Bug 591703 (LibvirtAIO)
| Summary: | RFE: libvirt XML should allow to specify AIO mode | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Jes Sorensen <Jes.Sorensen> |
| Component: | libvirt | Assignee: | Eric Blake <eblake> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | urgent | ||
| Version: | 6.0 | CC: | abaron, aliguori, berrange, cpelland, dallan, eblake, gcosta, Jes.Sorensen, llim, merlin.linux, mzhan, nzhang, plyons, xen-maint, yoyzhang |
| Target Milestone: | rc | Keywords: | FutureFeature |
| Target Release: | 6.1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | libvirt-0.8.7-5.el6 | Doc Type: | Enhancement |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-05-19 13:18:49 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 592070 | ||
| Bug Blocks: | 611206, 628871, 644849 | ||
|
Description
Jes Sorensen
2010-05-12 20:52:41 UTC
A preliminary patch was proposed upstream: https://www.redhat.com/archives/libvir-list/2010-April/msg00786.html https://www.redhat.com/archives/libvir-list/2010-April/msg00888.html but missed inclusion into libvirt 0.8.1. This feature request did not get resolved in time for Feature Freeze for the current Red Hat Enterprise Linux release and has now been denied. You may re-open your request by requesting your support representative to propose it for the next release. Upstream discussion[1] on the initial patch pointed out that a better solution than adding a qemu-specific <disk type="..." aio="threads"/> might be to instead support: <disk type="..."> <iobackend type="aiothreads"/> </disk> to allow further iobackend types among other hypervisors. Until the XML representation is nailed down, this is not yet ready for inclusion. [1] https://www.redhat.com/archives/libvir-list/2010-May/msg00538.html Upstream is still hashing out the best XML representation: https://www.redhat.com/archives/libvir-list/2011-January/msg00066.html but it should be easy to modify the existing patch mentioned in comment 6 to match whatever naming conventions is ultimately agreed on, in time for RHEL 6.1. Upstream patch posted, based on fallout from discussion. https://www.redhat.com/archives/libvir-list/2011-January/msg00694.html Posted for inclusion in RHEL 6.1: http://post-office.corp.redhat.com/archives/rhvirt-patches/2011-January/msg01500.html Verified with the following packages, it's already been fixed.
libvirt-0.8.7-6.el6.x86_64
qemu-kvm-0.12.1.2-2.144.el6.x86_64
kernel-2.6.32-115.el6.x86_64
# virsh dumpxml demo
...
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none' io='native'/>
<source file='/var/lib/libvirt/images/demo.img'/>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0' unit='0'/>
</disk>
...
# ps -ef | grep qemu-kvm | grep aio
root 6778 1 8 04:57 ? 01:26:27 /usr/libexec/qemu-kvm -S -M rhel6.1.0 -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 -name demo -uuid 4e70a311-e9f2-f5e8-e651-37d4a94c5f3e -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/demo.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-reboot -boot d -drive file=/var/lib/libvirt/images/demo.img,if=none,id=drive-ide0-0-0,format=raw,cache=none,aio=native
...
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2011-0596.html |