CentOS 5 Hardware :: Setting Multipath In RHEL 5.4?
Apr 7, 2010
There is a server with two HBA QLA2460, connected via SAN to the SE9980 disk array. RHEL 5.4 (x86_64) is running on the server. In the SAN two zones are set up: HBA1-port1 9980; HBA2 - port2 SE9980. As a result, the server can see:
[Root @ c5 ~] # multipath-ll
mpath1 (1HITACHI_R45028F9022F) dm-2 HITACHI, OPEN-E
[Size = 14G] [features = 1 queue_if_no_path] [hwhandler = 0] [rw]
_ Round-robin 0 [prio = 0] [active]
_ 3:0:0:0 sdb 8:16 [active] [ready]
_ 4:0:0:0 sdc 8:32 [active] [ready]
_ 3:0:0:16384 sdd 8:48 [active] [ready]
[Code]...
Question: Why OS sees eight ways instead of two? Why do extra ways have such strange LUN (16384, 32768, etc.)?
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Mar 24, 2011
I have and RHEL5.4 conecceted to an SAN HSV200. When I present a LUN to it, In system-confg-lvm gui appears a device like /dev/mapth/mapth0 (that�s the correct device to multipath) and other like /dev/sda or /dev/dm-N, as uninitialized entities. How could I configure to not display this device (/dev/sda) and prevent human errors?
This is the things I need:
1- I want (if it is posible...) to disappear the part where it says "uninitialized entities"
2- Is It necesary mantain the partitioning done to default (like /dev/mapper/mpath0p1) with device-mapper-multipath (kpartx command)? or Can I delete it without future problems?
This is the actual configuration that I have:
1- /etc/lvm/lvm.conf
Code:
preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]
filter = [ "a/dev/mapper/mpath.*/","a/dev/cciss/.*/","r/.*/" ]
2- /etc/multipath.conf
Code:
#blacklist {
# devnode "*"
#}
[code].....
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Apr 17, 2011
after some yum update on my CentOS 5.6 server I noticed this error when the server is booting:
"dm multipath kernel driver not loaded"
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Feb 16, 2010
A client has sent me an RHEL 5.1 box for me to do some work on, but it's not registered with Red Hat. This is causing me problems, because it's a minimal installation, and I need some more dev software.My immediate reaction was to install various bits (emacs, and so on) from my Centos 5(.0) DVD.The base RHEL system only had one (disabled) repo entry,so I added a yum DVD repo entry in yum.conf.d.
This looked good to start with, but it doesn't work. Something in RHEL's pirut/yum/rpm/whatever is getting confused, and can't work out what is/isn't installed.
Question - how do you maintain an unregistered RHEL box? Has RH done something to make life difficult? Is my problem simply that I'm using a Centos 5.0 DVD, instead of Centos 5.1? Am I stuck with downloading lots of rpms from the net and doing everything manually? I really don't want to do that.
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Aug 3, 2011
I am new to linux.
I am trying to get vnc setup on my workstation.
I will paste some of the steps I have taken.
I downloaded the tigervnc and tigervnc-server through yum.
I setup the service file as so
Then when I go to start my server i get a FAILED message:
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Dec 3, 2010
I have recently setup a RHEL 5.3 server primarily to be used as an Apache web server. I also now have a requirement to have this server also service SFTP requests for uploading/downloading files.
1. By default RHEL 5.3 allows SFTP (over TCP port 22). However when searching for SFTP site setup I've come across the fact that RedHat recommends using vsftpd. So if I configure vsftpd, what happens to the default SFTP and the ability to remotely use something like PuTTY to SSH into the server? Really looking to see if SFTP or vsftpd is best. Also, is vsftpd as or more secure than FTP over SSH?
2. I've set aside a separate disk parition (to keep it away from the system partition to help lock down security) for the SFTP site. So I want to use that as the default SFTP root directory structure. How can this be achieved?
3. My requirements dictate 3 separate directories need to be used, each with their own associated SFTP user. The user can only read/write it's own directory structure and cannot navigate out of it. Also there will be a SFTP super user able to navigate through each of the 3 directory structures mentioned, but will not be able to navigate out of it's home directory. Can this be done, if so how?
There will be no SSL certificates in play at the moment. I'm more concerned about getting things setup and working correctly first. However there may be a requirement to use them later. The site will be accessed over the Internet initially, hence the reason I'm looking to make it as secure as possible while getting it up and running quickly.
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Jun 14, 2009
what rpms should I need install for setting up redhat cluster on RHEL 5.0 I want to create two RHEL 5.0 nodes as one cluster having oracle database server installed. And please note I have created these two nodes on VMware server for testing purpose. is it possible for creating cluster of two virtual guests.
