Re: [Hampshire] constantly flickering LEDs on router, second try.
Lisi wrote: So - thank you all very much. And I am an idiot. In the literal sense, of course - but also in the modern derived sense. :-( don't be hard on yourself. Often situations like this are an excellent opportunity for learning. You are only an idiot if you keep making the same mistakes :-) regds -- Jon Wilks PGP key 0xFA593C1A from hkp://wwwkeys.uk.pgp.net -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] constantly flickering LEDs on router: Solved - amidblushes
Hi, Glad to be of help. You're not an idiot for not realising ktorrent would auto-restart :) TC, Paul. Sent from my BlackBerry® wireless device -Original Message- From: hants...@googlemail.com Date: Sun, 17 May 2009 22:27:01 To: hampshire@mailman.lug.org.uk Subject: Re: [Hampshire] constantly flickering LEDs on router: Solved - amid blushes Found this had gone from a dummy address and that is why it hadn't arrived - sorry, Paul. On Sunday 17 May 2009 20:14:31 you wrote: Please tell us a bit about the machine. OS and version. What software you have running. Do you have bittorrent? - Sorry - I ought to have said those. They are not even in the real email I sent after my slip. Answers: I have ktorrent. Konqueror, Iceweasel, KMail were running. OS Lenny. Sorry about the broken threading. I am having to juggle between GMail and KMail in order to get the right sender's address on here. Will now reboot and check again for KTorrent via ps. Thanks for reminding me. Paul - you are a genius and I am an idiot. ps -A | grep ktorrent followed by kill seems to have cured the problem. Very grateful thanks, Lisi -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk -- -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] constantly flickering LEDs on router: Solved - amid blushes
2009/5/17 hants...@googlemail.com
ps -A | grep ktorrent followed by
kill seems to have cured the problem.
I have had to do such things that many times that I came up with a one liner :
ps -eafw | grep morituri | awk '{print $2}' | xargs kill
Disclaimers:
Different people have different favourite 'ps' invocations embedded in
their finger memories. The above is mine.
A purist would say there should be a 'grep -v grep |' in the pipeline
as well. A /real/ purist would say there shouldn't and that there
should be one grep with a regex.
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[Hampshire] [hardware] RAID5 - hardware or software based?
I recently decided to upgrade my main desktop machine from a 2-disk RAID0 array (2 x 320GB) to a 4-disk RAID5 array (4 x 320GB). I already have / on a separate 150GB drive, so there are no concerns about trying to boot from the RAID setup. So far, I've taken the cheap route and run all the drives from the SATA ports on the motherboard (a Tyan Thunder, with 2 x 2GHz Opteron dual core processors and a total of 8GB RAM). I've been doing some scratching around, wondering whether to splash out on a hardware RAID controller to take the load of managing the RAID5 array off the CPU(s); most of the RAID controllers I've found have been either not really hardware RAID controllers (e.g. the LSI Logic 8204) or rather expensive (e.g. the Adaptec 3405 and up). Does anyone have any experience of using software-based RAID5 and/or a real hardware RAID controller which they'd like to share, please? Thanks in advance Ian -- Ian Park 17 Pyle Hill Newbury Berkshire RG14 7JJ Tel: +44 (0)1635 821420 GSM: +44 (0)7785 300290 email: i...@chalmers-park.name -- -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] [hardware] RAID5 - hardware or software based?
On Mon, May 18 at 10:38, Ian Park wrote: I recently decided to upgrade my main desktop machine from a 2-disk RAID0 array (2 x 320GB) to a 4-disk RAID5 array (4 x 320GB). I already have / on a separate 150GB drive, so there are no concerns about trying to boot from the RAID setup. So far, I've taken the cheap route and run all the drives from the SATA ports on the motherboard (a Tyan Thunder, with 2 x 2GHz Opteron dual core processors and a total of 8GB RAM). Been running a 4 drive software RAID5 at work for a couple of years now on a 2.4GHz Intel Core2 processor. The software overhead hasn't been noticeable so I guess you'd have no problems either. SATA x4 straight off the motherboard. New workstation builds we've gone back to using RAID1 simply because disk capacity has got so stupidly high a pair of disks is all you need. -- Bob Dunlop -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] [hardware] RAID5 - hardware or software, based?
