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  about 9 years ago by jfehlig | Reply

  I've made quite a bit of progress on this project thus far. First I had to introduce a conf file (/etc/libvirt/libxl.conf) to control behavior of the libxl driver. I needed to add a knob to go with the new conf file and decided on something simple: a bool to control autoballooning of domain0.

  On top of this patch I have a rather large patch that provides integration with libvirt's LockManager. sanlock or virtlockd can be used as the lock manager. Using virtlockd, I've been able to successfully prevent starting a domain on a host when the image used by the domain is in use by another domain on the same (or another) host.

  There is still lots of cleanup to do and corner cases to handle before I can send a V1 of the patch series to libvirt devel mail list. E.g. acquiring and dropping locks needs to be handled in migration, save, restore, pause, etc.

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I've made quite a bit of progress on this project thus far. First I had to introduce a conf file (/etc/libvirt/libxl.conf) to control behavior of the libxl driver. I needed to add a knob to go with the new conf file and decided on something simple: a bool to control autoballooning of domain0. On top of this patch I have a rather large patch that provides integration with libvirt's LockManager. sanlock or virtlockd can be used as the lock manager. Using virtlockd, I've been able to successfully prevent starting a domain on a host when the image used by the domain is in use by another domain on the same (or another) host. There is still lots of cleanup to do and corner cases to handle before I can send a V1 of the patch series to libvirt devel mail list. E.g. acquiring and dropping locks needs to be handled in migration, save, restore, pause, etc.
 
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Reply to jfehlig
I've made quite a bit of progress on this project thus far. First I had to introduce a conf file (/etc/libvirt/libxl.conf) to control behavior of the libxl driver. I needed to add a knob to go with the new conf file and decided on something simple: a bool to control autoballooning of domain0.
On top of this patch I have a rather large patch that provides integration with libvirt's LockManager. sanlock or virtlockd can be used as the lock manager. Using virtlockd, I've been able to successfully prevent starting a domain on a host when the image used by the domain is in use by another domain on the same (or another) host.
There is still lots of cleanup to do and corner cases to handle before I can send a V1 of the patch series to libvirt devel mail list. E.g. acquiring and dropping locks needs to be handled in migration, save, restore, pause, etc.
---
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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• 

  about 9 years ago by jfehlig | Reply

  It has been a successful week for this project! I'm able to prevent starting a domain that contains a disk being used by another domain:

  host1 # virsh create sles12pv.xml

  Domain sles12gm-pv created from sles12pv.xml

  host2 # virsh create sles12pv.xml

  error: Failed to create domain from sles12pv.xml

  And prevent attaching a disk that is being used by another domain:

  error: resource busy: Lockspace resource '/mnt1/sles12gm-pv/disk0.raw' is locked

  host1 # virsh attach-device sles12pv disk.xml --live

  Device attached successfully

  host2 # virsh attach-device sles12hvm disk.xml --live

  error: Failed to attach device from disk.xml

  error: resource busy: Lockspace resource '/mnt1/images/blank-raw.disk' is locked

  I had time to cleanup the patch series and make it presentable as a V1 upstream

  https://www.redhat.com/archives/libvir-list/2015-April/msg00845.html

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Edit Comment 1326
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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It has been a successful week for this project! I'm able to prevent starting a domain that contains a disk being used by another domain: host1 # virsh create sles12pv.xml Domain sles12gm-pv created from sles12pv.xml host2 # virsh create sles12pv.xml error: Failed to create domain from sles12pv.xml And prevent attaching a disk that is being used by another domain: error: resource busy: Lockspace resource '/mnt1/sles12gm-pv/disk0.raw' is locked host1 # virsh attach-device sles12pv disk.xml --live Device attached successfully host2 # virsh attach-device sles12hvm disk.xml --live error: Failed to attach device from disk.xml error: resource busy: Lockspace resource '/mnt1/images/blank-raw.disk' is locked I had time to cleanup the patch series and make it presentable as a V1 upstream https://www.redhat.com/archives/libvir-list/2015-April/msg00845.html
 
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Reply to jfehlig
It has been a successful week for this project! I'm able to prevent starting a domain that contains a disk being used by another domain:
host1 # virsh create sles12pv.xml
Domain sles12gm-pv created from sles12pv.xml
host2 # virsh create sles12pv.xml
error: Failed to create domain from sles12pv.xml
And prevent attaching a disk that is being used by another domain:
error: resource busy: Lockspace resource '/mnt1/sles12gm-pv/disk0.raw' is locked
host1 # virsh attach-device sles12pv disk.xml --live
Device attached successfully
host2 # virsh attach-device sles12hvm disk.xml --live
error: Failed to attach device from disk.xml
error: resource busy: Lockspace resource '/mnt1/images/blank-raw.disk' is locked
I had time to cleanup the patch series and make it presentable as a V1 upstream
https://www.redhat.com/archives/libvir-list/2015-April/msg00845.html
---
# A First Level Header
## A Second Level Header

Use one asterisk to *emphasize*

Use two asterisks for **strong emphasis**

* Use asterisks
* for lists

This is an [example link](http://example.com/)

This is an ![example image](http://paste.opensuse.org/view/raw/68957446)

This is a user link @hans

This is a project link hw#some-cool-title
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