Roundtable March 2013

roundtable@muug.ca

18 participants
16 discussions

Re: [RndTbl] can't stop md yet lsof is empty?
by Adam Thompson 17 Mar '13

17 Mar '13

Stale NFS handles? Try lsof|grep MD instead? Trevor Cordes <trevor(a)tecnopolis.ca> wrote: >Very weird problem here: > >I umounted the filesystem on a md (RAID1) device. > >Then: > >mdadm --stop /dev/md1 >mdadm: Cannot get exclusive access to /dev/md1:Perhaps a running process, >mounted filesystem or active volume group? > >Huh? > >lsof /dev/md1 ><nothing!> > >I remounted the fs and tried lsof <fs> and it was empty too. > >I can't seem to find any reason why mdadm --stop should not allow stopping >this array. Any ideas? Anything other than lsof that can help find out >why? >_______________________________________________ >Roundtable mailing list >Roundtable(a)muug.mb.ca >http://www.muug.mb.ca/mailman/listinfo/roundtable

2 1

can't stop md yet lsof is empty?
by Trevor Cordes 16 Mar '13

16 Mar '13

Very weird problem here: I umounted the filesystem on a md (RAID1) device. Then: mdadm --stop /dev/md1 mdadm: Cannot get exclusive access to /dev/md1:Perhaps a running process, mounted filesystem or active volume group? Huh? lsof /dev/md1 <nothing!> I remounted the fs and tried lsof <fs> and it was empty too. I can't seem to find any reason why mdadm --stop should not allow stopping this array. Any ideas? Anything other than lsof that can help find out why?

1 1

OBD-II compliant car diagnostic tool
by Daryl F 15 Mar '13

15 Mar '13

My adventure with OBD II and Linux began at http://www.vanheusden.com/O2OO/ The chip that makes the tool work so well is the ELM327 from Elm Electronics @ www.elmelectronics.com. Elm has several ELM32x chips for differing OBD and CAN uses. Most output to RS-232 so they are typically packaged with an FTDI serial-to-USB converter but some are packaged with a Bluetooth chip. The Australian outfit I ordered from was dx.com as recommended by Mr. Vanheusden. Depending on which Linux distro used you may have to compile some of the dependencies yourself even though the tool itself is written in Python. -Daryl

5 6

Speaking of ACM ...
by Dan Keizer 14 Mar '13

14 Mar '13

... with our little discussion on the ACM last meeting this fits right in there ...The 2012 ACM Turing Award has been announced -- advances in cryptography :-) I remember that paper being discussed while I was in 3rd year comp sci ... http://www.acm.org/press-room/news-releases/2013/turing-award-12 I find good value in ACM membership ... for those not aware, here are the benefits: http://www.acm.org/membership/benefits https://campus.acm.org/public/qj/brandingqj/cacm_reasons.cfm Dan.

1 0

shell/term zealots, any ideas?
by Trevor Cordes 11 Mar '13

11 Mar '13

What should we be setting our TERM env var to in normal linux graphical (and non-graphical) environments? So that it's always happy whether logging in at the console or via an xterm/gnoneterm on same box or via ssh? I was using TERM=linux but that crashes tcsh now. Background story, a fun new bug: https://bugzilla.redhat.com/show_bug.cgi?id=813607 Can skip straight down to my posting (near/at bottom dated 2013-03-11).

3 2

MUUG Meeting, Mar 12, 7:30pm -- Mini-Topic Trio
by gedetil＠cs.umanitoba.ca 05 Mar '13

05 Mar '13

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, March 12. The meeting topic for this month is as follows: Mini-Topic Trio Linux allows you to do some pretty cool stuff with digital cameras. Trevor Cordes will demonstrate how to use Linux to control a Canon SLR, and do some neat post-processing tricks such as exposure bracketing (AEB). After 30 years, the writing is on the wall for the venerable MBR (Master Boot Record). Now that drives larger than 2 TB are commonly available, something else will have to replace it. That something is heir-apparent GPT (GUID Partition Table). Kevin McGregor will discuss the history of disk partitioning, and how to make use of disks larger than 2 TB under Linux. The March RTFM will feature Gilbert Detillieux, talking about the rpm(8) and yum(8) commands, used for package management in Red Hat and similar Linux distributions. The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ********************************************************************** Please note our *NEW* meeting location: Room 1L08, Lockhart Hall, University of Winnipeg, entrance on Ellice Ave. between Spence St. and Balmoral St. Parking is available on the surrounding streets and in the lots on nearby streets. Look for signage once you're at the building, or ask a security guard. ********************************************************************** For more information about MUUG, and its monthly meetings, check out their Web server: http://www.muug.mb.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: http://www.muug.mb.ca/meetings/MUUGmeeting.pdf -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

1 0

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

Roundtable March 2013