search for: tapdisk2

Have an interesting one here, originally found on xen 4.1.0 but just upgraded to xen 4.1.1 and it''s still here. Creating a VM with a tap2 device pointed at /dev/mapper/something, when that device doesn''t exist, causes the tapdisk2 process to go into D mode and also manages to take out any process that queries it. For example, I have /dev/mapper/nathanxenuk1 as a valid disk and /dev/mapper/test which doesn''t exist. Creating using libvirt: <opt type="xen"> <name>nathanxenuk1</name> <...

Hi all, Suppose tapdisk2(a) serves Dom1, tapdisk2(b) serves Dom2, when both Dom1 and Dom2 are issuing random write requests, is it possible for tapdisk2(a) to dispatch requests both from Dom1 and Dom2? I hope not, but when I trace the I/O in Dom0, I notice that tapdisk2(a) dispatches requests from both guest domains. Is it...

Hi all, as promised I run some simple benchmarks using tapdisk2 and the new qemu as disk backends. If you are in a hurry skip to the last section to see the test results. SOFTWARE REQUIREMENTS --------------------- In order to reproduce these results you need to use the new qemu with linux aio and O_DIRECT as disk backend: - apply the libxl patches that Ant...

Hi there, I just found a segfaulting tapdisk2 process which led into a kernel oops. [1527071.169682] tapdisk2[26548]: segfault at 7fffd324cfe8 ip 000000000040837f sp 00007fffd324cff0 error 6 in tapdisk2[400000+38000] [1527071.220104] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048 [1527071.220170] IP: [<ffffffff...

...stderr: Check that target "/home/ashish/xen/hd.img" exists and that blktap2 driver installed in dom0. " Dom0 dmesg shows: " [ 7112.648271] blktap_sysfs_create: adding attributes for dev eb5506c0 [ 7112.648287] blktap_control_allocate_tap: allocated tap de87e000 [ 7112.651564] tapdisk2[7325]: segfault at 10 ip b763a540 sp bffd548c error 4 in libpthread-2.7.so[b7633000+14000] " tapdisk2 -n aio:/home/ashish/xen/hd.img output shows the same above segfault msg Any ideas what could be wrong? config, xmexample, and dmesg attached. Thanks, Ashish ___________________________...

...o tapdisk-log.o tapdisk-log.c cc1: warnings being treated as errors tapdisk-log.c: In function ‘tlog_flush’: tapdisk-log.c:250: error: ignoring return value of ‘write’, declared with attribute warn_unused_result ------ /root/Xen/xen-4.2-unstable/tools/blktap2/drivers/../../../tools/libaio/src -c -o tapdisk2.o tapdisk2.c cc1: warnings being treated as errors tapdisk2.c: In function ‘main’: tapdisk2.c:82: error: ignoring return value of ‘chdir’, declared with attribute warn_unused_result ------ cc1: warnings being treated as errors tapdisk-stream.c: In function ‘tapdisk_stream_poll_clear’: tapdisk-strea...

...ng seems to run fine, except that I am trying since a few hours to mount a .vhd file in the dom0. What I tried so far: to create a blank vhd file (this is working): host# vhd-util create -n /storage/test.vhd -s 20G Then i try to mount the file in dom0 (as stated in a blktap2 README file) host# tapdisk2 -n vhc:/storage/test.vhd it fails, returning: tapdisk2: invalid option -- ''n'' usage: tapdisk2 <-u uuid> <-c control socket> Then i''ve tried: host# tap-ctl list It returns: blktap kernel module not installed Then tried too: host# xl block-attach 0 tap:vhd:...

I have a problem that tap:tapdisk:vhd:... is never actually plugged in. What can be the reason of such a thing happening? John _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

...induced failure in properly freeing a blktap2 device. We ported the blktap2 driver from Dan Stodden''s GIT tree into 3.2.x which is a reasonably straight forward process. We are also running the toolchain with a patch which Ian Campbell posted in order to get xl to properly terminate the tapdisk2 driver process which is spawned for a block device. With that patch applied we''ve isolated a problem which prevents the tapdev minor from being released. We tracked the problem down to what appears to be a livelock related to the unmapping of the ring memory by the tapdisk2 process. Mos...

...= -lrt -lz - -LBLIBS_img := $(LDLIBS_libxenctrl) $(CRYPT_LIB) -lpthread -lz -lm - -LIBS += -L$(LIBVHDDIR) -lvhd +VHDLIBS := -L$(LIBVHDDIR) -lvhd REMUS-OBJS := block-remus.o REMUS-OBJS += hashtable.o @@ -88,26 +84,26 @@ all: $(IBIN) lock-util qcow-util all: $(IBIN) lock-util qcow-util -tapdisk2: $(TAP-OBJS-y) $(BLK-OBJS-y) $(MISC-OBJS-y) tapdisk2.c - $(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS) $(LIBS) $(AIOLIBS) $(MEMSHRLIBS) $(LBLIBS_img) +tapdisk2: $(TAP-OBJS-y) $(BLK-OBJS-y) $(MISC-OBJS-y) tapdisk2.o + $(CC) -o $@ $^ $(LDFLAGS) -lrt -lz $(VHDLIBS) $(AIOLIBS) $(MEMSHRLIBS) -lm tapdisk-clien...

