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FTP server mirroring (push not pull)
by Mark Rogers 06 Jul '12

06 Jul '12

I have a system which uploads data to my FTP server periodically. I need to upload any files that arrive to a second (and possibly third) FTP server. The points that make it not fit a traditional mirroring is that (a) my FTP server needs to push the files out to the other server(s) rather than have them pull the files in, and (b) the data needs to be synchronised as fast as possible after it arrives (the files are alarm logs amongst other things). So an hourly or daily cronjob won't suffice. Although I have control over my own FTP server, I can't make any assumptions about the third party servers in terms of their O/S, functionality, FTP server software, etc. Any suggestions for the best place to start with this? -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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Barclays Online Banking
by Ted.Harding＠wlandres.net 05 Jul '12

05 Jul '12

Greetings all! Anyone out there who banks with Barclays and is having problems accessing Online Banking with Linux? I last logged in 6 days ago with no problems. Today, when I try to access it, no login page comes up -- it just hangs forever. So I can't even try to get started! I'm using (an admittedly slightly elderly) Iceweasel 2.0.0.19 of 2006 on a Debian Etch 2.6.18 last updated Feb 2010. Any suggestions most welcome! Best wishes to all, Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding(a)wlandres.net> Date: 12-Jun-2012 Time: 19:00:45 This message was sent by XFMail -------------------------------------------------

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Storing data samples with low overheads
by Mark Rogers 04 Jul '12

04 Jul '12

I'm writing an application to run on small ARM units. It collects data from various sources at varying frequencies (up to once per second) and needs to store them. The number of discrete values will vary but we're running tests on around 200 data points dropping the data into MySQL. By "varying frequencies" what I mean is that some items will be read every second, others less frequently (say once every 30mins), so I need a data structure that will cope with that but my tests are currently on the worst-case of storing everything every second (or trying to!) One option is to have a table per item, comprising little more than timestamp and value. Our tests so far have taken 2-5s to store 200 samples this way. We're looking at other ways (eg one table for all samples, storing an item id, timestamp and value). However I can't help think that MySQL is overkill and an overhead we could do without. So, does anyone have any suggestions? We could build our own data storage system - the applications I've seen before that do this would probably have a single binary file per day/week/month of data for any single item, storing a single timestamp (marking the start of the file) and sample period, followed by 4 bytes per sample at the appropriate offset into the file from there; reading or writing just becomes a case of working out which file to look at and the offset into that file. But I'd rather not go quite so low-level if I can avoid it. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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[ALUG Announce] ALUG Norwich Pub Meet Thursday 12th July
by Viperfang 04 Jul '12

04 Jul '12

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce ----- Hello Norwich Aluggers, Our monthly ALUG Norwich social meeting will be held this Thursday, 12th July at The Coach and Horses (82 Thorpe Road, Norwich, NR1 1BA). The meeting officially starts at 8pm, although some people may arrive earlier. More information on those people can be found on the list and the IRC channel. If you are unsure if you will recognise us then make yourself and your intent to attend known by either posting on list or visiting us on IRC so we can look out for you rather than hiding in the corner. Optionally you could ask at the bar if they know where the geeky computer weirdos are and they'll point you in the right direction (seriously!). Another possibility is look for heaps of electronics on a table that may possibly look like movie props that would used for detonating explosives. Feel free to bring electronics/laptops/gadgets to the meet, you will by no means be alone. Ben Bewick aka Viperfang NB: This mail is automated, please refer to the usual sources for more information. ALUG Contact Details: Website : http://www.alug.org.uk/ IRC : #alug on irc.alug.org.uk List : http://lists.alug.org.uk/mailman/listinfo Twitter : http://twitter.com/anglianlug Identica: TBA Facebook: http://www.facebook.com/group.php?gid=2381613902 ----- Send discussion replies to main(a)lists.alug.org.uk (Reply-To set) Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce

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2600 meeting at 18:00 on Friday the 6th July.
by Viperfang 03 Jul '12

03 Jul '12

Quick heads up about this months Norwich 2600 meeting, more info at http://www.norwich2600.co.uk

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Lenovo T520
by Paul Grenyer 02 Jul '12

02 Jul '12

Hi All I'm still having lots of wifi and 3G card related problems with my Lenovo T520 and Linux Mint 13 (I though it was 12, it was 13). Does anyone have a similar machine (or even the same machine) that they're successfully working with? Maybe I could pick your brains at one of the pub meets? -- Thanks Paul Paul Grenyer e: paul.grenyer(a)gmail.com b: paulgrenyer.blogspot.com t: pjgrenyer ACCU Member: License to code. (http://www.accu.org)

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2600 meeting at 18:00 on Friday the 1st June.
by Viperfang 29 Jun '12

29 Jun '12

Quick heads up about this months Norwich 2600 meeting, more info at http://www.norwich2600.co.uk

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Open source alternative to full fat Adobe?
by Bev Nicolson 26 Jun '12

26 Jun '12

Evince is great for what it does, imo, but you can't extract pages with it. Does anyone round here know of a good alternative to the full-fat, all singing all dancing but not very cheap Adobe? Does such a thing exist? Bev.

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SOund unavailable on Flash Player
by Ted.Harding＠wlandres.net 24 Jun '12

24 Jun '12

Greetings All! Just now, wanting to play a YouTube video, I found that the sound on Flash Player is turned off, and I can find no way to turn it on again. The "speaker" icon in the bottom bar as an "X" beside it, indicating that it is turned off, and I can find no way to turn it back on again (e.g. clicking on the icon, or on the "X", produces not response; and looking into Settings after right-clicking on the Flash Player screen offers no help). However, everything was fine a few days ago, and I'm not aware of having done anything which might cause this problem. Also, the YouTube video is indeed the same one which I had watched a fews days ago with no problem. Can anyone offer any help with this problem? Adobe Flash Player 10 Iceweasel 3.0.6 (2009) Debian Lenny 2.6.26 ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding(a)wlandres.net> Date: 24-Jun-2012 Time: 12:23:35 This message was sent by XFMail -------------------------------------------------

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Wierd hang(s) when using grep
by Chris Green 20 Jun '12

20 Jun '12

Over the past few months I've noticed that when I run grep it sometimes appears to hang, I had put it down to doing "grep -r" down a rather large file hierarchy but now it's happening with a perfectly simple grep:- www-data$ ls *.txt sidebar.txt start.txt www-data$ grep xxx *.txt www-data$ grep fred *.txt www-data$ grep 'CLEARFLOAT' *.txt ... and there it sits, still (like 5 minutes later). The two .txt files are only a few tens of bytes long. It's not using any processor time, it's just stuck. I have just done it again in another terminal window, quotes removed but otherwise the same:- www-data$ grep fred *.txt www-data$ grep CLEARFLOAT *.txt ^C www-data$ ... and with a different user (in the same directory):- chris$ cd /home/www-data/www/wiki/data/pages chris$ grep fred *.txt chris$ grep CLEARFLOAT *.txt ^C chris$ So, what am I missing? -- Chris Green

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