Discuss December 2013

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176 participants
154 discussions

packet traversal
by Robert Clove 06 Dec '13

06 Dec '13

Hi All I don't know whether i am asking on a correct list or not i have a query that how to know that what system call are called when packet enters the system or when we send a packet from a system? Thanks

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Dragging app between workspaces not working
by Wes James 06 Dec '13

06 Dec '13

When I try to drag an app between workspaces, it doesn't move. I'm using compiz. When I put an arrow over an app in the workspace panel viewer (whatever that is called), it says click to start dragging, but no go. Any ideas? Thanks, -wes

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Re: [CentOS] ZFS on Linux testing effort
by Chuck Munro 06 Dec '13

06 Dec '13

On 04.12.2013 14:05, nux(a)li.nux.ro wrote: >>> >>On 04.12.2013 14:05, John Doe wrote: >>>>> >>>>From: Lists<lists(a)benjamindsmith.com> >>>>> >>>> >>>>>>> >>>>>>Our next big test is to try out ZFS filesystem send/receive in >>>>>>> >>>>>>lieu >>>>>>> >>>>>>of >>>>>>> >>>>>>our current backup processes based on rsync. Rsync is a fabulous >>>>>>> >>>>>>tool, >>>>>>> >>>>>>but is beginning to show performance/scalability issues dealing >>>>>>> >>>>>>with >>>>>>> >>>>>>the >>>>>>> >>>>>>many millions of files being backed up, and we're hoping that ZFS >>>>>>> >>>>>>filesystem replication solves this. >>>>> >>>> >>>>> >>>>Not sure if I already mentioned it but maybe have a look at: >>>>> >>>>?http://code.google.com/p/lsyncd/ >>> >>I'm not so sure inotify works well with millions of files, not to >>> >>mention it uses rsync. :D >>> >> >>> >>-- Sent from the Delta quadrant using Borg technology! Nux! >> > >> >I can attest to the usefulness of 'lsyncd' for large numbers of files >> >(our file server has almost 2 million in active use, with a second >> >backup server that's lsync'd to the first. >> > >> >Things to note: >> >- Yes, lsyncd does use rsync, but it issues an 'exclude *' followed by >> >the list of only the file(s) that need updating at that moment. >> > >> >- The inotify service can be jacked waaaay up (three kernel >> >parameters) >> >to handle millions of files if you wish. Just make sure you have lots >> >of RAM. > Be careful with it. Sadly I found out that inotify would consistently > fail on InnoDB files (ibd); I had to use stupid while loops and check > mtimes to perform some stuff that inotify-cron would've done much more > elegantly ... > > -- Sent from the Delta quadrant using Borg technology! Nux! Interesting point, something I didn't know. Fortunately in my case there are no db files involved directly, just db dumps wrapped in a tarball along with other associated stuff, sent from other servers. I would expect that lsync'ing db files could be a nasty non-stop process if the database is constantly being updated, so using db tools for replication would be best, configuring inotify/lsyncd to ignore the db directories. I believe by default that lsyncd instructs rsync to do whole-file transfers, so a large db could be a real problem. Thanks for the important heads-up!

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Third-party SATA-RAID cards suggestions
by Sorin Srbu 06 Dec '13

06 Dec '13

Hi all, Would anybody care to suggest a third party SATA-RAID card that works out of the box with CentOS 6, without having to jump through hoops to make it work? The card should preferably be able to connect ten harddrives, but I guess three four-port cards should work as well. There's no need for anything fancy really, as long as I can create a single big software-raid on it at CentOS install-time. So far I've tried a Highpoint RocketRAID 2740 and a LSI 9201-16i without too much success. Thanks for any suggestions in advance! -- BW, Sorin ----------------------------------------------------------- # Sorin Srbu, Sysadmin # Uppsala University # Dept of Medicinal Chemistry # Div of Org Pharm Chem # Box 574 # SE-75123 Uppsala # Sweden# # Phone: +46 (0)18-4714482 # Visit: BMC, Husargatan 3, D5:512b # Web: http://www.orgfarm.uu.se ----------------------------------------------------------- # () ASCII ribbon campaign - Against html E-mail # /\ # # This message was not sent from an iProduct! # # MotD follows: # Legacy MS Tag: The best way to accelerate Windows is at escape velocity.

