RHV Host receives errors blk_cloned_rq_check_limits: over max size limit and causes multipath paths to fail

Solution In Progress - Updated -

Issue

  • RHV operations related to offline snapshot merge, disk migration, cloning fail with below errors, indicating all paths to Storage domain was lost and throwing I/O errors.
  • Unable to create any tasks on the master SD for which all operations fail.
syslog: Jun  5 12:43:50 redhat-host2 multipathd: sda: mark as failed
vdsm.log: 2017-06-05 12:43:49,648+1000 ERROR (tasks/3) [storage.Image] conversion failure for volume df2faef2-7e23-46fa-a438-7d13dfd545a4 (image:904)
qemu-img: error while writing sector 311296: Input/output error

Environment

  • Red Hat Virtualization 4.x
  • Red Hat Enterprise Virtualization 3.6
  • FC Storage with thin-provisioned LUNs
  • Red Hat Virtualization/Server host
    o kernel-3.10.0-514.16.1.el7.x86_64 and later
    o device-mapper-multipath-0.4.9-99.el7_3.3.x86_64
    o kpartx-0.4.9-99.el7_3.3.x86_64
    o qemu-kvm-rhev-2.6.0-28.el7_3.9.x86_64

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