Red Hat :: Unable To Get Multipath Configuration LVM / RHEL 5.3

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


preferred_names = [ "^/dev/mpath/", "^/dev/mapper/mpath", "^/dev/[hs]d" ]
filter = [ "a/dev/mapper/mpath.*/","a/dev/cciss/.*/","r/.*/" ]

2- /etc/multipath.conf


#blacklist {
# devnode "*"


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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]


Question: Why OS sees eight ways instead of two? Why do extra ways have such strange LUN (16384, 32768, etc.)?

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Debian Configuration :: Multipath Configuration On 5.0 64 Bit - Doesn't Create The Relative Devices

Jul 20, 2011

i have a HP MSA 2312fc SAN with 2 LUNs configured. The first LUN (LUN ID 1) is correctly connected to the system, but when i connect the second LUN (LUN ID 30), i find in the syslog this message: multipathd: 8:64: size 6835937472, expected 5267578112. Discard

Here is the multipath.conf


So I correctly see the two luns, but multipath doesn't create the relative devices. Under /dev/mapper I see: control mpath0 mpath0-part1 mpath0-part1 is the first lun, the one I mounted in a directory under filesystem. I can't find the device for the second lun

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Mar 8, 2011

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uri ldap://


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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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Jan 28, 2010

Environment: A 32-bit kernel RHEL5.3 system running on a virtual machine. The root(/) filesystem is on an LV.

Issue: Unable to resize the FS after extending the root LV since it is mounted. After extending the LV, online resizing of the FS was not supported and the root filesystem could not be unmounted while it was in use. On rebooting, I got a kernel panic error. In runlevel 1, I couldn't run chroot, couldn't find the /etc/fstab, root FS could not be mounted, fsck did not run (tried block 31 for second copy of superblock using dd count=1 bs=4k skip=31 seek=1 if=/dev/sda2 of=/dev/sda2), couldn't find any rpm on installation media to install unix-utils rpm. On running commands in runlevel 1,

I got the following output.

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Feb 24, 2010

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[vinay@linuxcoe4 fonts]$ ls
100dpi 75dpi encodings misc TTF Type1 util


Also there is no fonts.dir file, which describes fonts under a specific fonts directory in /usr/share/fonts tree. But we can find fonts.dir or fonts.scale file under /usr/share/X11/fonts/ tree. Does files under /usr/share/fonts tree are not dependent on fonts.dir ?

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May 18, 2011

Friends i got an opertunity to configure ddns in my office.I already configured staic dns in linux, but this is the first time iam configuring ddns.I just configured ddns in rhel 5.2 in my office.So far every thing working fine,dhcp is giving ip address to the clients and both forward and reverse dns database is updating.

1) In windows we can use flushdns and registerdns commands to update the dns database, like this any command is in linux to update client details in dns database?

2)how to restrict multiple client entries keeping in dhcp database.

3)if i change client hostname it is not updating the dns database,it is keeping the old one.

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Feb 25, 2010

I have few doubts regarding fonts configuration in RHEL 5.4.

[vinay@linuxcoe4 fonts]$ cd /usr/share/X11/fonts
[vinay@linuxcoe4 fonts]$ ls
100dpi 75dpi encodings misc TTF Type1 util
[vinay@linuxcoe4 fonts]$ cd /usr/share/fonts/


What is the difference between fonts in /usr/share/X11/fonts and /usr/share/fonts

Also there is no fonts.dir file, which describes fonts under a specific fonts directory in /usr/share/fonts tree.

But we can find fonts.dir or fonts.scale file under /usr/share/X11/fonts/ tree. Does files under /usr/share/fonts tree are not dependent on fonts.dir ?

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su.* /var/log/sulog

Then ran /etc/rc.d/init.d/syslog restart (I also ran this prior to editing the syslog.conf file just in case). I'm still not getting any SU log messages.

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My system configuration details are below.
Redhat version : Redhat Enterprise Linux WS release 3 (Taroon update 4)
Driver in SRBC 26:
Nvidia card model : Quadro fx p171
Bios version of Nvidia :
p/n : 900-50171-0400-0000K

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