5 14

To discard... or not to discard...
by John Doe 06 Dec '13

06 Dec '13

Hi, I just recently read a post about SSD triming (discard vs fstrim): http://www.howtogeek.com/176978/ubuntu-doesnt-trim-ssds-by-default-why-not-… far I used discard on all my SSDs. Now I am wondering if it is really worth it to switch them all to a crontabed fstrim... Anyone made the switch yet? Thx, JD

6 8

ADMIN issue - manitu
by m.roth＠5-cent.us 06 Dec '13

06 Dec '13

I've been blocked twice this morning, and removed myself once - the first time, by the time I got to work and looked at the list, it was already gone. My hosting provider works with those jerks at manitu. I've ranted a number of times over the years at why their method is a *lousy* method for blocking spam in the second decade of the 21st century. Now this: here's another argument as to why the CentOS list should stop using them... when I went to remove myself, the email that told me I'd been blocked, also said who'd reported my mailserver (that is, hostmonster's mailserver) as sending spam was someone at selfip.biz. Go do a whois on them - it's someone at home, using dyndns, not an open obvious company. This means that anyone who gets annoyed at *anyone* served by any ISP can report them, and block everyone at that ISP. Go ahead, tell me this is *reasonable* in 2013. mark

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Re: [CentOS] Fwd: 64bit centos and wine
by Igor Littig 06 Dec '13

06 Dec '13

Thanks, I was able to upgrade yum by deleting some mirrors which I didn't need slready. But I still cannot install wine. When I'm running configure script I'm getting "checking whether gcc -m32 works... no configure: error: Cannot build a 32-bit program, you need to install 32-bit development libraries." However, I've got "libstdc++-4.4.7-4.el6.i686" installed. Maybe "configure" search the lbraries in a wrong place ? 2013/12/6 Reindl Harald <h.reindl(a)thelounge.net> > other mirrors, some outdated, some not > currently CentOS 6.5 is reaching the users > > try downgrade the x86_64 version temporary > or "rm -rf /var/cache/yum/*" to hopefully > catch a different mirror > > i have not seen gnutls-2.8.5-15.el6.x86_64 here > by myself - so this is interesting, maybe this > one is very recently packaged > > Am 06.12.2013 10:12, schrieb Igor Littig: > > ---------- Forwarded message ---------- > > From: Igor Littig <igor.littig(a)gmail.com> > > Date: 2013/12/6 > > Subject: Re: [CentOS] 64bit centos and wine > > To: Reindl Harald <h.reindl(a)thelounge.net> > > > > > > I've been trying to do "yum upgrade" right now, but I'm getting the same > > multilib error with "gnutls" package and it stops > > "gnutls-2.8.5-15.el6.x86_64 != gnutls-2.8.5-10.el6_4.2.i686". > > > > 2013/12/6 Reindl Harald <h.reindl(a)thelounge.net> > > > >> Am 06.12.2013 08:10, schrieb Igor Littig: > >>> Thanks for the response, but the link did not help. When I try to > install > >>> wine it says > >>> > >>> "configure: error: Cannot build a 32-bit program, you need to install > >>> 32-bit development libraries." > >>> > >>> But when I'm installing " libstdc++.i686" I'm getting the error > >>> > >>> "Protected multilib versions: libstdc++-4.4.7-4.el6.i686 != > >>> libstdc++-4.4.7-3.el6.x86_64" > >>> > >>> Does anybody have ideas how can I work around this problem ? > >> > >> what about doing "yum upgrade" before? > >> your installed x86_64 package is simply outdated and multilib must match > >> > >> libstdc++-4.4.7-4.el6.i686 > >> libstdc++-4.4.7-3.el6.x86_64 > >> > >> mine: Nov 27 10:55:38 Updated: libstdc++-4.4.7-4.el6.x86_64 > >

