Questions tagged [multipath-storage]
The multipath-storage tag has no usage guidance.
39
questions
3
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Multipath Duplicate Drives
I am setting up multipaths for Veritas backup on SAN storage. I noticed that lsblk shows duplicate disks, which is quite confusing.
For example, both sdc and sdd represent the same disk, and similarly,...
2
votes
1
answer
53
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With Unified Kernel Images, how are custom initrd scenarios (such as multipath boot) addressed?
I was looking at the Fedora change set for 38 and saw this which seems like a neat idea but I was wondering how this affects systems that need custom files to be present in the initrd. One example is ...
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0
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182
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file system choice pitfalls on 100TB volume
I have an 84 disk powervault storage array, I have configured as a virtual (as opposed to linear) array, with the RAID method as ADAPT (versus linear array of raid-5 or raid-10. One volume spans the ...
- 5,405
0
votes
1
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207
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mounting block device and multipath
I have a storage unit, connected to the host server via scsi cables. There are two controllers on the storage unit, controller-A and controller-B, each with 1 scsi cable connecting it to the host.
...
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0
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2
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2k
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LVM VG/LV is not activated at system startup
I have two multipath devices configured
mpathb (36005076300808b3e9000000000000007) dm-1 IBM,2145
size=16T features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 ...
0
votes
1
answer
46
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Saving Files In Kdenlive to removeable media
I’m having trouble with with my files in Kdenlive.
I can’t find my files through Kdenlive. They just don’t show up.
I have been able to load them into Kdenlive by dragging them into Kdenlive using ...
0
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0
answers
69
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What is the impact of multipath changes?
I have work to do to install new paths in for multipath and I was asked if there could be an outage as a result of my work. I struggled to answer the question. Simply adding new aliases to multipath....
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1
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426
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Multipath resize without LVM
I have a server with a multipath (example) and without LVM. (mpathb -> 5 Tb).
mpathb (360002ac00000000000003af40000af6b) dm-3 3PARdata,VV
size=5.0T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-...
0
votes
0
answers
92
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How to get size of the volume in one line?
I have created kubernetes PVC which is creating volume and mounting into a linux host. I need to fetch the size of the volume.
Currently below is the way i am taking volume name and size.
To get the ...
- 147
0
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1
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59
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RHEL 6.9 HA clustering issue with one node completely down
I have two node servers with SAN storage.
Each node have RHEL 6.9 with HA and the partition are mapped from the storage using fiber cables with clustered resources.
The thing is when the two nodes ...
0
votes
1
answer
81
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Can I configure Multipathig on FC Ports?
I have backup software which is installed on RHEL 7 Server. The connectivity between Data Domain and the Backup Server is as below:
Zonning is configured on switch 1 and switch 2 as below:
Alias For ...
- 167
1
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1
answer
1k
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CentOS 8 - Clustered File System
In my environment, I have a need for a shared disk between two application servers such that changes on Server A are immediately available on Server B. Historically, I have solved this issue by ...
- 1,086
1
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1
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248
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about debian iSCSI target setup
I'm trying to setup TGT-iSCSI on a debian vm (for testing), but when I try to connect from iscsi-client (xenserver, multipath enabled), I can only see 1 IP instead of the 2 IPs prepared for storage (...
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0
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916
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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 ...
- 11
0
votes
1
answer
4k
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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 ...
- 4,122
1
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0
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630
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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 ...
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0
answers
15
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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 ...
- 69
1
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1
answer
5k
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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 ...
- 409
1
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0
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133
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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
- 111
0
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1
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781
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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 ...
- 409
0
votes
2
answers
19k
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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 ...
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0
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197
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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 ...
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0
votes
1
answer
403
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, ...
- 83
4
votes
0
answers
125
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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 ...
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2
votes
0
answers
56
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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 ...
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6
votes
2
answers
3k
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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 ...
- 163
2
votes
0
answers
2k
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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 (...
- 1,258
2
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1
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499
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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 ...
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1
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631
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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 ...
- 133
0
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2
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2k
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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 ...
1
vote
1
answer
565
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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 ...
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1
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1
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2k
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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
#...
0
votes
1
answer
667
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 , ...
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0
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178
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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
...
- 3,362
1
vote
1
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206
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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 ...
- 119
3
votes
1
answer
3k
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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' ...
- 16.6k
6
votes
1
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15k
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"Found duplicate PV"
SERVER:~ # pvs
Found duplicate PV Wb0b2UTCKtpUtSki0k2NnIB24qNj4CEP: using /dev/mapper/36005076304ffc2500000000000004903 not /dev/mapper/36005076304ffc2990000000000004903
PV ...
user90825
1
vote
1
answer
1k
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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 /...
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2
votes
1
answer
2k
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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
...
- 276