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Feb 23, 2010
I am trying to see if there is an authbind equivalent or authbind package for CentOS/RHEL? x If so, where can I get more info and download it? It seems to be only available for Debian and Ubuntu.
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Aug 31, 2010
We are slowly migrating from a predominantly Windows house to a 50/50 Win/RHEL operation and even further in the future.Currently, we have a LOT of Windows folders that are created by custom applications which, upon creation of a new folder set, applies the corresponding ACL so that only the associated groups are able to access the folders. Now for the problem, we are migrating the applications to a RHEL55 environment and it is creating the folders on that system now but the groups are still residing in the Windows AD. Is there an "easy" (I know, a very relative term) to have the Windows groups given permission to the Linux shares without very much manual intervention?
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May 12, 2011
I have installed RHEL5U5 but I've also tested RHEL5U4 and the problem is: Once configured the multipath, I restart the server,and with the command-ll mutipath I can see the LUN presented correctly:
[Code].....
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Jul 27, 2010
I need to set up 1 disk, the disk is presented to the server on both fibre paths from the SAN. This is the current setup seen:
[Code]..
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Jun 21, 2010
Having some issues setting up sendmail on a (basically) blank RHEL 5.5 server setup. My ultimate goal is to be able to automagically send logs / errors / notifications to ourselves from the server.
Our basic setup is a Win 2003 domain with exchange running on mail.domain.com.au.
I've edited the '/etc/mail/sendmail.mc' and added the :
Code:
line to it.
Also added the domain (domain.com.au) to the '/etc/mail/local-host-names' files
Also edited submit.mc and added
Code:
When I try and send a mail from root or a test user to one of the domain accounts, it seems to go fine, i.e no errors are reported but it never gets delivered.
From the mail logs:
Code:
So it seems to be sent to the queue no problems and when I check the queue :
Code:
Total requests: 0
Not nothing ever gets received. Am I missing something? I have read and read and read but dont seem to be getting any furthur.
So in the end this server doesn't need to do anything except be able to send mail from root to an external mail address.
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Jan 10, 2010
our oracle(oracle 10G) server got a serious problem, the OS is SLES 9 SP4, two HBA adapters(QLogic 2340) with NetApp FC Storage(FAS3140), we have installed multipath-tools on this server and ensure that physical connection and swith configuration are correct, but we only can see a path
:~ # multipath -ll
360a98000572d4d414b4a522d7a62376d dm-2 NETAPP,LUN
[size=200G][features=0][hwhandler=0]
[code]....
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Apr 5, 2011
I upgraded a DL580 G4 server from Red Hat 4.4 to 5.2 (2.6.18-92.el5 #1 SMP Tue Apr 29 13:16:15 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux) and now when I run the multipath - l command I only see one path. There are 4 LUNs being presented on each fibre channel, so I should see sda - sdh in /dev, but I only see sda - sdd.
RPMs
device-mapper-1.02.24-1.el5
device-mapper-event-1.02.24-1.el5
device-mapper-multipath-0.4.7-17.el5
hp_qla2x00src-8.02.11-6
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Apr 9, 2010
I am working on a server which connected to two EMC storage box. when i am checking the multipath information of a disk its showing as 8 paths. how to understand 8 paths for a single disk.
[Code]....
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Jun 28, 2010
For a testing purpose iin our environment we need to setup a Linux based virtual machines.For that i come to know there is a option in RHEL using xen or kvm.can anyone provide me the detailed step by step for setting up virtualization in rhel?Also i have few doubts like, is redhat subscription needed for achieve this?also there is a possible to do vmotion thing which is in vmware,can we do that with rhel virtualization without rhel subscription.
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Jan 5, 2010
what is the diffrence between RHEL and Centos. diffrences between support,packges, Xwindow, organization funda, someone say redhat is launch Centos like fedora. but when fedora for beta, RHEL for tested with formal support so why redhat launch this Centos.i get some information from net but not sufficiant for me..
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Apr 3, 2010
I downloaded src of gcc 3.3.3 and tried to compile in RHEL 5 with the existing gcc 4.1.2.
Got following error
[root@localhost gcc-3.3.3-src]# pwd
/home/nikole/gccmy/gcc-3.3.3-src
[root@localhost gcc-3.3.3-src]# which gcc
[code]....
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Oct 14, 2015
After mapping iscsi storage from my netapp and scanning for new devices I run multipath -v2 to create the multipath device handle under /dev/mapping/. This normally takes about 2 seconds or less on every other linux distribution I use. On Stretch it takes a little over 3 minutes. I have tried several different versions of multipath.conf but the result is always the same.
My most recent multipath.conf file is available here : [URL] ....
and the output of multipath -v4 is available here : [URL] ....
