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Sorry
by Wes James 19 May '14

19 May '14

Sorry for the messed up replies. The web based icloud interface forces the writer to reply at the top of the email and if you try to write at the bottom by deleting a few lines of the message or selecting the whole message, deleting it, adding some spaces and then pasting back and go to the end it and adding a reply, it kills the indentation. -wes

22 30

Large file system idea
by Steve Thompson 19 May '14

19 May '14

This idea is intruiging... Suppose one has a set of file servers called A, B, C, D, and so forth, all running CentOS 6.5 64-bit, all being interconnected with 10GbE. These file servers can be divided into identical pairs, so A is the same configuration (diks, processors, etc) as B, C the same as D, and so forth (because this is what I have; there are ten servers in all). Each file server has four Xeon 3GHz processors and 16GB memory. File server A acts as an iscsi target for logical volumes A1, A2,...An, and file server B acts as an iscsi target for logical volumes B1, B2,...Bn, where each LVM volume is 10 TB in size (a RAID-5 set of six 2TB NL-SAS disks). There are no file systems directly built on any of the LVM volumes. Each member of a server pair (A,B) are in different cabinets (albeit in the same machine room) and are on different power circuits, and have UPS protection. A server system called S (which has six processors and 48 GB memory, and is not one of the file servers), acts as iscsi initiator for all targets. On S, A1 and B1 are combined into the software RAID-1 volume /dev/md101. Similarly, A2 and B2 are combined into /dev/md102, and so forth for as many target pairs as one has. The initial sync of /dev/md101 takes about 6 hours, with the sync speed being around 400 MB/sec for a 10TB volume. I realize that only half of the 10-gig bandwidth is available while writing, since the data is being written twice. All of the /dev/md10X volumes are LVM PV's and are members of the same volume group, and there is one logical volume that occupies the entire volume group. An XFS file system (-i size=512, inode64) is built on top of this logical volume, and S NFS-exports that to the world (an HPC cluster of about 200 systems). In my case, the size of the resulting file system will ultimately be around 80 TB. The I/O performance of the xfs file system is most excellent, and exceeds by a large amount the performance of the equivalent file systems built with such packages as MooseFS and GlusterFS: I get about 350 MB/sec write speed through the file system, and up to 800 MB/sec read. I have built something like this, and by performing tests such as sending a SIGKILL to one of the tgtd's, I have been unable to kill access to the file system. Obviously one has to manually intervene on the return of the tgtd in order to fail/hot-remove/hot-add the relevent target(s) to the md device. Presumably this will be made easier by using persistent device names for the targets on S. One could probably expand this to supplement the server S with a second server T to allow the possibility of failover of the service should S croak. I haven't tackled that part yet. So, what failure scenarios can take out the entire file system, assuming that both members of a pair (A,B) or (C,D) don't go down at the same time? There's no doubt that I haven't thought of something. Steve -- ---------------------------------------------------------------------------- Steve Thompson E-mail: smt AT vgersoft DOT com Voyager Software LLC Web: http://www DOT vgersoft DOT com 39 Smugglers Path VSW Support: support AT vgersoft DOT com Ithaca, NY 14850 "186,282 miles per second: it's not just a good idea, it's the law" ----------------------------------------------------------------------------

