Nick Couchman schrieb:
I'm running SLES10 SP1 and have been using file:/ for my file-backed domUs.
The domUs sit on a shared OCFS2 SAN-backed filesystem and are run on my three
or four XEN servers. I'm having issues with the loopback devices not being
released when the domUs shutdown or migrate, so I decided to switch over to
tap:aio for my file-backed domUs. This isn't working, either. Whereas the
domUs with file: at least boot and run, the domUs with tap:aio: fail with this
error:
Hi Nick,
we're running quite some Xen machines on SLES 10 SP1 here, too.
I tried to switch from file:/ to tap:aio:/ (as xen documentation
recommends),
without success. As far as I can see the creation itself works, but it locks
down the machine shortly after accessing it.
For now I do my testing on Dom0 (it's easier to see what's happening there).
So here's what I tried:
# Create 2 TB sparse file
linux # dd if=/dev/zero of=/proj.stand/xen/disk2 bs=1M count=1 seek=2048000
1+0 records in
1+0 records out
1048576 bytes (1,0 MB) copied, 0,018314 seconds, 57,3 MB/s
# Attach it to dom0 as /dev/hdb
linux # xm block-attach 0 tap:aio:/proj.stand/xen/disk2 /dev/hdb w 0
linux # cat /proc/partitions
...
3 64 2097153024 hdb
...
Now fdisk/mount this device - whatever you like.
During my test the machine froze quite fast, however the same tests with
file:/
work quite well - no idea why.
Someone on the list, where this works?
Bye,
Marcel
Error: Device 51952 (vbd) could not be connected. Hotplug scripts not working.
I've searched the mailing lists and been through all the udev issues, and none of those seem to apply - my loop devices and vifs are connecting perfectly fine, just these tap:aio devices that won't work. I've also verified that blktap and xenblk are loaded as modules. I
used udevmonitor to track what happens when I start domUs with tap:aio vs. file (loop) disks. Here's file method:
UEVENT[1209507940.668013] add@/block/dm-30
UEVENT[1209507940.668040] offline@/block/dm-30
UEVENT[1209507940.668049] online@/block/dm-30
UEVENT[1209507940.668059] add@/block/dm-31
UEVENT[1209507940.668067] offline@/block/dm-31
UEVENT[1209507940.668074] online@/block/dm-31
UDEV [1209507940.895265] add@/block/dm-31
UDEV [1209507940.896125] offline@/block/dm-31
UDEV [1209507940.949818] online@/block/dm-31
UDEV [1209507940.951980] add@/block/dm-30
UDEV [1209507940.952814] offline@/block/dm-30
UEVENT[1209507940.962962] mount@/block/dm-30
UDEV [1209507940.979895] online@/block/dm-30
UDEV [1209507940.980777] mount@/block/dm-30
UEVENT[1209507941.415122] umount@/block/dm-30
UDEV [1209507941.415413] umount@/block/dm-30
UEVENT[1209507941.421063] remove@/block/dm-30
UEVENT[1209507941.422222] remove@/block/dm-31
UDEV [1209507941.422598] remove@/block/dm-30
UDEV [1209507941.423304] remove@/block/dm-31
UEVENT[1209507942.248473] add@/devices/xen-backend/vkbd-15-0
UDEV [1209507942.248767] add@/devices/xen-backend/vkbd-15-0
UEVENT[1209507942.255938] add@/devices/xen-backend/vfb-15-0
UDEV [1209507942.256133] add@/devices/xen-backend/vfb-15-0
UEVENT[1209507942.272675] add@/devices/xen-backend/vbd-15-51712
UEVENT[1209507942.297785] add@/devices/xen-backend/vif-15-0
UDEV [1209507942.298036] add@/devices/xen-backend/vif-15-0
UEVENT[1209507942.301038] add@/class/net/vif15.0
UEVENT[1209507942.301052] online@/devices/xen-backend/vif-15-0
UEVENT[1209507942.374108] add@/devices/xen-backend/console-15-0
UDEV [1209507942.374558] add@/devices/xen-backend/console-15-0
UDEV [1209507942.404498] online@/devices/xen-backend/vif-15-0
UDEV [1209507942.459501] add@/class/net/vif15.0
UDEV [1209507942.616792] add@/devices/xen-backend/vbd-15-51712
and here's tap:aio method:
UEVENT[1209507805.006622] add@/devices/xen-backend/vbd-0-51952
UEVENT[1209507805.007163] add@/devices/xen/vbd-51952
UDEV [1209507805.007937] add@/devices/xen/vbd-51952
UDEV [1209507805.042766] add@/devices/xen-backend/vbd-0-51952
UEVENT[1209507905.016513] remove@/devices/xen-backend/vbd-0-51952
UEVENT[1209507905.067583] remove@/devices/xen/vbd-51952
UDEV [1209507905.067852] remove@/devices/xen/vbd-51952
UDEV [1209507905.078662] remove@/devices/xen-backend/vbd-0-51952
syslog messages are unhelpful - here's the output when I try with tap:aio:
Apr 29 16:55:02 xen02 kernel: blkback: ring-ref 8, event-channel 38, protocol 1
(x86_64-abi)
Apr 29 16:55:02 xen02 kernel: blkback: ring-ref 8, event-channel 38, protocol 1
(x86_64-abi)
Apr 29 16:55:02 xen02 logger: /etc/xen/scripts/block: add
XENBUS_PATH=backend/vbd/0/51952
Apr 29 16:56:42 xen02 logger: /etc/xen/scripts/block: remove
XENBUS_PATH=backend/vbd/0/51952
Apr 29 16:56:43 xen02 logger: /etc/xen/scripts/xen-hotplug-cleanup:
XENBUS_PATH=backend/vbd/0/51952
Anyone have any hints as to what might be going on here? Any possible solutions?
Thanks,
Nick
P.S. - FWIW, it doesn't seem to make a difference whether the files are local vs. SAN as to whether tap:aio works or not.
This e-mail may contain confidential and privileged material for the sole use
of the intended recipient. If this email is not intended for you, or you are
not responsible for the delivery of this message to the intended recipient,
please note that this message may contain SEAKR Engineering (SEAKR)
Privileged/Proprietary Information. In such a case, you are strictly
prohibited from downloading, photocopying, distributing or otherwise using this
message, its contents or attachments in any way. If you have received this
message in error, please notify us immediately by replying to this e-mail and
delete the message from your mailbox. Information contained in this message
that does not relate to the business of SEAKR is neither endorsed by nor
attributable to SEAKR.
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
| 
Home