Questions tagged [multipath-storage]

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6
votes
1answer
13k views

“Found duplicate PV”

SERVER:~ # pvs Found duplicate PV Wb0b2UTCKtpUtSki0k2NnIB24qNj4CEP: using /dev/mapper/36005076304ffc2500000000000004903 not /dev/mapper/36005076304ffc2990000000000004903 PV ...
5
votes
2answers
969 views

Understanding multipath and mountpoints

I was just introduced to multipathing in our production environment and had never heard of the concept prior. After some digging I think I'm starting to get a handle on how the concept works in theory ...
4
votes
0answers
101 views

What identifier is used by multipath to determine the same block devices?

In my application I want to multipath different devices, both local and iSCSI or FC exported. However, I fail to google the documentation that would clearly explain the mechanism of decision that ...
3
votes
1answer
2k views

Does dm-multipath schedule I/O?

I have a multipath device I'm interested in: [root@xxx dm-7]# multipath -ll mpathf mpathf (3600601609f013300227e5b5b3790e411) dm-7 DGC,VRAID size=3.0T features='1 queue_if_no_path' hwhandler='1 alua' ...
2
votes
1answer
360 views

gnu make, vpath, extra o file directory, confusion

I am trying to built two different libraries from fortran source code, one with OMP support, the other without. Thus %.o files from the same source differ dependent on the compiler flags. When ...
2
votes
1answer
2k views

Multipath to a logical volume in a staging VM

How do I configure multipath in testing VM (purpose is purely academical)? I made new logical volume, modified multipath.conf to be as follows: defaults { udev_dir /dev ...
2
votes
0answers
43 views

Multipath — Ignoring internal disks

I want to configure multipath such that it ignores all the internal disks and only sees SAN Luns. Any idea how can I achieve that? Basically I want to filter out all the internal disks like IDE, SAS ...
2
votes
0answers
689 views

Unable to resize filesystem on multipath device

I've encountered an issue with multipath storage. I've resized a LUN and have rescanned the system to account for it. Multipath recognizes the new size. Before rescan: mpathax (...
2
votes
1answer
353 views

Difference between multipath -ll command and multipath -l command

From the multipath man page http://linux.die.net/man/8/multipath multipath -l shows the current multipath topology from information fetched in sysfs and the device mapper while multipath -ll shows ...
1
vote
1answer
1k views

RHEL 5 Booting from Local Hardisk & SAN Harddisk via grub

I had a RHEL machine booting from local disk. Later I removed local disk & booted from a SAN disk and installed RHEL on it. Now I have read about a grub.conf file: root (hd0,0) kernel /...
1
vote
1answer
830 views

Script to Create multipath.conf Alias

I found a script to create alias for multipath for Nimble volumes and I modified it to work in freenas the content of it is #/bin/bash # This script will scan the system for attached Nimble Volumes #...
1
vote
1answer
165 views

Installing Geant4 alongside GEANT-3, and Root 6 alongside Root 5

Can I install Geant4 alongside GEANT-3 on my Ubuntu 15.04 (Vivid Vervet)? I have already installed GEANT-3 by the AliRoot installation method shown by Dario Berzano. How can I install Geant4 without ...
1
vote
0answers
45 views

How to explain the different behavior of multipath -ll with the same write-protected disks ?

The following disks with write-protected for DR usage in RHEL 5.5 have some strange phenomena with the multipath -ll ! 1) Why sometimes the output takes abnormally longer time, versus sometimes ...
1
vote
0answers
10 views

How to ensure if multipath discovery is complete?

On my machine, the multipath discovery takes random amount of time to discover and map all the disks under /dev/mapper directory. The number of disks to be discovered is not constant. How to ensure ...
1
vote
0answers
43 views

multipath equivalent that doesn't require root privilege

Is there any native tool that can show multipath topology but doesn't need root privileges? Basically the same output as multipath -ll
1
vote
0answers
75 views

Why does the node (multipathed with boot drive on mpatha) require both the TGT servers to boot up and not anyone of them

This is what I have done I have a VM which contains: A Ceph client A TGT server DHCP server the machine exposes the image (RHEL) present in Ceph and PXE boots the remote node (which is the ...
1
vote
0answers
112 views

multipath default grouping policy not observed?

RHEL 6.4, Yes I know it's old. I have no choice. According to the multipath.conf man page, the default grouping policy is multibus. That is, multipaths should be shown as follows: # multipath -ll ...
0
votes
1answer
72 views

Proper way to activate LVM partition on multipath during the boot

I have Debian 9 with successfully configured iSCSI and multipath: # multipath -ll /dev/mapper/mpathb mpathb (222c60001556480c6) dm-2 Promise,Vess R2600xi size=10T features='1 ...
0
votes
1answer
127 views

Can one force multipath?

Imagine I have a number of block devices, that I know are the same device but who have different identificators (it may be a device cut and clued with dmsetup, exported multiple times through iSCSI, ...
0
votes
2answers
11k views

Device /dev/mapper/mpathb1 excluded by a filter

On CentOS 7 trying to create physical volume using mpath device. But it throwing this error message. How to resolve this issues? pvcreate /dev/mapper/mpathb1 Device /dev/mapper/mpathb1 excluded ...
0
votes
1answer
441 views

Linux and iscsi multipath

My goal is to make,for testing purpose a multipath lvm iscsi I have setup two debian iscsi server,workings I have setup the multipath on a debian client and i can create dirs,etc on ext4 fs. But if ...
0
votes
1answer
464 views

List connected clients to an iscsi target

Is there any way to list the connected clients to an ISCSI target from another client. While sitting on the target itself , it may be easier to see which clients have mounted a particular target , ...
0
votes
0answers
28 views

multipathd checker failed

There are 2 LUNs from different storage (HITACHI, HP MSA 2040) to my server (HP DL380 G9). and I 'JUST' got this error every day on my LUN that presented from HP storage and on my same PATH (Just on ...
0
votes
0answers
32 views

Extending a multipath'd /dev/mapper device that isn't listed as an LVM anywhere

RHEL 5. I have a host that uses an EQL array for storage with multipath on the OS. I'm trying to extend the disk: /dev/mapper/prdbkpp1 1.3T 1.3T 20G 99% /backup I rescanned and resized via ...
0
votes
0answers
25 views

lsblk output changes after while

I have systems which lots of different LUNs are attached them (OS CentOs 6). this command lsblk helps me alot to find out how LUNs are partitioned and are mounted to which filesystem and information ...
0
votes
1answer
701 views

Dealing with Device-Mapper (Multipath) Failing paths

When a disk starts to die slowly multipath starts to Failing & Reinstating paths and this keeps forever.. (I'm using LSI-3008HBA card with SAS-JBOD not FC-Network) Dmesg; Sep 13 11:20:17 DEV2 ...
0
votes
1answer
185 views

Multipathd config for LSI HBA 3008

I have 5 jbod attached via LSI-SAS3008 to controller. I'm using Arch-Linux 4.14.41-1-lts & multipath-tools v0.7.6 (03/10,2018) My problem is when a disk starts to give I/O error and starts to ...
0
votes
2answers
614 views

Can't mount a multipath LUN

I'm trying to mount a lun, it's visible in multipath -ll and I can see the multiple access to it with lsblk. I know screw up somewhere along the line because sda isn't visibly mounted in lsblk anymore ...