Hello Nic, Today, three of our vSphere VMs running on iSCSI LIO 4.9.30 failed to create a backup snapshot and hung with errors like "Create virtual machine snapshot xxxxx. Unable to close the '/vmfs/volumes/.../xxxxx-000001-ctk.vmdk' file: 5 (Input/output error)." or other more general I/O errors. It always happened during snapshot creation and there were multiple "Detected MISCOMPARE + Target/iblock: Send MISCOMPARE check condition and sense" in target log at the same time. Subsequently, virtual machines lost access to their virtual disks and required VM reset. The failures seem to be independent of each other and VMs ran on different hosts. The storage was upgraded to 4.9.30 only two days ago. However, we have an identical iSCSI LIO storage running 4.9.27 more than three weeks without any issue in the same vSphere cluster. So I'm wondering if this could be caused by a stable target patch between 4.9.27 and 4.9.30. Quick look into changelog shows "target: Fix compare_and_write_callback handling for non GOOD status" as the only fix related to CAW since 4.9.27. What do you think? We have ESXi 5.5.0 rev. 5230635 on all ESXi nodes. Thank you. Martin -- To unsubscribe from this list: send the line "unsubscribe target-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
