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Questions tagged [multipath]

135 questions
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Linux Multipath - Can a Host connect to two different SANs?

I may need to power-cycle a SAN and i'm looking to avoid downtime. I have some options to essentially copy live LUNs from one SAN to another. Currently i have a single iSCSI SAN and i connect to it using iscsi (of course) multipathd. I'm considering…
janos erdelyi
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MultiPath configuration on RHEL5 and Clariion CX-300

I have problem with discovering my FC-connected CX-300 storage. Frankly speaking I'm complete novice in FibreChannel, so step by step explanation would be appreciated. My configuration consist of two IBM HS20 blades with RHEL5.4 on board and 2x…
Kamil Z
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How to dismount SAN device - multipath on Ubuntu

I have to disconnect SAN connected thru FibreChannel to Ubuntu. How can i do this? root@fs2:/# umount /srv/media umount: /srv/media: device is busy. (In some cases useful info about processes that use the device is found by lsof(8)…
MadBoy
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LVM issues when adding a newly-carved LUN from a Clariion - pvcreate fails

This seems to be a semi-common issue asked, but I have not yet found a good solution. I try the following: [root@localhost ~]# pvcreate /dev/sdc Can't open /dev/sdc exclusively. Mounted filesystem? This forum post shows the user's solution to have…
warren
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Same hard disk reported twice in Red Hat (SAN and multipath)

I use two Q-Logic HBA's on one server which have access to the same LUN. Red Hat (and gparted also) sees the LUN as two seperate disks (sda, sdb). Is this normal? Thanks!
user28362
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Traffic shaping for multipath routing in OVS

I'm working with OVS and tried multipath routing using group tables like in this link: https://github.com/PSIB0T/Multipath-Routing. It splits traffic to buckets with output is different ports. At first, I thought the traffic would be split into…
Hai Pham
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Non-valid paths in "multipath -ll" output

I see paths that are no longer valid along with valid ones. How do I prevent them showing up in the output. I expect four valid paths. The volume was earlier exported with LUN 13 and later 14 which shows as failed paths in the below output. The…
Hem
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Linux missing lvm

hello so i have a ubuntu hpc cluster and i got a problem with storage whenever i try to access the storage from my compute nodes i cant i keep getting this error mount:mounting 192.168.100.211:/cm/node-installer or /installer_root failed :operation…
Dhamer Nader
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Ubuntu 20.04 Power LTS: How to disable "multipathd" service at boot time, from the petitboot shell?

Setup: I have large number of multipath LUNs from SAN, connected to this system. Most of these LUNs are not formatted for the Linux env and needs to be reformatted before using. The Problem: To work on these newly attached LUNs, I freshly…
hemanth kumar
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How to get iSCSI multipath work on Windows 10 , should I do any adjustment in linux server side?

I have 8x18TB Raid10 mdadm volume on Ubuntu server. When I connect from Windows iSCSI speeds 220MB/sec read 375MB/sec write. I guess it is a iSCSI protocol bottleneck could not improve it. It leaves me multipath. I have 2 nics on both server and…
Gediz GÜRSU
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How to configure linux routing to enable load balance between two interfaces?

I have these interfaces on my linux machine : eth0, vti1 and vti2. vti1 and vti2 were added after I configured libreswan IPSec. Now I want to distribute traffic through both these interfaces equally. How can I configure linux routing to achieve…
himanshu
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What are the best practices for device-mapper multipath?

Background: We are setting up the new storage for an HPC Compute cluster for applied statistics, bioinformatics, and genomics. Contrary to our expectations, an active-active configuration did not improve I/O performance compared to failover under…
Nicolas De Jay
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DM multipath along with local disk

I have one /storage partition which is created from /dev/sdc local disk which is in LVM, now i want to extend it. we have 1 disk free which is a multipath disk over iscsi. can i add this disk in the existing LVM? will there be any issue when server…
snehal s
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Race condition in active/active clusters

DM-Multipath document says that multipathd support active/active clusters with some policies such as round-robin. However, there is some racing problem in this kind of clusters. For example, assume there is a client who is connected to a disk in SAN…
Gozal
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Add Windows Server 2008 MPIO futures to Windows 7

I have interest issue. I want to work with SAN storage via two Fibre Chanel with using multypath. And I want to use Windows 7 as workstation. Can i add this futures to Windows 7. And how to do this? May be I can copy some files from Windows Server…
Aleksandr Makhov
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