IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 16 May 2010   (all times are UTC)

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01:58
<alkisg>
Wow, btrfs looks sweet for ltsp chroots... online volume growth and shrinking, transparent compression, copy on write, snapshots, subvolumes... if all this is true, we might be able to stop using squashfs, nbd, ltsp-update-image, bind mounts, aufs, tmpfs, different images/nbd ports (we'd use subvolumes) etc...
02:02
<dba>
btrfs doesn't compress nearly as good as squashfs, yet.
02:05
<alkisg>
squashfs compression in ubuntu lucid was completely disabled in ltsp because it caused problems... so I'm sure it can outperform 0% compression :D
02:06
But the main point it that it'll be a live file system, like nfs, not a "snapshot" like the nbd/squashfs combination
02:06
...and crfs on top of it to share it over the network: http://lwn.net/Articles/267896/
02:07
"The basic idea behind CRFS is to have clients cache as much of the filesystem data as they can while using cache coherency protocols to reduce the amount of network traffic that gets generated. " ==> that's just perfect for local networks
02:11
"Something on the order of a 3x speedup over asynchronous NFS mounts is the current performance of CRFS for a simple untar. Comparing to synchronous NFS mounts (where each write has to actually hit the remote disk) is not a sensible comparison; there is a roughly 10x speed difference between the two types of NFS mounts."
02:23
<dba>
i'm not argueing against btrfs, i'm quite fond of it anyway
02:24
i'm just saying until it's a full replacement for the current aufs+squashfs stack,
02:25
will need some more time (in order of magnitude of many months).
02:30
<alkisg>
Sure - I was thinking for the next lts ubuntu release in 2 years...
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06:00
<langvann_>
ok
06:00
so spotify works over ltsp
06:00
but how do I gain root?
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11:01
<alkisg>
!button_layout
11:01
<ltspbot>
alkisg: "button_layout" :: To revert the Ubuntu button position and ordering to their old values, run: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /apps/metacity/general/button_layout :minimize,maximize,close
11:01
<alkisg>
!forget button_layout
11:01
<ltspbot>
alkisg: The operation succeeded.
11:02
<alkisg>
!learn button_layout as To revert the Ubuntu button position and ordering to their old values, run: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /apps/metacity/general/button_layout menu:minimize,maximize,close
11:02
<ltspbot>
alkisg: The operation succeeded.
11:02
<alkisg>
!button_layout
11:02
<ltspbot>
alkisg: "button_layout" :: To revert the Ubuntu button position and ordering to their old values, run: sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /apps/metacity/general/button_layout menu:minimize,maximize,close
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12:21
<rhodan>
can I use existing user homes on an active directory server for user homes on linux machines?
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13:03
<johnny>
hmm.. i need a cd that can boot usb live images
13:04
<stgraber>
alkisg: we are syncing from unstable for maverick, syncing from testing is only for lts
13:04
<johnny>
or anything ese really
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13:08
<alkisg>
stgraber: nice! Any idea when udhcp will be syncing from debian?
13:08
johnny: you want to boot a client from usb but its bios doesn't support it?
13:10
<johnny>
yes
13:10
i've been carrying around a slightly chunky cd folder with various install cds and some 2 blank cdrs, 2 blank dvds, and a cdrw
13:11
i'd like to replace it with 3 cds
13:11
1 cd that can boot anything from a usb key
13:11
1 blank cdr, and 1 blank dvd
13:12
i wonder how long cdrw's last in all reality.. i think i should use that
13:12
<alkisg>
If the bios doesn't "see" the usb port, then you need to boot a kernel to see the port
13:12
<johnny>
hmm..
13:12
<alkisg>
I.e. grub/syslinux can't boot from usb if the bios doesn't support it
13:12
<johnny>
what computers are those?
13:12
oh.. see the port ? or see the port as bootable?
13:13
<alkisg>
See the port
13:13
(as a storage device)
13:13
<johnny>
hmm.. how old are we talkin about?
13:13
<alkisg>
2004 I think
13:14
Try it, put an ubuntu cd in it and write "chain32 hd0 1"
13:14
...or the grub2 rescue cd..
13:15
<johnny>
i don't have such a pc available
13:16
i do have a pc that boots only in usb floppy mode
13:16
which is lame
13:16
but the mobo got shot
13:16
i think the powersupply took it out
13:16
<alkisg>
Yeah grub2 or syslinux will be able to boot that properly (in hard disk mode)
13:16
*would
13:17
<johnny>
hmm.. it says that grub2 can boot usb from pcs that can't normally boot usb
13:18
"GRUB2 can boot a USB in a computer that can't normally boot a USB drive"
13:18
<alkisg>
Well there are 3 cases
13:18
<Mava>
hmm.. ?
13:18
johnny: where does that read? wanna take a look at it also
13:18
<alkisg>
1) The bios doesn't see it, grub doesn't see it, you need to load a kernel first to see the usb stick
13:19
2) The bios sees it but doesn't boot from it. Yeah in that case grub can boot from it
13:19
3) The bios supports booting from usb, so grub isn't needed
13:19
<johnny>
so.. what's the age range between those 2?
13:19
<alkisg>
I think about 2003-2005
13:19
or something like that
13:20
My daugter's laptop is like that, when its hard disk broke I had to write a kernel to a cd to boot it from an external disk
13:20
<johnny>
http://members.iinet.net/~herman546/p20.html
13:21
hmm.. that sucks..
13:21
i'm really not sure i are perhaps tho
13:21
maybe i should just not carry around disks at all except the blanks then
13:22
<alkisg>
A multiboot cd (grub2, syslinux, gpxe, live cd) is nice to have around
13:26
<Mava>
pxe boot ?
13:27
<johnny>
sure..
13:27
grub can pxe boot
13:28
alkisg, not sure how useful it will be .. might as well just hope that sysreccd or similiar gets grub2 then
13:28
sysreccd is a bit too disk focused tho. looking for something a little larger
13:35
<alkisg>
johnny: grub2 doesn't have any advantage over syslinux for booting from usb...
13:36
<johnny>
except that it can boot more things
13:37
<alkisg>
Yup... I thought you were talking about usb, that's why I was referring to it - (09:03:20 μμ) johnny: hmm.. i need a cd that can boot usb live images
13:38
<johnny>
sure, it just seems convenient to use grub
13:38
since you can more easily set the targets
13:45
<alkisg>
Yeah I'm a grub2 fan too - I especially like grub-mkimage, it allows for creating triple boot images (floppy/usb/cd) and it also enables the user to add custom files to those images (e.g. gpxe)...
13:46
<johnny>
has anybody done a "distro" of such a thing?
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13:53
<johnny>
i'd love to pack a usb key with a bunch of isos
13:53
and have it automatically update them
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