TheGrebs.com:IRC Logs:#xen:2006:03:11

---	Log	opened Sat Mar 11 00:00:09 2006
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07:49	<Trnc>	hello there
07:50	<Trnc>	anyone arround?
07:50	<Trnc>	I could use some help with xen
07:51	<Trnc>	I'm using Fedora Core 4
07:51	<Trnc>	while trying to create a vm I've been getting an error with vbd
07:52	<Trnc>	and then it says backend error
07:52	<Trnc>	ideas?
07:52	<Trnc>	please :(
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08:31	<hikenboot>	Trnc are you booted into your xen kernel uname -r
08:32	<hikenboot>	is xend started /usr/sbin/xend start
08:33	<hikenboot>	anyone know what this error is
08:33	<hikenboot>	Error: Received invalid response from Xend, twice
08:33	<hikenboot>	when starting domU
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08:48	<hikenboot>	anyone know how to get debug info out of xm?
08:58	<iamlost>	it looks like making nvidia xen aware should be possible
08:58	<iamlost>	seems to call open source functions in order to access direct memory for e.g. AGP DMA etc
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18:53	<michal`>	ok
18:53	<michal`>	tell me guys
18:53	<michal`>	i have domU booting with loop backed root device
18:53	<michal`>	but it does not want to with lvm backed root device
18:54	<michal`>	vfs: unable to open root device sda1 or unknown block(0,0)
18:54	<michal`>	this (0,0) looks suspicious to me
18:57	<riel>	sda1? xen 2.0 ?
18:57	<michal`>	xen 3
18:58	<michal`>	does not matter since it is not working with hda1 also
18:59	<itamarjp>	riel, are you there ?
19:01	<riel>	michal`: how about xvda ?
19:01	<riel>	michal`: what does the xen kernel say about the block devices at startup?
19:01	<riel>	itamarjp: yes
19:02	<michal`>	riel: you know what is interesting ?
19:02	<michal`>	that i have managed to boot loop backed root device and lvm backed swap
19:02	<michal`>	and it can see and use that lvm backed swap
19:02	<michal`>	now i wonder
19:02	<itamarjp>	riel: Can you help-me with this kernel-panic: swapper: page allocation failure. order:0, mode:0x20
19:03	<riel>	itamarjp: no
19:03	<michal`>	riel: when copying system from loop file mount point to lvm volume mount point i have used rsync -av /mnt /mnt2
19:04	<michal`>	could i broke that system this way ? i supose rsync is safe for it
19:04	<riel>	michal`: no
19:04	<riel>	michal`: but you may have broken the configuration
19:04	<riel>	michal`: read the kernel messages at bootup of your guest, it will tell you what block devices it knows
19:04	<michal`>	but half loop half lvm boots :/
19:04	<michal`>	ok...
19:04	<riel>	itamarjp: you're just not being specific enough to help
19:05	<michal`>	xvda ? i do not know it
19:06	<michal`>	riel: it does not seem to find any block devices
19:07	<michal`>	and since i am using the same kernel for domU as with loop which boots i supose it to be working configuration
19:07	<riel>	michal`: you suppose wrong ;)
19:07	<riel>	michal`: just read it all, including the before-kernel messages from xend
19:08	<michal`>	nothing before from xen
19:08	<michal`>	wait, i'll pastebin it
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19:08	<riel>	every time you say "I assume this will work" you're probably assuming something too much
19:08	<michal`>	indeed ;)
19:08	<itamarjp>	riel, my dom0 is craching http://pastebin.ca/45286
19:09	<michal`>	riel: pastebin.com/597253
19:09	<itamarjp>	riel, I have increased values in /proc/sys/vm/min_free_kbytes and /proc/sys/vm/max_map_count, but I don´t know if it fix the problem
19:09	<michal`>	nothing interesting there for me ;)
19:10	<riel>	itamarjp: file a bug with whoever compiled your kernel package
19:11	<itamarjp>	riel: ok
19:11	<riel>	michal`: that probably means you didn't configure a block device for that virtual machine
19:11	<riel>	michal`: maybe a typo
19:11	<michal`>	i did - the same kernel boots with loop :)
19:11	<riel>	no errors in /var/log/xen* ?
19:12	<michal`>	nothing
19:12	<michal`>	pastebin.com/597257
19:12	<michal`>	my domU config
19:14	<itamarjp>	michal, remove , at the end of line 7
19:14	<riel>	itamarjp: nice catch
19:15	<michal`>	hm, thx for that
19:15	<michal`>	_but_
19:15	<michal`>	registering block devic major 8
19:15	<michal`>	great :)
19:15	<michal`>	vfs: unable to mount root fs on unknown-block (8,1)
19:16	<michal`>	there has to be something more than
19:16	<riel>	(8,1) is sda1
19:16	<riel>	IIRC
19:16	<michal`>	so good
19:17	<michal`>	CONFIG_BLK_DEV_SD=y
19:18	<michal`>	CONFIG_SCSI=y
19:18	<michal`>	in domU kernel
19:18	<michal`>	and again - when loop backed, there is no problem with opening sda1
19:21	<riel>	ummm, that has NOTHING to do with domU
19:21	<riel>	domU does not use scsi, unless it is iscsi
19:21	<riel>	CONFIG_XEN_BLKDEV_FRONTEND is what matters
19:22	<michal`>	1. it is there
19:22	<michal`>	2. if it would not loop would not boot anyway :)
19:25	<itamarjp>	michal, try using loop as sda1 and lvm as sdb1, and try to access sdb1 from domU
19:26	<michal`>	works
19:26	<michal`>	[02:02:31][02:02:31] < michal`> that i have managed to boot loop backed root device and lvm backed swap[02:02:39] < michal`> and it can see and use that lvm backed swap
19:27	<michal`>	switched to xvda btw
19:28	<michal`>	Adding 524280k swap on /dev/xvdb1. Priority:-2 extents:1 across:524280k
19:28	<michal`>	my lvm :)
19:28	<michal`>	loop on root
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19:36	<michal`>	riel: itamarjp
19:36	<michal`>	it is working now :)
19:37	<michal`>	i have changed fs along with backing device change, rebuild kernel to include it, _copied_ it in the right place but...
19:37	<michal`>	with U letter instead of u !
19:37	<michal`>	lol
19:37	<michal`>	lo l@ me
19:37	<michal`>	sorry for waisting your time :)
19:38	<michal`>	anyway, thx for help and for xvd tip :)
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23:59	\|-\|	riel [riel@fangorn.surriel.com] has quit [Ping timeout: 480 seconds]
---	Log	closed Sun Mar 12 00:00:23 2006