[RFC] [Kimchi] #1091: Allow to set disk performance options per guest and template
Propose: Allow user to set IO-mode, Caching and disk driver for disks Questions: 1) Allow user to set these parameters on Template? Or just for edit 2) How i can prevent some error by the user? Example: Windows cannot use iscsi driver. How can i created a dictionary to validate ?
Gallen sent me this: Hi, just a few quick thoughts:
Questions:
1) Allow user to set these parameters on Template? Or just for edit
Some host filesystems do not support all disk caching modes (For example, ZFS does not support cache=none). When attempting to run a guest (in a dir-type storage pool) on a host filesystem that does not support the selected disk caching mode, Kimchi will throw an error and fail to start the guest. (reproduced below) Including disk-caching settings in each template would ensure that the user does not have to remember to change the disk-cache setting for every guest.
2) How i can prevent some error by the user? Example: Windows cannot use iscsi driver. How can i created a dictionary to validate ?
It seems like Kimchi is already good at catching and displaying configuration errors that would prevent the VM from running. For the Windows/iscsi issue, the question (unless I am misunderstanding) seems to be more general: How hard do you want to try to make sure that the user has configured the VM settings correctly for their chosen guest OS. Thanks! Error: KCHVM0019E: Unable to start virtual machine zfs-tester. Details: internal error: process exited while connecting to monitor: 2017-02-09T20:19:07.281748Z qemu-system-x86_64: -drive file=/tank/virt-storage/f59abc76-b0b4-494b-85d1-7ff7f4a03970-0.img,format=qcow2,if=none,id=drive-virtio-disk0,cache=none: file system may not support O_DIRECT 2017-02-09T20:19:07.281816Z qemu-system-x86_64: -drive file=/tank/virt-storage/f59abc76-b0b4-494b-85d1-7ff7f4a03970-0.img,format=qcow2,if=none,id=drive-virtio-disk0,cache=none: Could not open '/tank/virt-storage/f59abc76-b0b4-494b-85d1-7ff7f4a03970-0.img': Invalid argument On 02/09/2017 01:52 PM, Ramon Medeiros wrote:
Propose: Allow user to set IO-mode, Caching and disk driver for disks
Questions:
1) Allow user to set these parameters on Template? Or just for edit
2) How i can prevent some error by the user? Example: Windows cannot use iscsi driver. How can i created a dictionary to validate ?
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On 02/09/2017 01:52 PM, Ramon Medeiros wrote:
Propose: Allow user to set IO-mode, Caching and disk driver for disks
Questions:
1) Allow user to set these parameters on Template? Or just for edit
I'd say to only allow the user change those values on edit.
2) How i can prevent some error by the user? Example: Windows cannot use iscsi driver. How can i created a dictionary to validate ?
We will need to search about that. Which values are valid for each storage type. Maybe libvirt has some documentation about that.
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participants (2)
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Aline Manera -
Ramon Medeiros