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xen-devel
Re: [Xen-devel] xm/xl block-detach issue
On 10.07.2011 20:19, Daniel Stodden wrote:
Okay, that needs to get fixed, but I don't know where. In XCP
that's how
it's exclusively done, because it's the most general approach.
My guess at the moment is that it might be a problem with blktap and
vhd or, blktap and my kernel combo, or blktap and my kernel combo
and vhd :)
The kernel i'm actually playing with is: 2.6.39.2-xen-stable +
blktap, built over a debian squeeze like this:
git clone
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git
linux_xen_2.6.39.x-stable
cd linux_xen_2.6.39.x-stable
git checkout -b stable/2.6.39.x origin/stable/2.6.39.x
git remote
add daniel git://xenbits.xensource.com/people/dstodden/linux.git
git fetch daniel
git merge daniel/blktap/next-2.6.39
make menuconfig (removing useless stuff, activating the needed
ones)
make bzImage -j9 ; make modules -j9 ; make modules_install
[ etc ... ]
Playing more with it this morning I managed to start a vm with a
vhd file for the disk (after provisioning it with some files and
reboots...) , with this config:
box# cat /cloud/data2/configs/vm1.test.cfg
bootloader = "/usr/bin/pygrub"
memory = 1024
name = "vm1"
vcpus = 4
#vif = [ 'ip=10.111.5.10, bridge=trunk0, vifname=vm1.0' ]
disk = [ 'tap2:vhd:/cloud/data2/machines/vm1.vhd,xvda,w' ]
root = "/dev/xvda1"
extra = "fastboot"
vm1 is up and rocking
box# xl list
Name ID Mem VCPUs
State Time(s)
Domain-0 0 1024 16
r----- 26.2
vm1 2 1024 4
-b---- 2.8
But now if I issue a ps -aux in the dom0, it displays some
process then hangs the ps.
(that was not the case before I start vm1)
And if I try to list the attached block devices with xl:
box# xl
block-list 2
Vdev BE handle state evt-ch ring-ref
BE-path
Segmentation fault
(dmesg)
[ 1592.151122] xl[2292]: segfault at 0 ip 00007f7de314e6d2 sp
00007fff610e30b0 error 4 in libc-2.11.2.so[7f7de3117000+158000]
but works if i try to list it with xm:
box# xm block-list 2
Vdev BE handle state evt-ch ring-ref BE-path
51712 0 0 4 23 8
/local/domain/0/backend/vbd/2/51712
I'll try with something else than vhd to see if the same
happens, but my goal is to use vhd's ...
Can you check if it works with some normal disk? Check out
modules,
install lvm2, make sure you have dm-linear loaded, etc... You were
running a custom kernel, right? You're probably just missing sth.
modules lists:
root@xen-blade15:~# lsmod
Module Size Used by
blktap 17941 8
ocfs2 618206 1
quota_tree 7539 1 ocfs2
ocfs2_dlmfs 17331 1
ocfs2_stack_o2cb 3482 1
ocfs2_dlm 204671 1 ocfs2_stack_o2cb
ocfs2_nodemanager 186569 14
ocfs2,ocfs2_dlmfs,ocfs2_stack_o2cb,ocfs2_dlm
ocfs2_stackglue 7437 3 ocfs2,ocfs2_dlmfs,ocfs2_stack_o2cb
dm_round_robin 2260 1
configfs 21658 2 ocfs2_nodemanager
crc32c 2688 8
iscsi_tcp 8503 6
libiscsi_tcp 11604 1 iscsi_tcp
libiscsi 34844 2 iscsi_tcp,libiscsi_tcp
scsi_transport_iscsi 28673 3 iscsi_tcp,libiscsi
openvswitch_mod 71205 3
xenfs 9815 1
xfs 501098 1
ext2 61369 1
sg 27333 0
sr_mod 14760 0
cdrom 35494 1 sr_mod
xen_evtchn 4739 2
loop 16002 0
tpm_tis 7821 0
tpm 10878 1 tpm_tis
i7core_edac 15891 0
tpm_bios 4921 1 tpm
dcdbas 5416 0
edac_core 34483 1 i7core_edac
evdev 9374 4
usb_storage 43361 0
thermal_sys 14045 0
pcspkr 1779 0
acpi_processor 5423 0 [permanent]
button 4199 0
usbhid 34740 0
hid 78436 1 usbhid
ext4 255423 1
mbcache 5434 2 ext2,ext4
jbd2 48549 2 ocfs2,ext4
crc16 1319 1 ext4
dm_multipath 16384 2 dm_round_robin
scsi_dh 4876 1 dm_multipath
dm_mod 63657 7 dm_multipath
sd_mod 34293 6
crc_t10dif 1292 1 sd_mod
uhci_hcd 21828 0
megaraid_sas 70747 3
ehci_hcd 37665 0
scsi_mod 144719 9
iscsi_tcp,libiscsi,scsi_transport_iscsi,sg,sr_mod,usb_storage,scsi_dh,sd_mod,megaraid_sas
usbcore 137744 5 usb_storage,usbhid,uhci_hcd,ehci_hcd
bnx2 70964 0
My vhd storage is on an ocfs2 shared storage attached with multipath
iscsi. I will try it on a local storage too to eliminate
that possible cause.
Thanks for your time Daniel.
Sébastien
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