Server :: Multipathing Check How The Luns Are Configured
Mar 30, 2011
Multipathing in linux -need to check how the luns are configuredI have no idea about luns configuration in linux environment(newbie) and now i have issue figuring out the configurationSenario,By the look of the multipath output 3 luns are connected to server1 is from Hitachi and 2 from Sunstorage(Thumper)What i am trying to achieve,I need to check how the 3 luns are configured on OS levelI need to differentiate Hitachi and thumper lun The next is to check whether 3 luns are mirrored or not (if not ,how they configured)The third and last .I need to remove the mirroring luns (if exist) and leave the system with only Hitachi lun
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Apr 27, 2011
Is it possible to present multiple LUNs from 1 SAN with 1 NFS server? Currently, my NFS server is directly connected to my FC SAN. Do I have to install and configure multipathing for this to work OR is this just not possible to do over one connection?
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Aug 25, 2010
How to device-mapper multipathing in conjunction with fdisk. I am more of a solaris expert and now trying to grasp linux (red hat). I have a server that I plan to cluster (future assignment) which is attached to a Netapp SAN via emulex LPe11002 HBA. I have 8 paths to the LUN I created and I can see the multipath device (/dev/mapper/mpath1). Below is my multipath.conf file:
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Question 1: When I look at fdisk -l, I can see all 8 paths to the same LUN. Although I partition /dev/mapper/mpath1, I can still see that 7 of the 8 still say "Disk /dev/sdX doesn't contain a valid partition table". I would think that all 8 would have this removed. I execute '/usr/sbin/lpfc/lun_scan all' and it doesn't work. I am looking to clean this up...what should I do? It seems weird to have to do it to all 8 paths!
Question 2: Why does my alias, 'db' not show up under /dev/mappers?
Question 3: Is there a way for fdisk -l to display one lun rather than displaying all 8 paths to the lun?
What is the standard procedure (commands) people execute when adding a new lun to a server with multipathing so it is nice and clean?
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Feb 26, 2010
Greetings Fellow Knights Of The Penguin Clan....!I am having issues with device mapper seeing a 275GB Raid5 Lun from my SAN storage.I'm using IBM 2145 San Volume Controller.I am able to see a 40 GB Raid 10 device though..
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fdisk -l |grep 'dm-*'
Disk /dev/dm-6: 42.9 GB, 42949672960 bytes
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Nov 15, 2010
command to show the luns mapped to redhat enterprise server 6.1 host. And how do i known the WWNN for the FC HBA attach to the host.
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Dec 1, 2010
How can I check if my CentOS server has Apache configured with SSL enabled? I think Apache was installed with the default modules.
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Jul 28, 2011
I've been trying to update Fedora 15 for weeks. I always end up with a transaction error and the update stalls. The error reads: GPG keys listed for RPM Fusion for Fedora Rawhide-free repository are installed but they are not correct for this package. Check that the correct key urls are configured for this repository.
This is far too involved for a linux newbie, I think my only option is to reformat and reinstall. This is so frustrating, there are 250 MB of updates available that I can't access.
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Nov 22, 2010
I've got an older RHEL4 system (2.6.9-34.ELsmp) which I am needing to migrate off of one LUN and onto another. My plan was to simply have the storage team assign me a new LUN and to setup LVM mirroring then remove the origional LUN. My problem is with the new LUN. I had to reboot to get the system to even see it. It now shows up in /proc/scsi/scsi but there is only one new device in /dev and I cannot even open the sd* device.. I can only open the dm-* device.
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Mar 9, 2011
We're trying to take an existing system running multipathed SAN boot disks, duplicate that boot disk to another system volume, and boot a second system up with all the same parts running like the first system (think: cloning the system).However, multipathing is broke on the second system 'm sure I'm forgetting something stupid here after thecloning).Details:We have a freshly installed RHEL6 on IBM PPCThis is a boot off of a SAN volume with two paths. Installation went great - multipathing was auto-detected and used underneath the usual LVMs for the boot volumes. Looks and works great:
Code:
[root@goldimage dev]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
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Oct 15, 2009
Wanting to join my CentOS5.3 to a windows 2003 active directory. Configured kerberos and samba.
Code:
[libdefaults]
default_realm = domain
dns_lookup_realm = false
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Apr 13, 2010
We are running Oracle 10.2.04 RAC on Red Hat Linux 5 and when ever our SAN storage admin created new LUNS we have to reboot the servers so that server can see newly created LUNS. This causing downtime to our application. How we can add LUNS dynamically without rebooting servers. We are using device mapper mulitpath from red hat version 0.4.7-30.el5 and we have QLOGIC HBA's.
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Dec 29, 2010
if I use Linux File server with NFS Configured, Can MAC clients (workstations) access the files on Linux server over the LAN network
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Aug 16, 2011
I have a RedHat box that I have configured, security, audit rules, latest updates, etc. I want to be able to "image" that configuration so I can kick other boxes with that "image", that way no other configuration/updating needs to be done on the newly kicked boxes. What is the best way to accomplish this? To make things more difficult, it would be near to impossible for me to pull any software off the internet for this.
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Apr 25, 2010
Configuring PIII600e, Slackware 12.2, with 2hdd (160Gb each) for Virtual Web,MySQL,PHP,DDNS,SSHd,Mail,ProFTP servers. I have 3 other PCs w/Slackware12.2, 1 XPwindows, and mac laptop on the LAN. Will be putting webpages together on slackware 12.2, XP, and Mac. *Read some where I don't need /home directory on server box, just use /home directory from other slackware box's /home directory- Since only user on server will be Administrator - how does this work? Will i work with Dupral? Does an Admin directory take the place of home? explain the advantages of configuring server box without /home directory and how its done?
