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USB3 disk problems
by James Harper 13 Mar '13

13 Mar '13

Our nightly backups outgrew the 500GB disks I was using so I've bought some 1TB disks, and they aren't working properly. Both the old and new disk are USB3 disks on a USB3 controller which seems to require a reboot every 50 plug/unplug cycles or so but otherwise previously worked well. The symptoms are: [ 7455.667194] sd 16:0:0:0: [sdj] Attached SCSI disk [ 7690.448638] EXT3-fs error (device sdd1): ext3_find_entry: reading directory #2 offset 0 [ 7690.448972] Buffer I/O error on device sdd1, logical block 0 [ 7690.448994] lost page write due to I/O error on sdd1 [ 7690.448999] EXT3-fs (sdd1): I/O error while writing superblock [ 7690.449056] EXT3-fs (sdd1): error: ext3_journal_start_sb: Detected aborted journal (the first message is an indication of when I plugged the disk in, the second is the start of it having errors) The disk itself seems okay and doesn't fail at a specific sector each time or anything, and I've tried another disk too. The USB3 cable is quite long, so I've replaced it with a shorter one and so far it's backed up 10GB since I started writing this email. On other tests it's written out around 200GB before failing. The possibilities I can think of are: . cable bad (it's well less than 3M) . usb disk incompatible with controller (USB3 controllers of that vintage are a bit hit and miss) . usb disk drawing too much power (shouldn't USB log an error about this? Are there tools to check?) . bad batch of drives (all pass smart tests) . something else Any thoughts? It's one of those problems that takes hours to test each troubleshooting step and meanwhile offsite backups are not getting done (20GB now and counting!) Thanks James

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wpa_supplicant must run twice
by Toby Corkindale 13 Mar '13

13 Mar '13

I spent ages last night getting wireless working on an embedded ARM device. The problem is that the first time wpa_supplicant runs, it can't see any SSIDs, and doesn't get anywhere. The second time it runs, it's all fine. My eventual solution was to create a script that runs wpa_supplicant, waits five seconds, kills it, then runs it again. So, so dirty. This issue only appears to occur with one of my three USB wifi adapters. However of the others, one isn't supported by any version of Linux, and the other one is dodgy on 3.2 kernels.. but post 3.2.x kernels don't work reliably on this hardware. Soo.. while I wait for a fourth bloody USB adapter with yet another wifi chipset in it to arrive.. does anyone have any ideas how to fix the current one? I'm guessing there's something specific the wifi adapter needs initialised before it will work, but I just don't know what.. Cheers, Toby

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LCD Display on Logitech Z-10 speakers
by Greg Bromage 13 Mar '13

13 Mar '13

Hi there! Does anyone have any experience (or example configs) on using/configuring the LCD screen and buttons on Logitech Z-10 speakers? The ultimate aim I'm after is to use them as the UI for a headless Raspberry Pi sound system. Thanks in advance, G.

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Re: USB3 disk problems
by zlinw＠mcmedia.com.au 12 Mar '13

12 Mar '13

Should not be to difficult to make a couple of adapters one to allow one to check cable resistance the second to allow one to use a multimeter to check the current drawn. It would very likely be possible to include both the functions in a single small adapter. Being able to measure what is going on gets around the problem of software telling one small white lies. In fact now that I think about it I have already made up the current measuring one. Lindsay

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Bar camp melbourne
by Bianca Gibson 11 Mar '13

11 Mar '13

Hi all, Bar camp Melbourne is back on, now down to one day on Saturday: http://barcampmel.org/ Cheers, Bianca

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in-house dynamic dns server
by James Harper 10 Mar '13

10 Mar '13

We have a few customers on dynamic IP addresses that we would like to be able to connect to remotely. If we lead the customer through the procedure to find their IP address and tell us then it all works fine but I'd like something a bit smoother. The customers in this case are charities and other very low budget organisations so even then extra $10/month for a static IP address isn't feasible. I have a bind9 server, can that make use of standard dyndns protocols somehow (even via a separate daemon)? Or anything option would be good too. I'm getting a lot of noise on google when I try and search. Thanks James

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3D printed gown and jewellery by Makerbot
by Les Kitchen 10 Mar '13

10 Mar '13

http://www.wired.com/design/2013/03/dita-von-teese-3-d-printed-gown/

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Curioser, changed files when put into ISO
by Mark Trickett 09 Mar '13

09 Mar '13

Hello All, I wanted to put some photos onto a CD, but have burnt what have turned out to be several coasters. The first signature of the files is no longer correct for JPEG's when using Brasereo on a reasonably current Debian install. I do have one disk that worked, not quite sure how. Of several ways, have opened Brasereo, and copy and paste into a new data project, then both burnt disk and the .ISO image mounted via loopback show the issue. With burning the disk, just putting in the blank disk (CD or DVD) opens the file manager in burning form, ready to do the paste. The machine is a stand alone PC, no net access, at least not routine. I can take with me when I visit a friend now and then who has ADSL, but not routine. Regards, Mark Trickett

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You can get my command-line tools from github
by Duncan Roe 09 Mar '13

09 Mar '13

For anyone who saw my lightning talk on these at LCA2013, they are now online at https://github.com/duncan-roe/command_line_tools.git If you didn't see the talk: this is a collection of tools I've used over the last 20 years. Most are for program development, with some for system administration. Enjoy, Cheers ... Duncan. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html

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3/7/2013 10:23:13 PM
by Chandra Amarasingham 07 Mar '13

07 Mar '13

http://www.reformasostenible.com/sksrm/rolehxaj/hkmeyjd/fgepuuudy/kui Chandra Amarasingham 3/7/2013 10:23:13 PM

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