Questions tagged [multipath]

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ZFS and SAN: issue with data scrubbing

Working as scientists in a corporate environment, we are provided with storage resources from a SAN within an Ubuntu 20.04 virtual machine (Proxmox). The SAN controller is passed directly to the VM (...
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I want to reset a FC_HOST before the multipath tries to mount paths from it

I have an HPE SN1100Q 2port 16G HBA card on my hpe proliant gen10 server which is connected to HPE 3par storage direct attach. And some wierd stuff happening. Im using qla2xxx driver version 10.01.00....
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19 views

Multipath routing on centos adding the second route breaks the first

I have a Centos box with 2 interfaces that have routes to the internet. One 192.168.1.254, the other 192.168.133.11. I can route through 133.11 perfectly OK when it is the only route specified. When I ...
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1 vote
0 answers
121 views

IPv6 multipath routing with configurable weight

With Linux kernel 4.14, when I add IPv6 multipath routes with weights (10 & 30), they are getting added with same weight '1'. IPv4 route does not have this issue. I checked with exact same steps ...
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0 votes
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454 views

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 ...
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1 vote
1 answer
88 views

Using VirtualBox, can I assign per-VM VPN connections/profiles, specifically in order to use different VPNs on different VMs?

I'd like to run two VMs at the same time on the same host, with each VM connected to a different VPN connection. The host OS in question is Ubuntu, but if there is another OS which would do the job, ...
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2 votes
0 answers
429 views

CentOS Multipath using SAS Disks and Multiple Hosts

===========System Design=========== Server A --> 2 PCI LSI HBA Cards Server B --> 2 PCI LSI HBA Cards 8 x SAS Disk Shelf --> Dual SAS Controller 12 Slot Disk Shelf 96 Disks all SAS Seagate ...
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1 vote
0 answers
39 views

Fibre channel multipath

I have a server with two FC adapters connected to Sun 6140 (IBM DS4700) array. One adapter (1) is connected to Cisco MDS switch and that switch connected to both array controllers. Second adapter (2) ...
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41 views

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. ...
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1 vote
1 answer
44 views

Multipath in linux for 2 replicated storage devices

We are trying to have an HA multipath were from 1 server (linux fedoraOS), we connect to 2 different storage devices (HP3Par) that are syncronously replicated. Our idea is that in case one of them ...
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5 votes
3 answers
539 views

"Bad message" with a new SAN using multipath and iSCSI

I'm configuring a new SAN for a set of Ubuntu 18.04-based servers. Each of nodes can mount the ext4 formatted partition fine. Being new to both multipath and iSCSI, I'm not sure if what I'm seeing is ...
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112 views

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 ...
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2 votes
1 answer
616 views

Why does active-active configuration degrade performance compared to failover?

We are setting up the new storage for an HPC compute cluster that we are managing for applied statistics, bioinformatics, and genomics. Configuration We have the main enclosure with a Dell EMC ME4084 (...
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7 votes
2 answers
914 views

Should I bond iSCSI network connections?

I'm setting up some iSCSI storage (Lenovo) along with a physical server running RHEL7. The server has 2 NICs for the main LAN (bonded) and 2 NICs for the iSCSI network. The Lenovo storage has 4 ports ...
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1 vote
2 answers
497 views

How do I specify a preferred source address for IPv6 multihome clients?

My ISP provides an IPv6 prefix delegation but with a dynamic prefix. I want a publicly routed static prefix for some local services, so I also have a Hurricane Electric tunnel set up, which means ...
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-1 votes
1 answer
112 views

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 ...
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1 vote
0 answers
70 views

Scsi Path is failing

I am very new to multipathing concept. I am trying to troubleshoot an issue with multipathing however, I am not sure if it's an issue with multipath configuration. Server is connected to storage over ...
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2 votes
0 answers
401 views

iSCSI Multipath to block device on zfs pool in ubuntu

I have succesfuly set up zfs pool, created block on it , and created iscsi target. The target is visible from esx host and i can us it as datastore. steps i did: zpool create tank raidz2 sdb sdc ...
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1 vote
0 answers
604 views