8 16

Disabling IRQ 16
by Alessandro Baggi 19 May '14

19 May '14

Hi list, I've a problem with my system on CentOS 6.5 x86_64 on a workstation. During utilizzation, after several hours after boot (6/7 hours) I get an error: Disabling IRQ #16 and after this seems be that 3d acceleration is unloaded. This is a workstation with a dedicated vga (nvidia gt450) and 3 nics. This problem started when I've plugged the third nic. Without third nic all works very good. from /proc/interrupt: 16: 110 647 64858 0 0 0 0 0 IO-APIC-fasteoi ehci_hcd:usb1, ahci, eth3, nvidia I've tried to boot the system with irqpool without great results. I've tried to change my new third gb nic with a fast ethernet 10/100, thinking it was broken but the problem still persists. I've tried to replace my vga card with another, the problem still persists. From dmesg I get: Call Trace: <IRQ> [<ffffffff810e8fdb>] ? __report_bad_irq+0x2b/0xa0 [<ffffffff810e91dc>] ? note_interrupt+0x18c/0x1d0 [<ffffffff810e997d>] ? handle_fasteoi_irq+0xcd/0xf0 [<ffffffff8100faf9>] ? handle_irq+0x49/0xa0 [<ffffffff815315fc>] ? do_IRQ+0x6c/0xf0 [<ffffffff8100b9d3>] ? ret_from_intr+0x0/0x11 <EOI> [<ffffffff812e0bee>] ? intel_idle+0xde/0x170 [<ffffffff812e0bd1>] ? intel_idle+0xc1/0x170 [<ffffffff81426b67>] ? cpuidle_idle_call+0xa7/0x140 [<ffffffff81009fc6>] ? cpu_idle+0xb6/0x110 [<ffffffff8152143c>] ? start_secondary+0x2ac/0x2ef handlers: [<ffffffff813c4260>] (usb_hcd_irq+0x0/0x90) [<ffffffffa004d610>] (ahci_interrupt+0x0/0x790 [ahci]) [<ffffffffa00a2740>] (irq_handler+0x0/0x5a0 [firewire_ohci]) [<ffffffffa0bc98f0>] (rtl8169_interrupt+0x0/0x80 [r8169]) [<ffffffffa073e7a0>] (nv_kern_isr+0x0/0x80 [nvidia]) Disabling IRQ #16 I've inserted the third nic for channel bonding. What I can try to avoid this error? It's an hardware problem on mobo? Any hints will be good. Thanks in advance.

1 0

Heads up on local root escalation
by James Hogarth 19 May '14

19 May '14

Remember to be especially aware if you have systems that can potentially have code uploaded and run (ftp to httpd vhost or improper php config and file ownership/permissions). This does not affect el5 ... an el6 update is pending. https://access.redhat.com/security/cve/CVE-2014-0196

7 12

Re: [CentOS] Sorry
by Chris Weisiger 19 May '14

19 May '14

I'm posting from my phone so I can't bottom post, but I believe this thread has gone on way to long. Lets drop it and get back to what this mailing list is all about. I would rather read posts about the same technical things over and over again that have been asked hundreds of times. But when questions like that get asked, alot of times people reply by saying "search the archives" or have you searched google yet. Where as the top/bottom posting question I believe should be answered with the search the archives or search google answer. This is just my 2 cents. Now back to your regularly scheduled questions. -----Original Message----- From: "Dave Stevens" <geek(a)uniserve.com> Sent: ‎5/‎17/‎2014 7:07 PM To: "CentOS mailing list" <centos(a)centos.org>; "Alexander Dalloz" <ad+lists(a)uni-x.org> Subject: Re: [CentOS] Sorry Quoting Alexander Dalloz <ad+lists(a)uni-x.org>: > Am 17.05.2014 23:22, schrieb Always Learning: >> >> Top posting ALWAYS makes sense when the poster has included nearly 200 >> lines of redundant and time-wasting waffle from previous posters. > > False argument. > +1 _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

4 3

setting the device queue_depth
by axel.weber＠cbc.de 19 May '14

19 May '14

Hi, Due to limitations of our Storage we need to set the device queue_depth to 4. I did this with a script that basically does this: echo 4 > /sys/block/sdft/device/queue_depth. But after a few minutes it starts to grow until it reaches 32 again. What could cause that behavior? Furthermore the system doesn' t load my qlogic options. I have set them to: cat /etc/modprobe.d/qlogic.conf alias scsi_hostadapter1 qla2xxx options qla2xxx ql2xmaxqdepth=4 But the max queue depth is cat /sys/module/qla2xxx/parameters/ql2xmaxqdepth 32 Any help would be appreciated. Centos: CentOS release 6.3 (Final) Storage: DDN 9900 Qlogic: 2560 (using distri firmware) Cheers Axel

