Easterhegg 2008 — Follow the white rabbit

I’m heading for easterhegg this friday, Topina, Bugblue and Tla will also be going there. It’s in Cologne, Germany so it’s only just across the border. Don’t expect me to give any coherant answers to questions untill at least tuesday 🙂

Update 21/03: Ok… I arrived at EH2008, met Bug, Topina and Tla and some other people from previous con’s. The wifi is up, I checked into my hotel, which was pretty decent for the price, and I saw a bit of the city while walking along the Rhine. Haven’t seen any lectures or workshops yet, but I don’t expect I’ll see that many anyway.

More later… maybe

LinuxTAG day 3 — LVM2 Insiders

Insiders guide to Linux LVM2 – Alasdair Kergon – Redhat – 2006/05/05

Advantages of LVM
– Filesystems can extend across disks
– Data can be moved to other disks while in use
– Snapshots
– Hardware config hidden from software

Device Mapper
– Generic kernel framework for volume management
– Modular framework for block devices that map I/O to/from
existing devices based on a table of rules
– Written as a replacement for in-kernel LVM code
– Included in 2.6 kernel

EVMS -> Directly to devmapper
LVM2 -> talk to libdevmapper which talks to devmapper

Snapshots
– Writable snapshots implementation
– Copy-on-write
– Run fsck on a snapshot to find out if a fsck is required on the
real data/disks

Tools
– dmsetup
– LVM2
– EVMS
– cryptsetup
– dmraid
– multipath tools

Metadata
A PV is an ordered list of raw device segments
A VG consists of unordered lists of PV’s and LV’s
A LV is an ordered list of LV segments
A LV-Segment is a mapping applied to an ordered list of
PV-segments or LV segments

Label – one sector near the start of the PV
– Header – Points to label data
– Data – Points to metadata areas and data areas

For larger installations, increate metadata size in PV (default is fine for home-use, not production)

LMV2 tools
– Single binary (argv[0] )
– Unified cmdline processing
– Supports metadata formats via loadable modules (lvm1, lvm2, gfs)
– Customizable logging
– much more
– pvs, lvs, vgs -> replacements for displayvg, displaylv etc…
– put tags on lv, pv or vg, and specify groups by a tag

DevMapper Roadmap
– Minimime lock times
– Allow some ioctl’s to non-root users
– Netlink interface

LinuxTAG.de — day 1

So after a last minute party (sim, grats with the new job) last night (and mono and tara are nice pubs) and therefore a really really late night, I got up somewhat early this morning (but not as early as originally planned) and packed for LinuxTAG  in Wiesbaden, Germany . At around 8:00 I was ready to leave home. I arrived in Wiesbaden and entered the conference building (Rhein-Main-Hallen) around 12:30, which gave me more then enough time to register, look around a bit and attend the first lecture (Kismet and GPSDrive) at 13:00.

After the kismet lecture I went for a talk with the OpenBSD and LPI guys and then decided to check the wifi-connection. Everything seems to work, though I am missing some routes towards my home-box. Today aren’t too many interesting (and english) lectures, so maybe I’ll go check out the city somewhat… From what I’ve seen it’s beatiful, and I’m dead-smack in the city-center (parking hell). The train-station here is breathtaking. I’ll be heading over to N’s place later this evening to crash there… thanx N.

Fosdem

So, I arrived in Brussels yesterday morning to attend FOSDEM. There were some interesting lectures, and I spent quite some time hacking on proxytunnel, since there was no internet connectivity. This morning I finally got a half-decent wifi-connection that actually routes packets so I could finally update the cvs-tree and read up on my mail and weblog 🙂

I tried looking for a club or something yesterday evening, because the hotel sucks and there is really nothing to do in the evenings at fosdem. I spent about 2-3 hours walking around the center of brussels, looking for somewhere nice, but I didn’t manage to find anything. Then I needed to find my car again which took quite some time (walking in completely the wrong direction…). Brussels is really hell on directions and traffic… I’m lucky to have a nav-system in my pocket, or I would never find my way here.

Today is the last day of fosdem, so a few more lectures and then it’s time to get something to eat and head back north 😉