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Bug
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Resolution: Not a Bug
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Undefined
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None
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rhel-9.4.z
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No
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Important
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rhel-virt-core-libvirt-2
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ssg_virtualization
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None
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False
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False
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None
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None
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None
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None
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Unspecified
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Unspecified
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Unspecified
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None
What were you trying to do that didn't work?
Set cache mode on lun block device in XML, the qemu command line of VM does not apply the cache mode.
What is the impact of this issue to you?
RHEL-86543 [DEV Task]: [QEMU] Retry SG_IO on error with multipath failover group policy
It needs to set the cache.direct=on on the blockdev node,example
-blockdev driver=host_device,filename=/dev/mapper/mpatha,cache.direct=on,node-name=drive_disk,pr-manager=helper0 \
-blockdev driver=raw,node-name=host_disk,file=drive_disk \
-device scsi-block,bus=scsi1.0,drive=host_disk,id=scsi0-0-0-0
Please provide the package NVR for which the bug is seen:
Red Hat Enterprise Linux release 9.5 (Plow)
5.14.0-427.13.1.el9_4.x86_64
device-mapper-1.02.198-2.el9.x86_64
device-mapper-multipath-0.8.7-32.el9.x86_64
qemu-kvm-9.0.0-10.el9_5.2.x86_64
seabios-bin-1.16.3-2.el9_5.1.noarch
edk2-ovmf-20240524-6.el9_5.3.noarch
libvirt-10.5.0-7.5.el9_5.x86_64
How reproducible is this bug?:
100%
Steps to reproduce
- vm XML
<disk type="block" device="lun"> <driver name="qemu" type="raw" /> <source dev="/dev/sdc" /> <target dev="sdc" bus="scsi" /> </disk> <!-- cache empty --> <disk type="block" device="lun" cache="default"> <driver name="qemu" type="raw" /> <source dev="/dev/sdd" /> <target dev="sdd" bus="scsi" /> </disk> <!-- cache empty --> <disk type="block" device="lun" cache="none"> <driver name="qemu" type="raw" /> <source dev="/dev/sde" /> <target dev="sde" bus="scsi" /> </disk> <!-- cache empty --> <disk type="block" device="lun" cache="directsync"> <driver name="qemu" type="raw" /> <source dev="/dev/sdf" /> <target dev="sdf" bus="scsi" /> </disk> <!-- cache empty --> <disk type="block" device="lun" cache="writeback"> <driver name="qemu" type="raw" /> <source dev="/dev/sdg" /> <target dev="sdg" bus="scsi" /> </disk> <!-- cache empty --> <disk type="block" device="lun" cache="writethrough"> <driver name="qemu" type="raw" /> <source dev="/dev/sdh" /> <target dev="sdh" bus="scsi" /> </disk>
- Boot vm to check the qemu command line
-blockdev {"driver":"host_device","filename":"/dev/sdc","node-name":"libvirt-6-storage","read-only":false} \
-device {"driver":"scsi-block","bus":"scsi0.0","channel":0,"scsi-id":0,"lun":2,"drive":"libvirt-6-storage","id":"scsi0-0-0-2"} \
-blockdev {"driver":"host_device","filename":"/dev/sdd","node-name":"libvirt-5-storage","read-only":false} \
-device {"driver":"scsi-block","bus":"scsi0.0","channel":0,"scsi-id":0,"lun":3,"drive":"libvirt-5-storage","id":"scsi0-0-0-3"} \
-blockdev {"driver":"host_device","filename":"/dev/sde","node-name":"libvirt-4-storage","read-only":false} \
-device {"driver":"scsi-block","bus":"scsi0.0","channel":0,"scsi-id":0,"lun":4,"drive":"libvirt-4-storage","id":"scsi0-0-0-4"} \
-blockdev {"driver":"host_device","filename":"/dev/sdf","node-name":"libvirt-3-storage","read-only":false} \
-device {"driver":"scsi-block","bus":"scsi0.0","channel":0,"scsi-id":0,"lun":5,"drive":"libvirt-3-storage","id":"scsi0-0-0-5"} \
-blockdev {"driver":"host_device","filename":"/dev/sdg","node-name":"libvirt-2-storage","read-only":false} \
-device {"driver":"scsi-block","bus":"scsi0.0","channel":0,"scsi-id":0,"lun":6,"drive":"libvirt-2-storage","id":"scsi0-0-0-6"} \
-blockdev {"driver":"host_device","filename":"/dev/sdh","node-name":"libvirt-1-storage","read-only":false} \
-device {"driver":"scsi-block","bus":"scsi1.0","channel":0,"scsi-id":0,"lun":0,"drive":"libvirt-1-storage","id":"scsi1-0-0-0"} \
Expected results
the cache mode may apply to qemu command line
Actual results
no cache definition
