Discuss March 2011

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286 participants
250 discussions

Re: [CentOS] CentOS and Marvell SAS/SATA drivers
by Chuck Munro 06 Mar '11

06 Mar '11

On 03/04/2011 09:00 AM, Les Mikesell wrote: > > On 3/3/11 6:52 PM, Chuck Munro wrote: >> > >> > I've been on a real roller coaster ride getting a large virtual host up >> > and running. One troublesome thing I've discovered (the hard way) is >> > that the drivers for Marvell SAS/SATA chips still have a few problems. >> > >> > After Googling around quite a bit, I see a significant number of others >> > have had similar issues, especially evident in the Ubuntu forums but >> > also for a few RHEL/CentOS users. >> > >> > I have found that under heavy load (in my case, simply doing the initial >> > sync of large RAID-6 arrays) the current 0.8 driver can wander off into >> > the weeds after a while, less so for the older 0.5 driver in CentOS-5. >> > It would appear that some sort of bug has been introduced into the newer >> > driver. >> > >> > I've had to replace the Marvell-based controllers with LSI, which seem >> > rock solid. I'm rather disappointed that I've wasted good money on >> > several Marvell-based controller cards (2 SAS/SATA and 2 SATA). > > I replaced separate SII and promise controllers with a single 8-port Marvell > based card and thought it was a big improvement. No problems with centos5.x, > mostly running RAID1 pairs, one of which is frequently hot-swapped and > re-synced. I hope its not going to have problems when I upgrade. > Since I have the luxury of time to evaluate options, I've just downloaded Scientific Linux 6 to see what happens with either the mvsas or sata-mv driver. This is my first experience with SL but I wanted native ext4 rather than the preview version in CentOS-Plus. Even if I stick with SL-6 as the KVM host, I'll continue using CentOS as guest machines. If the Marvell drivers don't pan out, it looks like I'll have to either spend money on a 3Ware|LSI|Promise controller or revert to CentOS-Plus 5.5 for ext4. SL-6 is installing as I write this. Chuck

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Re: [CentOS] CentOS and Marvell SAS/SATA drivers
by Chuck Munro 06 Mar '11

06 Mar '11

On 03/05/2011 09:00 AM, Nico Kadel-Garcia wrote: > > On Fri, Mar 4, 2011 at 4:16 PM, compdoc<compdoc(a)hotrodpc.com> wrote: >>> >>If the Marvell drivers don't pan out, it looks like I'll have >>> >>to either spend money on a 3Ware|LSI|Promise controller >> > >> > The 3ware are excellent... > And Promise, historically, is*not*. > > Yes, I've had problems with Promise cards in the past, but haven't bought any for a long time. They seem to be moving upscale these days. Regarding the Marvell drivers, I had good luck with the 'sata_mv' driver in Scientific Linux 6 just yesterday, running a pair of 4-port PCIe-x4 Tempo 'Sonnet' controller cards. So it appears someone has fixed that particular driver. I've decided to stick with those cards rather than re-install the Supermicro/Marvell SAS/SATA 8-port controllers, which use the 'mvsas' driver that I had problems with on the RHEL-6 evaluation distro. So far, SL-6 has performed very well, all RAID-6 arrays re-synced properly, and running concurrent forced fscks on eight arrays was very fast (because the ext4 filesystems were still empty :-) ). I think I'll stick with SL-6 as the VM host OS, but will use CentOS for the guest VMs. CentOS-5.x will do fine for now, and I'll have the luxury of upgrading guest OSs to CentOS-6 as the opportunity arises. Chuck

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bind 9.7.3 and libp11 engine_pkcs11 of fedoca core 14
by fakessh ＠ 05 Mar '11

05 Mar '11

hello list centos. I installed the packages libp11 and engine_pkcs11 of fedora core 14 on my centos 5.5 to allow me to compile the latest version of bind. this is the only way I found to compile bind 9.7.3. you know another way to compile bind 9.7.3 on centos 5.5 thanks for all your return -- gpg --keyserver pgp.mit.edu --recv-key 092164A7 http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x092164A7

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Re: [CentOS] Gnu Screen - terminal issues
by Nico Kadel-Garcia 05 Mar '11

05 Mar '11

On Sat, Mar 5, 2011 at 12:50 AM, Larry Vaden <vaden(a)texoma.net> wrote: > On Fri, Mar 4, 2011 at 6:46 PM, Nico Kadel-Garcia <nkadel(a)gmail.com> wrote: >> >> It's default behavior for the Nomachine Windows client. When you close >> it, it asks if you want to "disconnect" or "terminate" the session. >> Whether it works well is heavily dependent on the server, whether >> Neatx, FreeNX, or the NoMachine server. > > Please extend your remarks about which server you think is best and why. > > thanks/ldv Larry, please check the archives. I already covered that.

