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Poor perfmance of bridged interfaces
by Sergio Belkin 25 Nov '15

25 Nov '15

Hi, I've created a bridge using 2 interfaces and have a lot of messages as follows: nov 12 15:30:22 localhost kernel: br0: received packet on enp0s3 with own address as source address nov 12 15:30:22 localhost kernel: br0: received packet on enp0s3 with own address as source address And the operating systems is extremely slow Interfaces files : [root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-* DEVICE=br0 TYPE=Bridge BOOTPROTO=dhcp ONBOOT=yes #STP=on #DELAY=0 NM_CONTROLLED=no DEVICE=enp0s3 #HWADDR=08:00:27:AB:1D:E6 BOOTPROTO=none ONBOOT=yes NM_CONTROLLED=no BRIDGE=br0 DEVICE=enp0s8 HWADDR=08:00:27:A3:98:E6 BOOTPROTO=none ONBOOT=yes NM_CONTROLLED=no BRIDGE=br0 DEVICE=lo TYPE=loopback IPADDR=127.0.0.1 NETMASK=255.0.0.0 NETWORK=127.0.0.0 # If you're having problems with gated making 127.0.0.0/8 a martian, # you can change this to something else (255.255.255.255, for example) BROADCAST=127.255.255.255 ONBOOT=yes NAME=loopback I've disabled NetworkManager, but problem persists. System is: [root@localhost ~]# uname -a Linux localhost 3.10.0-123.el7.x86_64 #1 SMP Mon Jun 30 12:09:22 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux And is virtualized on VirtualBox Please could you help me to fix it? Thanks in advance! -- -- Sergio Belkin LPIC-2 Certified - http://www.lpi.org

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OT: Replacing Venerable NAS
by Tim Evans 25 Nov '15

25 Nov '15

I have an original-label Infrant (now NetGear) ReadyNAS storage appliance that's been running for 8+ years. Except for replacing its power supply, it has not skipped a beat in all this time. I use it primarily as a backup device (via NFS) for a couple of Linux machines, (via SMB) for a couple of Windows PC's, and (via ftp) for web sites at my hosting provider. SMART+ reporting shows ~75K hours operation, with zero sectors reallocated, on each of the four disks. I'm thinking I should be looking for a replacement, even with all this good info/luck. Would like to hear recommendations here. Besides the ReadyNAS, I have worked with a Thecus NAS (don't recall model). What are the features I should look at? Thanks. -- Tim Evans |5 Chestnut Court 443-394-3864 |Owings Mills, MD 21117

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Re: [CentOS] Google Ads in rsyslog documentation files
by m.roth＠5-cent.us 25 Nov '15

25 Nov '15

Peter Eckel wrote: > Hi all, > > I know this comes from upstream (and most likely from the rsyslog project itself), but what's your opinion about Google Ads in system documentation files? > >> [peckel@mucnvjmppmtr01 ~]$ cat /etc/redhat-release >> Red Hat Enterprise Linux Server release 6.7 (Santiago) >> [peckel@mucnvjmppmtr01 ~]$ grep google /usr/share/doc/rsyslog-5.8.10/* /usr/share/doc/rsyslog-5.8.10/rsyslog_secure_tls.html:google_ad_client = "pub-3204610807458280"; >> /usr/share/doc/rsyslog-5.8.10/rsyslog_secure_tls.html:google_ad_slot = "5958614527"; >> /usr/share/doc/rsyslog-5.8.10/rsyslog_secure_tls.html:google_ad_width = 125; <snip> > I find it rather disconcerting if there are commercial ads embedded in help texts I find on my open source servers. "Disconcerting" isn't the word I would use. Completely unacceptable is what I'd say. I think it's time to put in a bug report to upstream.... I need to check with my manager. I do note this is not the case in rsyslog on CentOS 7. mark

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Regional CentOS Specific Meetup groups
by Karanbir Singh 25 Nov '15

25 Nov '15

Hi, Just a quick post to say that I've setup a CentOS users group in the UK at http://www.meetup.com/CentOS-UK - aim to start organising regular demos and meetups face 2 face around the country. If you are based in the UK, I encourage you to come join the group. Also note that we have a CentOS group in India at http://www.meetup.com/CentOS-India/ and another group for the Netherlands at http://www.meetup.com/CentOS-Netherlands/ Regards and hope to see you at one of these meetups soon, -- Karanbir Singh, Project Lead, The CentOS Project +44-207-0999389 | http://www.centos.org/ | twitter.com/CentOS GnuPG Key : http://www.karan.org/publickey.asc

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How & where to add
by Siva Prasad Nath 24 Nov '15

24 Nov '15

auto eth0 iface eth0 inet static address 192.168.50.2 netmask 255.255.255.0 -- Shiva Prasad Nath 92981134

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LVM - stripped logical volumes by default?
by Rafał Radecki 24 Nov '15

24 Nov '15

Hi All. I am currently using OpenStack Juno on CentOS 7. The problem is that by default OpenStack's Cinder service creates logical volumes of "linear" type. I would like to have them stripped over all physical disks to get better write performance. Is there a way to tell LVM to create by default stripped volumes instead of linear ones? BR, Rafal.