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64bit centos and wine
by Igor Littig 06 Dec '13

06 Dec '13

Hello everyone. Has anybody ever tried to install 32bit wine to 64bit centos. I was able to run 64 bit wine, but some of mine application require 32 bit wine, but I cannot install it. It says to install 32bit development libraries at first. Does it make sense, what I'm doing ? I will be really appreciated any help. Cheers Igor

4 4

Re: [CentOS] Third-party SATA-RAID cards suggestions
by m.roth＠5-cent.us 06 Dec '13

06 Dec '13

Keith Keller wrote: > On 2013-12-05, Sorin Srbu <Sorin.Srbu(a)orgfarm.uu.se> wrote: >> Would anybody care to suggest a third party SATA-RAID card that works out of the box with CentOS 6, without having to jump through hoops to make it >> work? >> >> The card should preferably be able to connect ten harddrives, but I guess three four-port cards should work as well. There's no need for anything >> fancy really, as long as I can create a single big software-raid on it at CentOS install-time. > > There's little reason to do that if you have a real hardware RAID card. (I won't say "no reason", but it would have to be extremely compelling for it to be wise to go that route.) > >> So far I've tried a Highpoint RocketRAID 2740 and a LSI 9201-16i without too much success. > > The MegaRAID 9271 works OOTB with CentOS 6.4. Every 3ware card (also from LSI) I've used also works OOTB with CentOS. If you are new to hardware RAID, the 3ware interface is a lot easier to learn than the MegaRAID's. (I suspect that other LSI cards, including the 9201, work fine with CentOS too; perhaps you can post your error messages so we can see what's wrong, instead of replacing a working controller.) I tried to respond to this earlier, but *%@#$%^& manitou blocked me again. I wouldn't recommend the RocketRaid. We have a few of them here; they work ok, but Highpoint, who makes them, are *not* really great about updating drivers once the card's out their door. The last one we put back into service, I had to find the last source code they had for that card, several years old, and then fix the code before I could compile it. (At least it was in C). Second on MegaRAID. The ones we have here are the Dell rebranded PERCs, and we've never had trouble, except with ones nearly 10 years old. mark

3 3

Fwd: 64bit centos and wine
by Igor Littig 06 Dec '13

06 Dec '13

---------- Forwarded message ---------- From: Igor Littig <igor.littig(a)gmail.com> Date: 2013/12/6 Subject: Re: [CentOS] 64bit centos and wine To: Reindl Harald <h.reindl(a)thelounge.net> I've been trying to do "yum upgrade" right now, but I'm getting the same multilib error with "gnutls" package and it stops "gnutls-2.8.5-15.el6.x86_64 != gnutls-2.8.5-10.el6_4.2.i686". 2013/12/6 Reindl Harald <h.reindl(a)thelounge.net> > Am 06.12.2013 08:10, schrieb Igor Littig: > > Thanks for the response, but the link did not help. When I try to install > > wine it says > > > > "configure: error: Cannot build a 32-bit program, you need to install > > 32-bit development libraries." > > > > But when I'm installing " libstdc++.i686" I'm getting the error > > > > "Protected multilib versions: libstdc++-4.4.7-4.el6.i686 != > > libstdc++-4.4.7-3.el6.x86_64" > > > > Does anybody have ideas how can I work around this problem ? > > what about doing "yum upgrade" before? > your installed x86_64 package is simply outdated and multilib must match > > libstdc++-4.4.7-4.el6.i686 > libstdc++-4.4.7-3.el6.x86_64 > > mine: Nov 27 10:55:38 Updated: libstdc++-4.4.7-4.el6.x86_64 > >

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Discuss December 2013