similar to: Multipath-root (mpath) problems with CentOS 5

Displaying 20 results from an estimated 5000 matches similar to: "Multipath-root (mpath) problems with CentOS 5"

2007 Dec 14
Qlogic HBA scanning issues with CentOS 5.1 ?
Hi, I got few servers (IBM HS20,HS21 blades, IBM xSeries 3650 & others) connected to a dual fabric san throught Qlogic HBA's (23xx, 24xx). Multipathing is done with device-mapper-multipath. On CentOS 4.x i can scan for new scsi devices without any problems, get them up with multipathing & use them without any problems. However, after i started installing CentOS 5.1 (did not
2008 Jan 31
ISCSI help
I am fairly new to ISCSI and SAN technology but having recently invested in the technology I am trying to find out exactly what can and can not be manipulated, filesystem wise, without requiring a reboot. I am using the inbuilt software ISCSI initiator and multipathing in CentOS 5.1. My steps so far. Create 10GB volume on SAN # iscsiadm -m session -R # fdisk /dev/mapper/mpath0 #
2009 Oct 27
/etc/rc.local and /etc/fstab
Upon system boot, is it ok to mount OCFS2 mounts from /etc/rc.local rather than /etc/fstab ? Are there any downsides to using rc.local that you are aware of? Example /etc/rc.local script: #!/bin/sh # # This script will be executed *after* all the other init scripts. # You can put your own initialization stuff in here if you don''t # want to do
2011 Mar 14
Libvirt with multipath devices and/or FC on NPIV
Hello, I am trying to find out a best practice for a specific scenario. First of all I would like to know what is the proper way to set up multipath, who should care about it the host or the guest. Right now I have a setup where I have one multipath which sets my host to boot from FC SAN. I have another multipathed LUN in the host which is essentially a dm which I attached to a guest, however
2010 May 27
Multipathing with Sun 7310
Dear list, we have a relatively new Sun Storage 7310, where we connect CentOS 5.5 Servers (IBM LS21/LS41 Blades) via Brocade Switches, 4GBit FC. The Blades boot from SAN via qla2xxx, and have no harddisks at all. We want them to use multipathing from the very beginning, so /boot and / are already seen by multipathd. Problem is, that the Sun 7310 has two storage heads which run in
2008 Nov 14
kickstart install on SAN with multipath
Using CentOS 5.1, though with a few hours work I could update to 5.2.. I can install to SAN with a single path no problem but I'd like to be able to use dm-multipath. From the kickstart docs it seems this is supported but there is no information as to what the various options mean
2008 Jun 25
dm-multipath use
Are folks in the Centos community succesfully using device-mapper-multipath? I am looking to deploy it for error handling on our iSCSI setup but there seems to be little traffic about this package on the Centos forums, as far as I can tell, and there seems to be a number of small issues based on my reading the dm-multipath developer lists and related resources. -geoff Geoff Galitz Blankenheim
2013 Nov 07
IBM Storwize V3700 storage - device names
Hello, I have IBM Storwize V3700 storage, connected to 2 IBM x3550 M4 servers via fiber channel. The servers are with QLogic ISP2532-based 8Gb Fibre Channel to PCI Express HBA cards and run Centos 5.10 When I export a volume to the servers, each of them sees the volume twice, i.e /dev/sdb and /dev/sdc, with the same size. Previously I have installed many systems with IBM
2008 Mar 04
Device-mapper-multipath not working correctly with GNBD devices
Hi all, I am trying to configure a failover multipath between 2 GNBD devices. I have a 4 nodes Redhat Cluster Suite (RCS) cluster. 3 of them are used for running services, 1 of them for central storage. In the future I am going to introduce another machine for central storage. The 2 storage machine are going to share/export the same disk. The idea is not to have a single point of
2009 Jan 28
Mount fails with error status -22?