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Re: [CentOS] Unit networkmanager.service not loaded
by Richard 24 Nov '15

24 Nov '15

> >> On Tue, Nov 24, 2015 at 11:01 PM, Richard wrote: > Date: Tuesday, November 24, 2015 22:48:30 +0800 > From: Siva Prasad Nath <shivaprasadnath21(a)gmail.com> > To: CentOS mailing list <centos(a)centos.org>, centos-devel(a)centos.org > Subject: [CentOS] Unit networkmanager.service not loaded > > systemctl stop networkmanager returns Unit > networkmanager.service not loaded > >> >> Hint -- try the: >> >> systemctl list-units | grep ... >> >> concept that you used previously and see what output you get. >> [sub-hint -- the *nix world is case sensitive.] >> >> This is a user (understanding) issue -- why are you including the >> "-devel" list? Don't. >> >> >>> Date: Tuesday, November 24, 2015 23:19:53 +0800 >>> From: Siva Prasad Nath <shivaprasadnath21(a)gmail.com> >>> >>> I can see below in development server >>> network.service >>> loaded active exited LSB: Bring up/down >>> networking NetworkManager.service >>> loaded active running Network Manager >>> >>> But not able to see in production. >>> >>> >>> Shiva Prasad Nath Well then, you need to figure out what you did differently in setting up these two environments. This is something specific to your process and procedures (or hardware/environment). There's not much that we can help you with as you haven't provided any details. Please do not top post on this list.

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Re: [CentOS] Unit networkmanager.service not loaded
by Richard 24 Nov '15

24 Nov '15

> Date: Tuesday, November 24, 2015 22:48:30 +0800 > From: Siva Prasad Nath <shivaprasadnath21(a)gmail.com> > To: CentOS mailing list <centos(a)centos.org>, centos-devel(a)centos.org > Subject: [CentOS] Unit networkmanager.service not loaded > > systemctl stop networkmanager returns Unit networkmanager.service > not loaded Hint -- try the: systemctl list-units | grep ... concept that you used previously and see what output you get. [sub-hint -- the *nix world is case sensitive.] This is a user (understanding) issue -- why are you including the "-devel" list? Don't.

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Unit networkmanager.service not loaded
by Siva Prasad Nath 24 Nov '15

24 Nov '15

systemctl stop networkmanager returns Unit networkmanager.service not loaded

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LVM - how to change lv from linear to stripped? Is it possible?
by Rafał Radecki 24 Nov '15

24 Nov '15

Hi All. Currently I am trying to change a logical volume from linear to stripped because I would like to have a better write throughput. I would like to perform this change "live" without stopping access to this lv. I have found two interesting examples: http://community.hpe.com/t5/System-Administration/Need-to-move-the-data-fro… http://www.depesz.com/2015/10/08/converting-logical-volume-so-that-its-stri… Both say basically to: - change the lv to a mirrored one by adding a stripped copy (~second device in RAID1) - change it back to a non-mirrored one by removing the primary linear lv (~first, source device in RAID1) My os is: $ cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core) $ uname -r 3.10.0-229.14.1.el7.x86_64 $ rpm -qa | grep -i lvm lvm2-libs-2.02.115-3.el7_1.1.x86_64 lvm2-2.02.115-3.el7_1.1.x86_64 And the solution proposed in above examples does not work on it. After (lv xxx is only on /dev/sdb4 before): # lvconvert --mirrors 1 --stripes 4 /dev/cinder-volumes/xxx /dev/sda4 /dev/sdc4 /dev/sdd4 /dev/sdf4 I am getting in "lvdisplay -m": --- Logical volume --- LV Path /dev/cinder-volumes/xxx LV Name xxx VG Name cinder-volumes LV UUID AKjKAo-66cv-Ygc2-4Ykq-sSJQ-RJOY-mfjoMD LV Write Access read/write LV Creation host, time test.local, 2015-10-28 17:45:28 +0100 LV Status available # open 1 LV Size 64.01 GiB Current LE 16386 Mirrored volumes 2 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:22 --- Segments --- Logical extents 0 to 16385: Type raid1 Monitoring monitored Raid Data LV 0 Logical volume xxx_rimage_0 Logical extents 0 to 16385 Raid Data LV 1 Logical volume xxx_rimage_1 Logical extents 0 to 16385 Raid Metadata LV 0 xxx_rmeta_0 Raid Metadata LV 1 xxx_rmeta_1 And in "pvdisplay -m": --- Physical volume --- PV Name /dev/sda4 VG Name cinder-volumes PV Size 2.73 TiB / not usable 4.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 715255 Free PE 287476 Allocated PE 427779 PV UUID IrkkwI-AqpP-bTll-vlPq-NDSe-rDUg-ecAnkp ... Physical extent 427776 to 427776: Logical volume /dev/cinder-volumes/xxx_rmeta_1 Logical extents 0 to 0 Physical extent 427777 to 444162: Logical volume /dev/cinder-volumes/xxx_rimage_1 Logical extents 0 to 16385 --- Physical volume --- PV Name /dev/sdb4 VG Name cinder-volumes PV Size 2.73 TiB / not usable 4.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 715255 Free PE 698868 Allocated PE 16387 PV UUID hx0a1v-M68S-aPBL-1x9r-8EiD-3cu3-GQPLRo --- Physical Segments --- Physical extent 0 to 0: Logical volume /dev/cinder-volumes/xxx_rmeta_0 Logical extents 0 to 0 Physical extent 1 to 16386: Logical volume /dev/cinder-volumes/xxx_rimage_0 Logical extents 0 to 16385 Physical extent 16387 to 715254: FREE So the migration to a RAID1 logical volume is successful but the stripping (above "lvconvert --mirrors 1 --stripes 4 /dev/cinder-volumes/xxx /dev/sda4 /dev/sdc4 /dev/sdd4 /dev/sdf4") is not taken into consideration because only /dev/sda4 and /dev/sdb4 are used for xxx logical volume afterwards. Also when I run: # lvconvert -m 0 /dev/cinder-volumes/xxx /dev/sdb4 afterwards I get xxx logical volume only on /dev/sda4 and it is linear (not stripped). Can someone help me with this? ;) BR, Rafal.

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