TheGrebs.com:IRC Logs:#xen:2005:05:14

---	Log	opened Sat May 14 00:00:57 2005
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02:15	Squink	anyone got any ideas on how I'd check the amount of diskspace i have in xenU ?
02:15	Squink	because it's saying i'm all out, although i've not used more than say, 1.5 gig
02:15	Squink	(on an 80 gig disk)
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02:57	Squink	nm, figured it out ;)
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07:18	grifferz	I don't suppose it is possible to export another block device to a domU without restarting the domU is it?
08:28	tessier	Squink: df command?
08:41	knewt	grifferz: xm vbd-create
08:42	knewt	can't remember if it works currently with a 2.6 guest though, so you'd have to try it out
08:42	grifferz	ok thanks
09:20	tessier	What should I set mem= on my dom0 to? My machine has 512M of RAM but I doubt that is the value I want to put there.
09:20	tessier	I would hate to leave even a single kilobyte unused.
09:27	tessier	And anyone know what's up with the mailing list? I have tried twice to subscribe but it says the list subscription is moderated and apparently my subscription never gets approved.
09:31	knewt	not sure. i just subscribed a test address temporarily and it worked fine. admittedly i did it direct via email, bypassing the web form, but it should work fine either way
09:32	tessier	ah...maybe the web form is broken somehow. I will try the direct address.
09:32	knewt	which list was it you were trying? xen-announce, xen-users, xen-devel or xen-changelog
09:33	knewt	you know the lists aren't on sourceforge any more of course?
09:33	tessier	The first three.
09:34	knewt	to subscribe easily via email, just send a blank email to xen-[whatever]-subscribe@lists.xensource.com
09:34	knewt	no subject or body required
09:34	knewt	i prefer using email, as even if the web form is of the older variety requiring you to supply a password, subscribing via email will generate a random password for you
09:42	tessier	I tried signing up onthe web again, no emails back. I just sent emails to the subscribe addresses.
09:44	knewt	if your own email server is fast, you should get back a reply within a few seconds
09:55	tessier	It is quite fast.
09:55	tessier	Still no emails. :(
09:56	tessier	Just checked the junkmail folder. Not there either.
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11:26	yarihm	esser sii
11:27	yarihm	grml ... hi everyone :)
11:33	tessier	Hi :)
11:44	tessier	What does VBD stand for?
11:44	knewt	virtual block device
11:44	tessier	ah
11:45	tessier	Does the vbd actually get mounted by domain0?
11:45	tessier	And then mounted again somehow but the domain that will really use it?
11:45	tessier	Just reading the wiki...it's not clear
11:45	tessier	oh, nevermind
11:45	tessier	This is iscsi
11:45	tessier	Domain Us iSCSI root
11:45	tessier	*
11:45	tessier	direct - need to try this.
11:45	tessier	*
11:45	tessier	mounted by domain 0, exported as VBD
11:46	tessier	So by "mounted" they don't really mean mounted as an fs I think.
11:46	knewt	it doesn't get "mounted", as you don't mount block devices, you mount file systems. it gets "opened", just like you would if you accessed a block device using something like dd
11:46	tessier	Just seen by iscsi in domain0 and made a block device which is then made a vbd to the other domain
11:46	tessier	ah, I see
11:47	Tv	tessier: yeah, the wiki says "mounted" when it means "is a block device"
11:47	Tv	I think I'll try to fix that right now
11:47	tessier	Another question: How do I know how big to set mem= to? My machine has 512M of RAM but I have a feeling I don't want to tell xen I have exactly 512 because somewhat less than that is likely to be usable by it.
11:47	Tv	if the wiki search would tell me what page said that :(
11:47		* tessier is quite interested in building a xen cluster with some sort of networked disk backing
11:48	tessier	I'll get you the url..
11:48	Tv	silly thing, enter searches titles only
11:48	tessier	http://wiki.xensource.com/xenwiki/XenStorage#head-815bd5c2badd35a80c2458983738993a856d2db7
11:48	Tv	found it
11:48	Tv	bah, "Immutable Page"
11:48	Tv	nice _wiki_
11:48	knewt	Tv: are you logged in?
11:48	Tv	no
11:48	knewt	you need to be logged in to edit the wiki pages
11:49	Tv	I don't need Yet Another crappy userid I do nothing with.
11:49	tessier	heh
11:50	Tv	well, fix that to say s/mounted by domain 0/iscsi drivers in dom0 provide block a device/
11:50	tessier	Unfortunately wiki spammers have made it a requirement to have logins for wikis
11:50	Tv	no
11:50	Tv	logins are required by bad design
11:50	Tv	human-only challenges can be one-time
11:51	knewt	the problem is that a lot of wiki spammers /are/ human
11:52	Tv	huh?