Hi, I am little puzzled. I looked through the mailing list archive and some other sources but doesn''t seem like anything anyone encountered. I have two systems with attached HP SAN. I''m using SLES 10.1 with multipath-tools. When trying to mount OCFS2 device I get this: SERVER:/ # mount.ocfs2 /dev/mapper/mpath0 /mnt/temp/ mount.ocfs2: Invalid
2011 Aug 21
Multipath w/ iscsi
I have several CentOS 6 boxes that mount iscsi based luns and use mpath. They all had problems shutting down as a result of unused maps not getting flushed as the system halted. After examining the init scripts, netfs, iscsi and multipathd all had the correct order but mpath failed to flush these maps and the system waited indefinitely. In the meantime I hacked this by adding a
2009 Feb 25
Mounting mpath devices in RHEL 5
I''m seeing some strange behavior from OCFS2 while trying to mount mpath/dm-multipath devices under RHEL5. Sometimes I can mount the EMC-connected, dual-pathed volumes just fine and sometimes I get "device busy" errors. I''ve tried mounting by label and also by explicit /dev/mapper/mpathXpY name with the same unpredictable behavior. I''ve also
2011 Sep 13
libvirt does not recognize all devices in iscsi and mpath pools in a predictable manner
Hi, I'm using libvirt 0.8.3 on Fedora 14 (as I wrote earlier, I'm having some trouble updating to the newest version), and I'm having problems getting iscsi and mpath storage pools to work in a usable and consistent manner. I have two storage pools defined on the host machine, one for raw iscsi- devices and one for those same iscsi devices device-mapped by multipath. They look
2009 Sep 26
Adding handling for Multipath storage devices
The following patches introduce support for multipath and cciss devices to the ovirt-node and node-image. Comments are appreciated. These patches assume that the 3 patches (2 node, 1 node-image) from Joey are all incorporated. Mike
2016 Sep 03
Ang: Ang: Re: Ang: Ang: Re: Ang: Re: attaching storage pool error
Hi! Report from my multipath tests today. My test virtual machine, that runs from an NPIV pool, is not able to use multipath. When I pulled the cable from one of the targets, it crashed. But, strangely, it could boot up again on that other path, that it just crashed on. That tells me it can use both paths, and is not limited to one of them only, but because the multipath layer isn't
2006 Jun 23
Multipath Routing Problems
Hi all :) there is somekind of strange Routing problem that im getting with Linux-2.6.16 and iproute 2.6.16 , when i use command like : ip route add default nexthop via dev eth0 nexthop via dev eth1 all packets goes on ( always last interface ) , whats is the problem ? this situation also tested with equalize flag , on two physical interface and etc ... -- Lady Luck
2008 Apr 04
ZFS and multipath with iSCSI
We''re currently designing a ZFS fileserver environment with iSCSI based storage (for failover, cost, ease of expansion, and so on). As part of this we would like to use multipathing for extra reliability, and I am not sure how we want to configure it. Our iSCSI backend only supports multiple sessions per target, not multiple connections per session (and my understanding is that the
2011 Jan 21
CentOS and Dell MD3200i / MD3220i iSCSI w/ multipath
We've been wrestling with this for ... rather longer than I'd care to admit. Host / initiator systems are a number of real and virtualized CentOS 5.5 boxes. Storage arrays / targets are Dell MD3220i storage arrays. CentOS is not a Dell-supported configuration, and we've had little helpful advice from Dell. There's been some amount of FUD in that Dell don't seem to
2016 Sep 03
Re: attaching storage pool error
Hi again! Need to add here, since I been investigating a bit further, that it seems to be possible to add an NPIV vhba to the guest, using vdsm hooks. I've seen the reference to "host device assignments", which Dan pointed me too, but I didn't really understand the meaning of it at that moment. It would be interesting to hear from someone that have been doing it, how it would
2008 Feb 26
mapper device perms on reboot
How can I get the mapper device permissions set on reboot? When I attempted to try this... # cat /etc/udev/permissions.d/50-udev.permissions | grep mapper mapper/mpath*:oracle:dba:0660 But it did not seem to work... # ls -l /dev/mapper/mpath* brw-rw---- 1 root disk 253, 2 Feb 26 20:56 /dev/mapper/mpath0 brw-rw---- 1 root disk 253, 5 Feb 26 20:56