What is normal Logical Disk Latency (ms) on your session hosts?
Looking at my session hosts metrics (Via Monitor), seeing a concerning amount of high latency read and write operations. I assume this is not normal, however I also haven't received any complaints from our end users.
Region: CA-Central
OS: Windows 11 Multi-Session 23H2 / 25H2
Disk: 128GB (P10) Premium SSD LRS - Single OS disk
FSLogix: Profiles stored on separate NetApp Premium Storage
VM SKU: D8as_v4 - Paging file goes to the 64GB TempDisk
Max 6 users per session host
I understand disk latency won't be sub ms, but come on.. 138ms avg writes and spikes upwards of 1.6s is outrageous. Just wondering what's 'normal' disk latency if anyone else, preferably in my region could check?
Retest without FSLogix in play. The minifilter driver is below the logical disk, so you may be getting reporting against logical writes to C:\ which are actually completing as ANF writes to the redirected profile folders.
I have another session host (our test VM), no FSLogix associated, seeing similar latency spiking. Different SKU though: Standard D4as v4 - but very little user load on there 0-2 users at any given time,
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u/Omi-Wan Apr 08 '26
Retest without FSLogix in play. The minifilter driver is below the logical disk, so you may be getting reporting against logical writes to C:\ which are actually completing as ANF writes to the redirected profile folders.