Proposed Partitioning Option:
/root 15GB
/swap 2GB
/usr 60GB
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Jul 19, 2011
I just install a new server and I would like to now what are the basics that I should install. It currently has LAMP stuff. Any one know how are the VPS server configured at hostgator.com and similar web hosting platforms.
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Feb 2, 2011
I configured a svn server with apache. But while checking out it give the error as follows:
PHP Code:
It's on suse 10.
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Dec 2, 2010
I googled upto my capability but cant find answer so asking you In one of my apache 2.0.52 machines, we are using worker MPM model. Even if I use 1 start servers, the # of http processes it starts is 5. No matter what value I pass in StartServers, I dont see more than 5-6 http processes
MaxClients 1
ServerLimit 1
ThreadsPerChild 1
StartServers 1
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Feb 16, 2011
I have configured SVN server on suse 10 , My layout is like: multiple projects in a single repository.
I want that the corresponding users of the projects will get email notification on commit in their projects.
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Nov 2, 2010
The /etc/inittab file is configured as the following.
Code:
# vi /etc/inittab
/sbin/getty -l /bin/login /dev/ttyS0 9600 vt100
It always makes the baud rate 9600.How can I make the baud rate be configured automatically according to the terminal's baud rate? Can I?
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Oct 22, 2010
I installed sendmail in my fedora 7 system. i took the advice as provided in this url [url] I started with "Configuring s`endmail"
Then i went with installing MailScanner without going to clamav and spamassasin installation as i don need it.
I just configured my local domain and assigned a my own IP address. But there was nothing mentioned with configuring the port number. So i just went with "netstat -nl" command. And it showed that my IP is lisening on port 53.
I created 2 users for the domain and i sent mail via telnet. The mail entry got entered in maillog file. But i receive multiple unwanted entries that mail is sent from "root" to "root". But i didn't bother about that.
I proceeded with the next step of configuring the two users on thunderbird. I configured with pop3 on port 53 with the localdomain. Now i sent mail from one user to the other. The mail entry got stored in maillog but i couldn't retrieve the mail on my inbox.
But the mail gets stored in /var/mail/<user>
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Aug 17, 2010
I have configured my postfix server to use TLS (STARTTLS) but with no certificates either on server or client. Here are the TLS parameters in main.cf.
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smtpd_tls_security_level = may
# Obsolete, but still supported
#smtpd_use_tls = yes
#smtp_use_tls = yes
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Dec 28, 2010
i have installed centos 5.5 and rhel5 on vmware but i want to use rhel5 as a yum-client of centos 5.5 . but it is not working for me.i have worked on rhel5 with yum already but there was no problem at all.i am using centos 5.5 first time so i want to know whether there is any difference b/w configuring rhel5 and centos5.5?my centos 5.5 yum server file is given below
Code:
[CentOS]
name=client3.example.com
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Dec 27, 2010
I have configured an nfs server like this: #vi /etc/exports /var/ftp/pub*.dell.com(rw,sync)& configured yum server from client yum update is working but by using nfs method if i am trying to mount i am getting this message mount 192.168.0.254:/var/ftp/pub failed,reason given by serverermission denied
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Jun 3, 2010
When I start the vncserver process, I get a message saying "Starting VNC server: no displays configured." I edited the /root/.vnc/xstartup file and changed twm & to say "gnome-session &" (Without quotes). Not sure why I am still seeing this error. It's CentOS 5.4.
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Dec 18, 2010
I have a openvpn server configured and users are using from remote location. I got some errors in the /var/log/messages file as:PHP Code:
Dec 18 16:09:37system openvpn[7221]: x.x.x.x:58983 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
Dec 18 16:09:37 system openvpn[7221]: x.x.x.x:58983 TLS Error: TLS handshake fai
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Nov 3, 2010
I just installed Debian 5.0.4 successfully. I want to use the PC as a File Server with two Drives configured as a RAID 1 device. Everything with the RAID device works fine, the only question I have belogs to the GRUB 0.97 Booloader. I would like to be able to boot my Server even if one of the disks fail or the filesystem containing the OS becomes corrupt, so I configured only the data partitions to be a RAID 1 device, so on the second disk should be a copy of the last stable installation, similar to this guide:[URL]...
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Oct 28, 2010
Does winbindd must run on linux box client on network with samba ldap server configured as PDC.
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Feb 23, 2011
I want to know something: i have a OS based on Debian configured and installed on a machine that controls all the network. Then, I can access it via another machine (with Windows for example) (connected by crossover cable or using a switch) by a web browser where I can do everything, including adding hosts, adding users, configure mail servers, voip, configure domains, etc etc etc..I would like to install Nagios on my server but I would like to monitor the hosts, routers that I have on the network using the Windows machine. How can I do that? Isn't it supposed to access the nagios information only in the machine where it is installed?
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Feb 18, 2010
I added an init script numbered just before bind9 starts, which needs to see the ipv6 link-local address on eth0. Sometimes this address is not configured, yet. In all cases it eventually is configured.
I am unable to find any script that is configuring the ipv6 link-local address (which is in part based on the MAC address). Does anyone know if there is some script or program that is supposed to be doing this, or is it an internal kernel function?
One workaround I am considering is making this init script go into a loop around sleep 1 to keep checking for the ipv6 address. But I'm concerned this might cause some problems. Any suggestions? I don't want to let it move on to start bind9 until the configuration this script does (more ipv6 addresses) is done.
This is on Ubuntu 9.10 server (for which there is not a prefix choice).
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Feb 2, 2011
I want to restrict some site (Social Networking) through my newly configured squid proxy. But It always allow those site How to block those site. My squid.conf file is configured as follow :-
#Recommended minimum configuration:
acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
[coder].....
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