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Re: [CentOS] HOW to REDIRECT to HTTPS?
by Kai Schaetzl 05 Mar '11

05 Mar '11

Ralph Angenendt wrote on Thu, 3 Mar 2011 16:26:29 +0100: > Hope I remember it this evening. No real access to the CentOS mail stuff > from here :) Hi Ralph, wollte nochmal an das unsubscribe erinnern. Es ist: from: erikmccaskey64 <erikmccaskey64(a)zoho.com> Schöne Grüße, Kai

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IPTABLES rule for separating users
by erikmccaskey64 05 Mar '11

05 Mar '11

I have an OpenWrt 10.03 router [ IP: 192.168.1.1 ], and it has a DHCP server pool: 192.168.1.0/24 - clients are using it through wireless/wired connection. Ok! Here's the catch: I need to separate the users from each other. How i need to do it: by IPTABLES rule [ /etc/firewall.user ]. Ok! "Loud thinking": So i need a rule something like this [on the OpenWrt router]: - DROP where SOURCE: 192.168.1.2-192.168.1.255 and DESTINATION is 192.168.1.2-192.168.1.255 The idea is this. Ok! Questions! - Will i lock out myself if i apply this firewall rule? - Is this a secure method? [ is it easy to do this?: hello, i'm a client, and i say, my IP address is 192.168.1.1! - now it can sniff the unencrypted traffic! :( - because all the clients are in the same subnet! ] - Are there any good methods to find/audit for duplicated IP addresses? - Are the any good methods to find/audit for duplicated MAC addresses? - Are there any good methods to do this IPTALBES rule on Layer2?: `$ wget -q "http://downloads.openwrt.org/backfire/10.03/ar71xx/packages/" -O - | grep -i ebtables` `$ ` p.s.: The rule would be [is it on a good chain?]: iptables -A FORWARD -m iprange --src-range 192.168.1.2-192.168.1.255 --dst-range 192.168.1.2-192.168.1.255 -j DROP Thank you!

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KVM Question
by William Warren 05 Mar '11

05 Mar '11

I'm curious exactly how KVM works. If i see things right it's virtualization that's still within a full base operating system load correct? How does KVM perform against VMware which uses a much smaller footprint? Is KVM really a hypervisor? I'm just trying figure out the basics of KVM..:) Thanks, William Warren

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Re: [CentOS] Updating hardware clock from cron
by Matt 05 Mar '11

05 Mar '11

> Is there a package to do this? > > Normally the hardware clock is set during shutdown if one is running ntpd. > But if a long-running server shuts down unexpectedly, this isn't done, and > the hardware clock might be off by a lot when it comes back up. So setting > it periodically from a cron job could be useful. > > What do others do? Adding a one liner to /etc/cron.daily that invokes > /etc/rc.d/init.d/ntpd would do it but it seems heavyweight to restart ntpd. > Alas, the script doesn't export just the sync_hwclock function. I add this to /etc/rc.local /usr/sbin/ntpdate us.pool.ntp.org Sets the clock on start up. Might run it by cron once a month or so too.

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top and allocation issues
by Michael D. Berger 05 Mar '11

05 Mar '11

In a context where exceptions are caught, I ran the fragment: cerr << "allocating" << endl; char* arr[100]; for (int jj = 0; jj < 10; ++jj) { cerr << "jj = " << jj << endl; arr[jj] = new char[2000000000]; sleep (30); } sleep (10); for (int jj = 0; jj < 10; ++jj) delete[] arr[jj]; cerr << "deleted" << endl; The exception was caught with jj = 1, i.e., on the second allocation. But on top, I see: top - 14:08:46 up 5:21, 10 users, load average: 0.04, 0.06, 0.08 Tasks: 158 total, 1 running, 157 sleeping, 0 stopped, 0 zombie Cpu(s): 2.7%us, 2.0%sy, 0.0%ni, 94.5%id, 0.6%wa, 0.1%hi, 0.1%si, 0.0%st Mem: 1941908k total, 1231804k used, 710104k free, 138372k buffers Swap: 3899384k total, 0k used, 3899384k free, 876020k cached and the "710104k free" suggests that I should have failed on the first allocation. Furthermore, the allocation did not alter the values in top (except for a little jitter). Wherein do I err? [~]$ uname -a Linux xxxxx 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:53:09 EST 2011 i686 i686 i386 GNU/Linux Thanks, Mike.

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virtualization on the desktop a myth, or a reality?
by Rudi Ahlers 05 Mar '11

05 Mar '11

I am busy setting up some XEN servers on a SAN for high availability and Cloud Computing, and thought it could be cool to setup virtualization on a CentOS 5.5 Desktop, running on a Core i3 + 4GB RAM, and use the SAN's storage to see if it could actually be worth my while to replicate a Cloud Computing setup in the office. And, cause I got a bit bored waiting for a few RAID-sets to finish initializing. So, I installed CentOS + KDE, chose the Virtualization package and used Virtual Machine Manager to setup another CentOS VM inside CentOS (I only have a CentOS ISO on this SAN, since we don't use Debian / Slackware / FC / Ubuntu / etc). The installation was probably about the same speed as it would be on raw hardware. But, using the interface is painfully slow. I opened up Firefox and browsed the web a bit. The mouse cursor lagged a bit and whenever I loaded a slow / large website, it seemed asif the whole VM lagged behind. The Virtual Machine didn't use much resources. I allocated 1CPU core & 512MB RAM to it Yes, I know that I could have used KVM, VMWare or VirtualBox, but I wanted to use what's included already. Cause, let's face it, many people (even though they're technically advanced users) don't know virtualization. And, granted, when we install Virtual Machines on a XEN server, we don't ever use X since the servers we run as web / email / database / file servers, so there's no need for X. BUT, I want(ed) to see if this is a reality for the average desktop user, or not really (yet?) seeing as most modern PC's have far more CPU & RAM resources than what is actually needed by most. I'm not talking about developers / graphic designers / etc. I'm talking about Bob, who uses his PC for email, internet, document writing, etc and needs to boot into Windows if he feels like playing Warcraft III or StarCraft II, or use Pastel, etc. Wouldn't it be nice to run Windows, of for that matter Solaris / FreeBSD / MAC (graphics designer) / another flavor of Linux / etc inside your favorite Linux, and access it from the Desktop without too much trouble? -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Discuss March 2011