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May 10, 2010
I have a linux machine, attached to a fibre channel SAN.
We're in the testing phases and we're attempting to get all of the bugs worked out before this goes live.
If i have my host streaming data to the storage device on the san (or from the device on the san) and simulate a path failure (by shutting down one of the host's ports on the FC switch), multipath does not pick up on another path until about 45 seconds have passed.
I can verify this by watching the statistic graph (which updates once per second) on the storage system.
I see iops running along rather nicely, and then they drop to 0 for 45 seconds, then pick right up to normal again.
This is a RehHat EL 5.5 system, with qlogic HBA's.
Am i being too picky? I'd expect multipath to recover in under 30 seconds, so as to not alarm host applications running on the linux host... 45 seconds seems like a long time to wait for a disk operation to complete.
Any tips on tuning Multipath, or the qlogic card? As it is, i've got the following options in my modprobe.conf.
alias scsi_hostadapter2 qla2xxx
Code:
My multipath.conf looks like:
Code:
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Jun 12, 2010
I have a software program that when you try to install it on Centos it returns "This programs requires RHEL 4" Is there a work around to get the software to use the Centos software the same as it would RHEL 4?
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Jul 21, 2011
For a audit script that I use, I need a hwinfo RPM for RHEL 5 or Centos 5/6 that works (Opensuse ones do not work). Is there one which anybody knows about?
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Nov 28, 2008
I have been trying all day but so far I am unable to configure yum to use a proxy server to retrieve updates.Due a recent compliance mandate direct internet access had to be removed for a pool of our Cent/RHEL servers. I have added the http_proxy environment variable in /etc/profile using:
export http_proxy=http://ourproxy:8080
export ftp_proxy=http://ourproxy:8080
export gopher_proxy=http://ourproxy:8080
I am using the FQDN of the proxy server, and i can ping that FQDN from the CLI without a problem. When I do this and I reboot the server I can get to the internet through the proxy using links/lynx. Yum however stalls out after loading plugins. I have read in a few places that I need a trailing / after the port number above, adding this and rebooting has no effect.
So I tried specifying the yum.conf file... [URL]. When I do this yum still tries to contact the redhat/cent network directly. No behavior change. If I use tcpdump I can see the server I am running yum on try to directly connect without the proxy, which times out for good reason.
The proxy server I am running is squid, but I can see the server I am running yum on blatantly ignore any proxy settings I have tried so far. I am really in a hole on this one as I have to get several updates to fix vulnerabilities found during our last scan.
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May 4, 2010
In general, how easy is it to convert between CentOS and RHEL (in either direction)?
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Jun 4, 2009
My doubt is " Can we install Xen 3.2 on RHEL version 3".
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Jul 9, 2009
I have a very unusual [and most likely unsupported] upgrade path I need to take.
I have two servers, both Dell PE1800's that I need to upgrade.
One of them is a Fedora Core 4 (x86) box and the second is RHEL5 x86_64.
I need to do an in-place upgrade to CentOS 5.3 without having to reinstall from scratch and keeping my downtime to an absolute minimum. Each of these servers has about 10TB of data stored and I really don't want to have to reformat and restore from backps.
How can I do this?
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Nov 14, 2009
I wanted to access a SAN partion from my two CentOS 5 servers.
1. i wanted to get mounted the partition which i have created in the SAN.for example /dev/sdb is the partition
2. at the same time i wanted to store (Read and write )data in the SAN partition from those two CentOS server.
3. Can we use GFS? or what is the best way?
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Apr 12, 2011
i want to remove a path, but is in use.. How can i kill the zombie processes?
[Code]....
I guess i was wrong deleting first the disks that formed the path, but now how could i kill those zombie processes without a reboot?
[Code]....
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Feb 20, 2011
I am currently setting up a Mono environment (mono, monodevelop, gtk#, etc.) in order to experiment with C# programming. Ideally I would like to use the latest version of mono, 2.10; however, F14 repos only carry 2.6.x . Compiling and installing 2.10 from tarballs is causing me dependency troubles which I'm not willing to dedicate much time to. In the meantime, I came across this Novell-hosted rpm repo, which is supposed to be used by RHEL/CentOS users:[URL]. Is it possible to somehow add said repository as an installation source via yum/rpm, or the differences between Fedora and RHEL repositories goes beyond aesthetic differences?
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Apr 5, 2010
*Trying to change some Linux severs timezone from EDT to GMT remotely
*Unable to run "system-config-date" tool from command line
Date:
Mon Apr 5 09:31:10 EDT 2010
cat /etc/sysconfig/clock:
ZONE="America/New_York"
UTC=true
ARC=false
[code].....
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