On Mon, 18 May 2009 11:21:14 +0100 Bob Dunlop wrote: 8-- Been running a 4 drive software RAID5 at work for a couple of years now on a 2.4GHz Intel Core2 processor. The software overhead hasn't been noticeable so I guess you'd have no problems either. SATA x4 straight off the motherboard. 8-- Ah, thanks, that's very reassuring - I won't bother to spend the money on an Adaptec controller then! I notice that Adaptec recommend that you *don't* use desktop drives with the 3405, because (to paraphrase) they're not good enough - you should use enterprise class drives, which rather contradicts the inexpensive part of the RAID acronym... Cheers Ian -- Ian Park 17 Pyle Hill Newbury Berkshire RG14 7JJ Tel: +44 (0)1635 821420 GSM: +44 (0)7785 300290 email: i...@chalmers-park.name -- -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
[Hampshire] [OT] on the scrounge for SDR SDRAM memory
Has anyone got any of the following memory I can scrounge? Reasonable fee and postage happily paid! 168-pin DIMM Banking: 3 (3 banks of 1) Chipset: Intel 815E Error Detection Support: Non-ECC only Graphics Support: AGP 4X Max Component Density: 256Mb Max Unbuffered SDR SDRAM: 512MB Module Types Supported: Unbuffered only SDR SDRAM Frequencies: PC100 and PC133 Supported DRAM Types: SDR SDRAM only USB Support: 1.x Compliant I could do with a total of the max allowed of 512MB. Though any improvement on what is there now would be great! There are three slots, two of which have 128MB sticks in them. The third slot is empty. So one 512MB would be marvellous, as would 2x256, and 128MB would improve the present situation. By inference, the third slot could have 256MB in it. That is not explicitly spelt out anywhere, but there is a reference to 4 being the max possible no. of rows usable in PC133, which means if there are three sticks one of which has 2 rows, the other two must only have one. It would appear therefore that the 3 slots do not need to have identical sticks. The motherboard is an Intel D815EEA. TIA Lisi -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] [hardware] RAID5 - hardware or software, based?
Hi Ian, On Mon, May 18, 2009 at 02:00:30PM +0100, Ian Park wrote: On Mon, 18 May 2009 11:21:14 +0100 Bob Dunlop wrote: 8-- Been running a 4 drive software RAID5 at work for a couple of years now on a 2.4GHz Intel Core2 processor. The software overhead hasn't been noticeable so I guess you'd have no problems either. SATA x4 straight off the motherboard. 8-- Ah, thanks, that's very reassuring - I won't bother to spend the money on an Adaptec controller then! Indeed, unless under very heavy write load I expect software RAID will be fine. I notice that Adaptec recommend that you *don't* use desktop drives with the 3405, because (to paraphrase) they're not good enough - you should use enterprise class drives, which rather contradicts the inexpensive part of the RAID acronym... Yes I think they are trying to up sell. Decent SCSI/SAS drives would make a difference in both performance and reliability, but for SATA I feel it's much of a muchness. Certainly I use bog standard SATA II drives everywhere and still find that RAM fails more often than drives do. You may want to check if performance is acceptable with a drive failed. You can do this by only putting 3 drives in to start with and creating a 4 drive RAID-5. It will run degraded. You can then see if it performs well enough when degraded. If it doesn't then you will know to keep a hot spare (or a cold spare in a drawer). Cheers, Andy -- http://bitfolk.com/ -- No-nonsense VPS hosting The optimum programming team size is 1. Has Jurassic Park taught us nothing? -- pfilandr signature.asc Description: Digital signature -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] constantly flickering LEDs on router: Solved - amid blushes
Hi Victor,
On Mon, May 18, 2009 at 10:35:43AM +0100, Victor Churchill wrote:
I have had to do such things that many times that I came up with a one liner :
ps -eafw | grep morituri | awk '{print $2}' | xargs kill
Disclaimers:
Different people have different favourite 'ps' invocations embedded in
their finger memories. The above is mine.
