I thought I had written about this once before, but when I searched the site to find the solution I had come across before, I couldn’t find my post…. so, sorry if this is a duplication, but I’ve run into this on some AMD 64-bit based system boards. The most recent was based on the nvidia nforce4 chipset. Essentially in booting from either the alternative install cd or livecd for Ubuntu/kubuntu/edubuntu/xubuntu…. there is a freeze in the boot process. It goes for 30 seconds or more looking as though it’s hard frozen, but it does eventually manage to load the installer.
Category: Hardware
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iScsi and AoE with linux
A few days ago I had reason to investigate iscsi and AoE (ata over ethernet). Both are protocols for sharing a physical drive over the network at the block level. Let me put it in context first. Traditional network file shares have been done like this…. Computer A has a large drive, it’s formatted and available to Computer A and then THAT computer shares it out to computers B-zzzzzzz. iscsi and AoE basically share the bare drive and then computer B can attach to the drive format and make use of it as it’s own. Realistically I see the greatest advantage with this is adding storage to a server.
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Mac/Linux/Windows usb wireless adapter D-link DWL-G122
One of the tools I looked at having for my expanding kit has been a usb wireless adapter that would work with minimal install on Windows/Mac or Linux. As you can imagine…. it’s not as straightforward as just getting one that’s compatible with Windows…. well, after much searching I found the D-Link DWL-G122 802.11g Wireless USB adapter…. (Revision B it seems is the one to get…) Anyway, using a generic driver downloadable for the Mac it will work (from ralink http://www.ralinktech.com). On linux, you have choices (isn’t that the truth…) anyway, there is a native driver (from ralink for the RT2571W/RT2671 chipset) and there’s the rt2x00 driver project and it’s also possible (and fairly easy) to install the Windows driver via ndiswrapper.
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Linux software raid notes
Here are a few other notes on linux software raid. I created a directory called raidinfo to keep information in to make it easy to maintain the raid array. First… from the software raid howto, I’ve done the following….
sfdisk -d /dev/hda > /raidinfo/partitions.hda
sfdisk -d /dev/hde > /raidinfo/partitions.hdeSo…. I’ve now got a good snapshot of the partitioning data. When I hooked up an external usb drive to add to the array, all I needed to do is this…
sfdisk /dev/sda < /raidinfo/partitions.hda (more…)
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Live filesystem “capture” into a virtual disk image
ah… the joys of *nix utilities…. I’ve just successfully tested a “capture” of a live, running system into a virtual disk image. No, I don’t mean that I booted up with an imaging utility. I took a live, booted and logged in system and imaged the primary hard drive that it was living on, into a file on another machine. (Yeah, I know, there are probably a few people reading this and saying they’ve done that and most people that would need to do this already know how…. sorry I missed the memo.) Not too long ago, VMWare released a tool to do something like this (that tool is for windows…) This should work on any platform that supports dd and netcat (although I’m not sure if piping output from one program to another works with a dos command shell – maybe cygwin would be a good environment to accomplish this with.) Anyway… here are the details.
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Firewire/USB card and ethernet incompatibilities on Ubuntu 6.06
I’ve had a machine for quite a while that I’ve been working on as a “backup server”. My goal with it is to have a RAID1 setup with two 250GB drives and I also wanted USB2/firewire functionality so that I could even add a USB drive to the array for the purpose of having a hot-swapped spare drive that could be taken offsite. Well, the biggest frustration I’ve had has not been with software raid, or any of the rest of the software setup, but that something about the firewire/usb card didn’t like the built in ethernet. I FINALLY got things working… let me document what I went through.
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Scanning over the network, or sharing a scanner on a network
I remember the question from long ago, we had just shared a printer across a windows network and…. wait for it…. “oh, well could I share my scanner too?” On windows the typical answer was NO, at least not unless there was a driver from the scanner manufacturer that supported it, but on linux the answer is an unqualified YES as long as the scanner is supported under linux (so many are..) Using SANE (which is the linux scanner driver backend) you can share out scanners across a network and tips.linux.com has an article on just that topic. I’ve set it up before on my network and it was relatively easy to do and VERY convenient. At that time, I don’t recall a good functional windows client for the SANE driver, but it may have matured a bit by now (last I looked into it was 3-4 years ago.)
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Zoom H4 first look…
If you’re interested I’ve got a “first impressions” look at the Zoom H4 over on the ashevillemusiclessons.com site. I couldn’t decide where it would be more appropriate to post…..
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fdisk Unable to read /dev/sda
The other day I was trying to partition a drive hooked up via usb. (So it get’s /dev/sda as it’s device in linux)… I tried a few utilities to access the partition table and all failed, finally, I resorted to fdisk /dev/sda and was told “unable to read /dev/sda” which I thought was peculiar. The drive had come back in a “warranty replacement” swap for another drive and should have been wiped clean and should have been good as well.
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More linux software raid fun
OK, I know there are probably quite a few looking at this thinking…. “Hello where has he been?” when I’m talking about playing around with software raid under ubuntu linux, but…. in spite of all I’ve done supporting desktop systems and even small business servers I’ve never had an opportunity to setup a raid array. First it was because “you don’t want to do software raid” and I didn’t have a card to support hardware raid, then when I first was seeing people raving about how good linux software raid is, I didn’t have two free drives of equal size to work with. Well, the other day in working towards a storage system for a client I’ve got an ubuntu system (dapper 6.06.1) setup with software raid and wanted to poke and prod and test some things out before it goes into a useful role.