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    Mystery IOPS - ESXi 5.5 Update 1

    CB_VM Novice

      ESXi 5.5 build 1881737 and vCenter Server 5.5 build 1623101  - We are seeing a lot of read and write IOPs from our ESXi hosts, we have 16 hosts cluster each with 6 LUNs and each LUN is doing between 5-8 read IOPs so we are getting over 1000 unexpected IOPs from the SAN. Only four ESXi hosts have guest and those IOPS are not coming from Guest.  All ESXi hosts are generating IOPS and those even don't have any guest.  Image attached and you can see 40 reads and 10 writes IOPS and no guests on that server. So 60 x 16 = 960 IOPS on SAN which is not from guests. I have rebooted the whole cluster and also re-scanned for datastores the whole cluster.  Already have opened the case with VMWARE and they requested the Cluster reboot (great) didn't worked as they suspected it may be  APD or PDL path issue. I checked all hosts manually and there are no dead paths.  We are using Dell M1000e Chassis / Dell620m blades and Dell EqualLogic PS6210XS ISCSI array and ESXi is insalled on SD cards. We are using software ISCSI adapter.  All the LUNS are seeing IOPS and those LUN don't even have any guests created yet. 

       

      Any thoughts how to fix that issue.

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