Multipath routing with linux kernel 4.19

I have the following two devices tun-1 and tun-2. They have the same ip address 21.2.0.3 and the same gateway 21.2.0.1 (each gateway points to a different device/VM, they just happen to have the same ...
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3 votes
1 answer
2k views

Linux multipath: How to configure a single multibus path group

I have just upgraded a functional Ubuntu 16.04 host to 18.04 and am now having issues with multipath. Package versions: * multipath-tools 0.7.4-2ubuntu3 * open-iscsi 2.0.874-5ubuntu2.7 I have a Dell ...
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  • 389
1 vote
1 answer
153 views

centos multipath /dev/mapper dont map partitions

On SERVER1 I have the following output of dmsetup info -C: Name Maj Min Stat Open Targ Event UUID ...
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1 vote
1 answer
724 views

Formatting/creating file system on multipath volume for ZFS on Linux?

I inherited a ZFS on Linux (CentOS) storage pool and I have a faulty multipath device (mpathah) in my pool: raidz3-6 DEGRADED 0 0 0 ... ... mpathba ONLINE ...
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  • 379
0 votes
1 answer
1k views

Multipathing on VMware ESXi is missing

I'm trying to configure a storage multipathing on VMware web client. I'm running the version 6.5.0, build 6765664. The problem is that on my storage section I can't find the option about multipathing. ...
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1 vote
1 answer
40 views

RedHat: MultipathPackage Compatibility

I have an old RedHat5 server I can't upgrade the OS and new san XtremeI/O storage EMC recommended to install device-mapper-multipath 0.4.9-72 as a native multipath package.But the only available ...
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0 votes
1 answer
3k views

Centos 7 - install and mount fc multipath disks

I tried to install multipathing on a Centos 7.5 host following some links like https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/dm_multipath/mpio_components https://www....
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1 vote
0 answers
1k views

How to rescan missing multipathd paths?

I have multipath configured in ubuntu 14 server but strangely the number of path available for each device is different where the 5TB disk have 4 path and 4TB have 3 path. I have reloaded the ...
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1 vote
1 answer
1k views

Why multipath devnode change after reboot?

As I command multipath -ll, the output show like this. ocr3 (149455400000000000000000001000000ca0200000d000000) dm-9 IET,VIRTUAL-DISK [size=980M][features=0][hwhandler=0] \_ round-robin 0 [prio=0][...
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1 vote
1 answer
310 views

How to modify the "dm-*" value?

As I command multipath -ll, the output show like this. ocr3 (149455400000000000000000001000000ca0200000d000000) dm-9 IET,VIRTUAL-DISK [size=980M][features=0][hwhandler=0] \_ round-robin 0 [prio=0][...
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1 vote
3 answers
2k views

resizing partition using multipathd

redhat 6.3 with a multipath xfs partition. i have already increased the LUN and need to reflect the increase in the filesystem. using xfs_growfs will not work yet unless i increased the partition ...
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0 votes
1 answer
243 views

How to fine-tune iscsi-multipath queueing timeout?

I'm tuning the configuration for a multipath iscsi on a Centos 6 server. At the moment I'm using the following parameters for path retry: ... polling_interval 1 no_path_retry 12 ... That means, 'if ...
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5 votes
2 answers
6k views

How to make RAID controller rescan devices

I have the following setup: A single server with two LSI MegaRAID SAS 9380-8e controllers which are both connected to two 60-bay disk shelves while roughly following the design by Edmund White (see ...
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1 vote
0 answers
63 views

Notification on iscsi/multipath failure

I'm running iscsi-initiator combined with multipathd on a CentOS machine. How can I effectively be notified (e.g. via email) when one of the paths goes down? I can't find any suitable option on ...
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0 votes
1 answer
542 views

How to disable disk device user-friendly names in a RHEL 7 kickstart file

We're right now in the process of deploying a set of fibre-channel connected hosts with multipathed root disks. The installation is automated through foreman, so we boot vie PXE and run anaconda with ...
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2 votes
2 answers
422 views

