Teej, I gave up making Xen work reliably on Ubuntu 8.04 months ago. After weeks of struggle, it became clear that Xen in 8.04 was basically abandoned... kernels that didn't work, broken networking, fixes upstream for a year that were never released, etc. We have instead opted to go with KVM.
Scott On Tue, Jun 22, 2010 at 11:50 AM, Teej <[email protected]> wrote: > Thank you for taking the time to report this bug and helping to make Ubuntu > better. We are sorry that we do not always have the capacity to look at all > reported bugs in a timely manner. > There have been many changes in Ubuntu since that time you reported the bug > and your problem may have been fixed with some of the updates. It would help > us a lot if you could test the current Ubuntu development version (10.10). > If you can test it, and it is still an issue, we would appreciate if you > could upload updated logs by running apport-collect <bug #>, and any other > logs that are relevant for this particular issue. > > -- > Xen dom0 crash when writing to LVM volume with DELL PERC 5/i RAID > https://bugs.launchpad.net/bugs/227120 > You received this bug notification because you are a direct subscriber > of the bug. > > Status in “xen-source” package in Ubuntu: Incomplete > > Bug description: > Release: 8.04 (server) > Kernel server version: linux-image-2.6.24-16-server 2.6.24-16.30 > kernel xen version: linux-image-2.6.24-16-xen > 2.6.24-16.30 > > Hardware: Dell PowerEdge 2950 with a PERC 5/9i RAID controller > > r...@phaethon:/tmp# df > Filesystem 1K-blocks Used Available Use% Mounted on > /dev/mapper/phaethon-phaethon--root > 41612608 2358764 37156692 6% / > varrun 1031152 44 1031108 1% /var/run > varlock 1031152 0 1031152 0% /var/lock > udev 1031152 68 1031084 1% /dev > devshm 1031152 0 1031152 0% /dev/shm > /dev/sda1 93307 44810 43680 51% /boot > > With these logical volumes in the phaethon volume group: > r...@phaethon:/tmp# lvscan > ACTIVE '/dev/phaethon/phaethon-root' [40.00 GB] inherit > ACTIVE '/dev/phaethon/test-lv' [10.00 GB] inherit > ACTIVE '/dev/phaethon/xen-test-lv' [10.00 GB] inherit > > When I am running under the Xen kernel and I try to do a moderately heavy > write to any LVM LV other than the root partition the box crashes. The > crash is coming out of the megaraid/megaraid_sas.c file. > > Running under the server kernel this does not crash. > > This looks like it is caused by a bug in the megaraid driver that was > patched October 1, 2007: > http://kerneltrap.org/mailarchive/linux-kernel/2007/10/1/328726 > A quick check of the source code for the xen and server kernels' shows that > the patch above is not integrated into the Ubuntu kernels. > > The Xen kernel is using the "cfq" IO scheduler rather than the "deadline" > scheduler that the server kernel uses. This seems to be putting more > "pressure" on the raid controller. That notion comes from some of the notes > about the various crashes on Dell's mailing lists, and some other source > that I can't seem to find anymore. > > I haven't yet tried rebuilding the Xen kernel using the "deadline" > scheduler. In large part, that's because I haven't been able to figure out > why the scheduler was changed. > > Dell officially supports RHEL5 on this hardware, and the RHEL5/Centos5 > megaraid drivers look quite different. I haven't tried taking the RHEL5 > driver and using it on the Ubuntu system. That's a task for tomorrow. > > To unsubscribe from this bug, go to: > https://bugs.launchpad.net/ubuntu/+source/xen-source/+bug/227120/+subscribe > -- Scott Wimer [email protected] -- Xen dom0 crash when writing to LVM volume with DELL PERC 5/i RAID https://bugs.launchpad.net/bugs/227120 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