Hi, Just wondering if anyone can point me to the new locations for xen/next-3.0 repo? git.kernel.org doesn''t appear to be coming back up (http://www.theregister.co.uk/2011/09/06/linus_torvalds_dumps_kernel_for_github/) and the XenParavirtOps wiki page still refers to that. Searching the list didn''t seem to come up with anything. Thanks, Nathan -- Nathan

Get blktap2 running on pvops. This mainly adds eventfd support to the userland code. Based on some prior cleanup to tapdisk-queue and the server object. We had most of that in XenServer for a while, so I kept it stacked. 1. Clean up IPC and AIO init in tapdisk-server. [I think tapdisk-ipc in blktap2 is basically obsolete. Pending a later patch to remove it?] 2. Split tapdisk-queue into

Hello, I have been playing around with Remus on Xen 4.0.1, attempting to fail-over for an HVM domU. I''ve run into some problems that I think could be related to tapdisk2 and its interaction with how one sets up Remus disk replication in the domU config file. A few things I''ve noticed: -The tap:remus:backupHostIP:port|aio:imagePath notation does not work for me, although this is what is written in the Remus documentation. However, I have found the follow...

...g a key into xenstore. Perhaps a udev rule problem? Perhaps someone who knows more about tapdisk than I well be able to diagnose this tomorrow. Mike Sent from Samsung tablet Sébastien RICCIO <sr@swisscenter.com> wrote: Of course, here it is attached. Last line seems interesting. However tapdisk2 is started and the device is attached to the dom0. As it''s a box for my experimentations I can give you shell access if you want to see things on the beast :) Sébastien On 07/20/2011 10:30 PM, Mike McClurg wrote: > Can you provide the tail of xensource.log? It''s usually /var...

...n sda11 to use as virtual machine's disks. o Create an ioband devices on sda11. o Create two virtual machines that using the prepared files as Xen virtual machine's disk. o Create two extra ioband-groups on ioband1, the first is of process tapdisk1 and the second is of process tapdisk2. o Run 128 processes issuing random read/write direct I/O with 4KB data on each virtual machine at the same time respectively. o Count up the number of I/Os which have done in 60 seconds. +--------------------------+ +--------------------------+ | Virtual Machine 1 | | V...

...n sda11 to use as virtual machine's disks. o Create an ioband devices on sda11. o Create two virtual machines that using the prepared files as Xen virtual machine's disk. o Create two extra ioband-groups on ioband1, the first is of process tapdisk1 and the second is of process tapdisk2. o Run 128 processes issuing random read/write direct I/O with 4KB data on each virtual machine at the same time respectively. o Count up the number of I/Os which have done in 60 seconds. +--------------------------+ +--------------------------+ | Virtual Machine 1 | | V...

...n sda11 to use as virtual machine's disks. o Create an ioband devices on sda11. o Create two virtual machines that using the prepared files as Xen virtual machine's disk. o Create two extra ioband-groups on ioband1, the first is of process tapdisk1 and the second is of process tapdisk2. o Run 128 processes issuing random read/write direct I/O with 4KB data on each virtual machine at the same time respectively. o Count up the number of I/Os which have done in 60 seconds. +--------------------------+ +--------------------------+ | Virtual Machine 1 | | V...

...(DevController:628) hotplugStatusCallback /local/domain/0/backend/vif/26/0/hotplug-status. [2010-06-25 03:13:36 4401] INFO (SrvDaemon:332) Xend Daemon started [2010-06-25 03:13:36 4401] INFO (SrvDaemon:336) Xend changeset: unavailable. ... ... /var/log/messages: ... ... Jun 25 03:10:41 r21b02004 tapdisk2[16340]: /guest/VM-420A07DA/disk10369/image.vhd: 4 Jun 25 03:10:41 r21b02004 kernel: blktap_ring_open: opening device blktap3 Jun 25 03:10:41 r21b02004 kernel: blktap_ring_open: opened device 3 Jun 25 03:10:41 r21b02004 kernel: blktap_ring_mmap: blktap: mapping pid is 16340 Jun 25 03:10:41 r21b02004...

...(DevController:628) hotplugStatusCallback /local/domain/0/backend/vif/26/0/hotplug-status. [2010-06-25 03:13:36 4401] INFO (SrvDaemon:332) Xend Daemon started [2010-06-25 03:13:36 4401] INFO (SrvDaemon:336) Xend changeset: unavailable. ... ... /var/log/messages: ... ... Jun 25 03:10:41 r21b02004 tapdisk2[16340]: /guest/VM-420A07DA/disk10369/image.vhd: 4 Jun 25 03:10:41 r21b02004 kernel: blktap_ring_open: opening device blktap3 Jun 25 03:10:41 r21b02004 kernel: blktap_ring_open: opened device 3 Jun 25 03:10:41 r21b02004 kernel: blktap_ring_mmap: blktap: mapping pid is 16340 Jun 25 03:10:41 r21b02004...

Hi, Ooops, mistake, please read host# tapdisk2 -n vhd:/storage/test.vhd instead of host# tapdisk2 -n vhc:/storage/test.vhd in my previous post. Kind regards, Sébastien _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel