Slow VM disk performance on WS2012 Hyper-V cluster
hi everybody,
i having pretty annoying problem our hyper-v cluster. one, , 1 of our vms keeps getting state disk performance absolutely horrible (a few tens of kbps on sequential transfers). interactive performance in rdp affected.
however, live migration second node in cluster, performance goes should be. live migrating original cluster node keeps performance up, that until few hours later, @ couple of days, performance goes being horrible. apply, rinse, repeat.
in parent partition on cluster node, disk performance fine, irregardless of happens in vm. no abnormal cpu usage seen, either in parent, or in vm. no particular events logged either. live migration pretty slow when vm in affected state, moving performs observably faster (i.e., once problem "reset" through live migrating on second node).
the cluster ws2012, vm ws2012. functions file server, no other software installed, not antivirus. vm relatively large (4 vcpus, 32 gb ram, 120 gb dynamic vhdx system drive, , 24 tb dynamic vhdx storage file share).
there few mentions online similar problems, no concrete tips on cause it. have ideas?
hi everybody. waited little bit update, since wanted see if managed solve own issue - , @ least far looks might have, @ least has no longer manifested in last week or so.
my problem might have been fixed by the hotfix kb 2870270 (superseeded kb 2878635, problem description in previous hotfix kb), part:
"when use windows thin provisioning feature on windows server 2012-based computer, experience same i/o delays or i/o stalls occur during volume-unmounting process. "
i had install hotfix both on cluster nodes , inside vm - unfortunately hotfix description of issue/problem/solution sparse , vague, @ least far seems fix issue. of course, longer testing show if indeed fixed or not. worrying have other vms dynamic disks, problem didn't show, maybe overall size plays role well.
for reference, here answers questions above well: both boot , data vhdx on same lun , csv. "san" connected via sas, i.e. direct attached shared storage (a dell md3260 specifically, 2 luns, each in turn a csv on them). no other vms have shown issue. csv not going in redirected mode, , there nothing particuarlly suspicious shown @ hardware monitoring level in dell unit either.
Windows Server > Hyper-V
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