy, IOPS limits are handled by an I/O filter, while mClock, the default I/O scheduler, handles reservations and shares. Due to a logic fault, when you change an existing IOPS limit, I/Os might throttle at the mClock scheduler instead at the I/O filter. As a result, I/Os get with a significant delay to the I/O filter which causes a drop in the I/O throughput of virtual machines. This issue is resolved in this release. The fix makes sure that IOPS limits, reservations and shares are honored whenever a new policy is created, edited or restored back to datastore defaults.
https://techdocs.broadcom.com/us/en/vmware-cis/vsphere/vsphere/7-0/release-notes/vcenter-server-update-and-patch-releases/vsphere-vcenter-server-70u3q-release-notes.html
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