2 1

Samba4 questions
by Steve Campbell 19 May '14

19 May '14

I'm a little new to Samba when used as more than just a simple place to mount a single user to a single share, but we're now getting ready to replace our Netware servers with Samba, and I guess that means Active Directory DC. As I read more and more about this beast, I keep finding pages that indicate the samba4 rpms supplied with the Centos/RH distribution are not the full version and that I should get them from either samba.org or certain other sources that provide complete versions. These pages are a little dated, but not that old. Can anyone provide insight into what they've done in this situation and whether the samba rpms are now full versions? Most of what I have found on the web is dated around when samba4 just came out of beta through a little later. There doesn't seem to be much documentation on this subject on the web or through Amazon, so half of my time is spent searching instead of reading. A good source for reading would be appreciated as well. I can find plenty examples, just not definitive manuals. steve campbell

9 17

Re: [CentOS] Samba4 questions
by Alain Péan 19 May '14

19 May '14

Le 22/04/2014 22:14, Reindl Harald a écrit : >>> not perhaps, for sure >>> >> >>> >>samba-4.1.0-3.el7.x86_64 >>> >>samba-client-4.1.0-3.el7.x86_64 >>> >>samba-common-4.1.0-3.el7.x86_64 >>> >>samba-libs-4.1.0-3.el7.x86_64 >>> >> >> > >> >I notice it is "samba-common-4....", so samba 4 will be the default in RHEL 7, not samba 3.6.x? > samba 3.x is dead > Fedora did the swicth to 4.x long ago > RHEL7 is based on Fedora 19 / Fedora 20 > Thanks for the information. Samba 4 domains are a very different beast than samba 3.x ones (NT4 style). A samba 4 (AD style) includes its own DNS, its own LDAP etc... Alain

4 5

CENTOS and GlusterFS
by Alessandro Baggi 19 May '14

19 May '14

Hi list, I'm planning to setup a two-node "cluster" with file replication and samba. I've used drbd in the past with success, but now there isn't drbd on the official repo but only from elrepo. I want follow centos Line and than switch to GlusterFS. Said that, I'm new to GlusterFS. I have two hosts with a 2tb disk space for replica. I've ridden that glusterfs is not compatible with smb/cifs/nfs and that for this purpose I must mount locally the volume and share it with samba and the hosts must act as client and server at the same time. It is possibile shares a mounted disk on /data with samba, and apply a replica volume on /data without using glusterfs export? Example: [Host1] [Host2] /data -> smb /data -> smb gluster_replica<---------------->gluster_replica Ip and services will be managed from corosync+pacemaker. There will be problems and complication with this configuration about replication/sync? Thanks in advance. Alessandro.

4 3

firefox-29.0-5.1.el6
by Νικόλαος Γεωργόπουλος 17 May '14

17 May '14

New compilation of firefox (v. 29.0) build with 1) devtools-2 (http://people.centos.org/tru/devtools-2/readme) 2) python27 (from SCL) ( http://ftp.scientificlinux.org/linux/scientific/6.5/i386/external_products/… ) 3) icu-last-50.1.2 from remi (http://rpms.famillecollet.com/SRPMS/) https://drive.google.com/uc?id=0B9RlkKQB1POSOXk1OG5KODJNWFk&export=download https://drive.google.com/file/d/0B9RlkKQB1POSNW9YaWxBVWR6UVk/edit Sources: https://drive.google.com/file/d/0B9RlkKQB1POSems0VXNIWXVuSjg/edit?usp=shari… https://drive.google.com/file/d/0B9RlkKQB1POSY0RJQTFQWlk0N3M/edit?usp=shari… Waiting for comments ngeorgop

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