11:52	Tv	"wiki spam" commonly means bot-added links to porn/viagra/etc websites
11:52	knewt	a lot of the spam on wikis isn't added by spam software, there are actually lots of people out there manually entering spam into wikis
11:52	tessier	In addition to what is a valid argument to mem= I am wondering if memory can be "oversubscribed" since a lot of my domains won't be active for very but do need to be running for when a packet does come in.
11:52	Tv	well, they can register accounts too
11:53	tessier	Especially for a lot of my development environments etc.
11:53	Tv	tessier: you can't really oversubscribe well enough (yet), though ballooning may help a bit
11:53	Tv	tessier: provide swap to domUs
11:53	tessier	Tv: But it should be theoretically possible in the future?
11:54	Tv	tessier: it's possible even now (1GB RAM, start 512MB domU, balloon to 128MB, repeat)
11:54	knewt	tessier: are you running -unstable?
11:54	tessier	Tv: Yes, I could do that. They won't be as fast as they would be if I could oversubscribe RAM and let Xen do the swapping somehow though.
11:54	tessier	knewt: Runing stable.
11:54	Tv	tessier: it's just that they need the full 512MB when they start
11:54	Tv	tessier: swapping is swapping, why would there really be a speed difference?
11:55	knewt	tessier: mem isn't an option in -stable xen, it was only just added to -unstable. there's dom0_mem - is that what you mean?
11:56	tessier	I mean if I make a domain with 128M and then give it 128M swap so it can run its apps it will always be swapping a lot. Whereas if I could create a domain with 256M of RAM and oversubscribe the RAM the domain I happen to be using at the moment could fit everything into RAM and some other domain might get swapped out.
11:56	Tv	tessier: the point where that falls apart is this:
11:56	Tv	tessier: linux sees it has 256MB of RAM and decides to use 160MB as disk cache
11:56	knewt	you can move memory between domains, so you /can/ oversubscribe, but at a single point in time you can't have more memory actually given to each domain than really exists
11:57	Tv	tessier: xen swap trashes badly
11:57	tessier	knewt: I am running xen-2.0.5
11:57	tessier	knewt: Bummer. That means the domains I am not currently using will suck up valuable ram. Oh well. RAM is cheap.
11:57	knewt	it's possible to have a process in dom0 that dynamically moves memory about depending on need, but it doesn't exist currently
11:57	Tv	tessier: balloon them down
11:57	tessier	"sparse" RAM might be kinda cool.
11:58	Tv	tessier: when you really need them, balloon them up
11:58	tessier	Tv: And then balloon them back up again when I need them?
11:58	tessier	I see. I guess that will work.
11:58	tessier	I am running 2.0.5 and need to provide both dom0_mem to set the size of dom0 and also a mem= option to set the max size.
11:58	knewt	if you don't actually need them, why not just suspend them?
11:59	tessier	It would be nice to be able to just ssh to them and have them ready intead of having to go start them.
12:00		* Tv . o O ( an app in dom0 could do automagic resume when it sees network traffic to a domain.. )
12:00	Tv	like wake-on-lan on drugs :)
12:00	tessier	heh
12:02	tessier	I guess I'll try setting mem=512M and see what happens.
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13:37		* tessier wonders why his balloon command is having no effect
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15:06	tessier	lilo!
15:06	tessier	lilo: Ever get your asterisk system working?
15:07		* tessier notices the xen binary distribution kernel cannot open his crypto-loopback filesystem :(
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21:20	soffi	hey rusty man
21:20	rusty	Hello!
21:21	soffi	wassap
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22:27	rusty	Not much. Xen Store works
22:27	soffi	wtf is thast
22:27	soffi	that
22:28	riel	rusty: awesome!
22:30	rusty	riel: now, it just needs to be used (oh, and the small detail of what it actually should be used for)
22:30	soffi	Store with a capital sounds like a brand name, I'm beginning to think it's something technical
22:31		* soffi shuts his mouth and reads xen-devel
22:37	rusty	soffi: Yes, Xen Store will sell you all your partitioning needs! This week, DomUs on special! IT'S CRAZY!
22:38	yosh	haha
22:38	yosh	Crazy Rusty's DomUs
22:39	soffi	rusty: cool, does it accept paypal?
22:39	soffi	heehe
22:39	soffi	just caught up on -devel,, I don't read -devel that much
22:40	soffi	mostly because if I were to participate in that list, all you would get would be nonsense one-liners
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23:14	grifferz	I started a domain with 128M memory a while ago. now I want to increase it to 256, but "xm balloon 2 256" just instamtly returns. at first I thought it would be the maxmem, but after doing "xm maxmem 2 256" and then repeating the balloon, it still does the same. is this known?
23:15	grifferz	ah wait, does my domain itself have to ask to grow larger too?
23:15	grifferz	I do not have the same files in /proc/xen as described in the documentation. I just have /proc/xen/balloon
23:18	grifferz	ooh. "echo 262144 > /proc/xen/balloon" just made very bad things happen
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---	Log	closed Sun May 15 00:00:48 2005