A purist would say there should be a 'grep -v grep |' in the pipeline
as well. A /real/ purist would say there shouldn't and that there
should be one grep with a regex.
Someone else would use pkill instead of the lot of it. ;)
Cheers,
Andy
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mouth shut. -- The League Against Tedium
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Re: [Hampshire] constantly flickering LEDs on router: Solved - amid blushes
Andy Smith wrote: Someone else would use pkill instead of the lot of it. ;) I use killall. What's the difference? Dan -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] constantly flickering LEDs on router: Solved - amid blushes
2009/5/18 Daniel Pope ma...@mauveweb.co.uk: Andy Smith wrote: Someone else would use pkill instead of the lot of it. ;) I use killall. What's the difference? More than one way to do it I suppose. Just looking over the man page there looks like some overlap and some distinct features on each side. -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] [hardware] RAID5 - hardware or software, based?
On Mon, May 18, 2009 at 17:06:54 + (+), Andy Smith wrote: Indeed, unless under very heavy write load I expect software RAID will be fine. To explain this further, if you do a write on RAID-5, you often have to _read_ the disks first - this can add lots of latency. Personally, I do RAID-1 (software or hardware just _not_ fakeraid rubbish) on anything small (e.g. upto 4 disks). Anything big (read expensive), get a decent _battery backed_ hardware controller or an external RAID array with the same. If you do lots of small writes and wait for them to hit disk, this can make a massive difference (I've personally seen a box go from 100% IO bound to 1% IO when we discovered that the server had been shipped with battery backed RAID controller, but in write though not write back mode). Oddly enough the database went just a tad quicker. Regarding enterprise disks, I think it's mostly a completely fallacy reliability wise. Performance wise, a 15Krpm drive will out perform a 5400rpm drive. However there is another issue - how hard a disk will try and recover data. Western Digital RE (RAID Edition) drives give up quite early - they assume you are running in a RAID (not RAID-0) environment, so if they have trouble reading something, they give up quickly and carry on. Most desktop drives try _really_ hard (and don't give up) - thus they effectively lock up for a few mins upon encountering an error. Adrian -- Email: adr...@smop.co.uk -*- GPG key available on public key servers Debian GNU/Linux - the maintainable distribution -*- www.debian.org -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] constantly flickering LEDs on router: Solved - amid blushes
On Mon May 18, 2009 at 19:08:07 +0100, Daniel Pope wrote: Someone else would use pkill instead of the lot of it. ;) I use killall. What's the difference? On Solaris pkill does what you want, if it is available. On Solaris killall kills *all* processes. That's the kind of mistake you only make once .. Steve -- http://www.steve.org.uk/ -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] constantly flickering LEDs on router: Solved - amid blushes
Steve Kemp wrote: That's the kind of mistake you only make once .. So that's why the manpage says Be warned that typing killall _name_ may not have the desired effect on non-Linux systems, especially when done by a privileged user.! Dan -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
Re: [Hampshire] constantly flickering LEDs on router: Solved - amid blushes
Hello, On Mon, May 18, 2009 at 07:34:30PM +0100, Victor Churchill wrote: Semi seriously though: I do notice how as new releases come around, if one has come from a previous release there is probably a tendency to stick with the familiar way even if there are new easier ways. Oh yes, definitely. For example I find myself doing multiple file renames in a shell script even though almost every system comes with a rename script/command these days. Cheers, Andy -- http://bitfolk.com/ -- No-nonsense VPS hosting Ging i stopped taking my medication long ago. the ironey is it was for social anxioty disorder and now i daren't go back to the doctor to get another perscription signature.asc Description: Digital signature -- Please post to: Hampshire@mailman.lug.org.uk Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --
