Bug 479217
| Summary: | Full Virtualized Guest does not see "Virtual Disks" presented to it | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Hector Arteaga <hector.arteaga> |
| Component: | xen | Assignee: | Xen Maintainance List <xen-maint> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 5.3 | CC: | clalance, ddutile |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-01-13 00:07:25 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: | |||
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Description
Hector Arteaga
2009-01-08 02:59:39 UTC
Do you have the xen-vbd driver loaded in the guest? Without that, the guest will never see the virtual disk. Chris Lalancette Fixed in 2.6.18-128. I just tried the same experiment using 2.6.18-128 (RC1) with the same result. However, I noticed that if the VM is running when you add the "Virtual Disk" it does see the device. But then it is lost after you reboot the VM. I do have the xen-vbd driver loaded (version 2.6.18-125). [root@localhost ~]# lsmod | grep xen xen_vbd 49833 0 xen_vnif 58433 0 [permanent] xen_balloon 45641 1 xen_vnif,[permanent] xen_platform_pci 118685 3 xen_vbd,xen_vnif,xen_balloon,[permanent] [root@localhost ~]# modinfo xen_vbd filename: /lib/modules/2.6.18-125.el5/kernel/drivers/xenpv_hvm/blkfront/xen-vbd.ko license: Dual BSD/GPL alias: xen:vbd srcversion: 2DE57D18B4C08FDBDC27998 depends: xen-platform-pci vermagic: 2.6.18-125.el5 SMP mod_unload gcc-4.1 OK, the fact that it gets lost after you reboot the VM is the correct behavior; things you attach on the fly get lost. Only things in the configuration file are persistent. What's the exact command-line you used to attach the disk? Chris Lalancette Oh, also, please get the xend.log and the output from xm list --long from right before and right after you tried to attach the disk. Thanks, Chris Lalancette Did you update just the guest kernel?
I had the same complaint from our perf team yesterday,
made the same recommendation, and the perf team member did
a full update of the guest (not just kernel to -128) to -rc1 &
that resolved the problem for them.
and can you provide a dump of:
Provide a dump of ' grep vbd /lib/modules/2.6.18-128.el5/modules.* '
I want to make sure the dependencies are correct.
- Don
Chris: could he be missing any bug fix to the dom0 tools
&/or back-end drivers due to the increased num of vbd patch?
re: comment #3: If you upgraded to -128/rc1, then the xen-vbd modinfo should report version -128, not -125. Therefore, either you didn't boot & test the -128 kernel, or the xen-vbd dependencies are seriously messed up. Please ensure that uname -a reports -128 when you do the modinfo xen-vbd check. *Also*, do a modinfo check on xen-platform-pci; that *must* show -128; the bug fix is in that module. Thanks, Don Dutile I tried again with RC2. This time I loaded the VM from scratch as apposed to the upgrade and I no longer see the issue. I beleve you were correct in you diagnosis Don. Thanks for your help. Closing the bug -Hector Arteaga |