Does changing vmware datastore multipathing policy disrupt connectivity

We have several VMware ESXi hosts accessing multiple datastore stored on a fiber channel SAN. We have found that some of the hosts are still set to "Most recently used" mode for their multipathing ...
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1 vote
0 answers
420 views

Correct filtering of raw devices which are multipath components out of LVM

I have a HP MSA P2000 FC with dual controllers, dual HP SAN switches and a couple of servers with QLogic "ISP2532-based" 8G dual-port cards. Everything is connected "each to each" way. The OS is ...
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1 vote
1 answer
431 views

How does packet reordering occur in MPTCP, and how does it affect performance?

I am trying to understand how MPTCP differentiates itself from "normal" TCP implementations running over multiple paths. Specifically, I want to know whether the best impementations of TCP are really ...
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1 vote
2 answers
600 views

In Infiniband can I use the same port for IPoIB traffic as well as RDMA traffic?

Good day, and my disclaimer that I am no IB expert and have not worked on IB directly yet. My question seems a trivial one, yet I could not find anything in google that answers it. Question: In ...
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3 votes
1 answer
375 views

multipath on iscsi target is it posible?

Is it possible to configure multipath on target iscsi SAN? I configured multipath on vmware iscsi initiator and it's work but bouth flows goes on the one SAN storage port with the IP but is it posible ...
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0 votes
1 answer
376 views

Linux Multipath

We have 3 hosts which are under oracle RAC cluster, recently we have seen lot of multipath path missing on all the 3 hosts and sometimes these hosts reboot automatically. current scenario is on host ...
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0 votes
1 answer
153 views

Seeing Multiple Partition for same LUN

Anyone knows why I am seeing multiple device for the same LUN?I checked with storage team they only exposed 360000970000196801239533036304532 for this server but why I am seeing these many partition(...
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5 votes
2 answers
542 views

only one of two SFP ports reachable on iSCSI SAN

I have a server with HP NC523 dual 10GbE network card and HP MSA1040 storage with dual 10GbE iSCSI-controller. Both ports on NC523 are configured as a bond. The ports on MSA have different IP-...
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7 votes
4 answers
9k views

Fiber multipath fails: Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK

I am trying to copy(~7TB of data using rsync) between two server in same data center in the backend its using EMC VMAX3 After copying ~30-40GB of data multipath start failing Dec 15 01:57:53 test....
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6 votes
2 answers
1k views

SAN, ISCSI and Multipath (MLAG?)

I'm a bit confused regarding the setup of a SAN with ISCSI and multipath. We are upgrading our network to 10Gbit, so there are 2 10Gbit switches that are configured with MLAG for normal ethernet ...
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5 votes
1 answer
2k views

Refresh uuid of physical device

I'm trying to clone a LUN on a server and present it to the same server and am running into UUID oddities. I don't create partitions on the LUN, just create a PV and then LVM on top of that so I can ...
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-1 votes
1 answer
88 views

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 ...
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1 answer
86 views

Fujtisu Eternus DX80 change iSCSI Discovery Reply Mode

I have a configuration mistake in my dx80 and the system is already in production. I have to set "iSCSI Discovery Reply Mode" at "Host Response" configuration to "All - Reply All Ports (Default)". Is ...
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1 vote
2 answers
447 views

ESXI 6.0 u2 multipathing configuration with group by prio

Is it possible to change the path grouping policy of ESXI 6.0 multipathing to group_by_priority? In essence I want to work with the grouping priorities given by a SAN storage. I didnt see any specific ...
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2 votes
1 answer
2k views

open-iscsi initiator on linux does not see the passive side of an active/passive open-e target

I have a Linux server running SLES11 SP4 which uses open-iscsi and multipathing to connect to a LUN that is presented from an Open-E DSS v7 storage cluster with active/passive failover. The Linux ...
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0 votes
0 answers
54 views

No w/s in iostat output even though wMB/s is high

I am trying to format a 2 TB SAN based block device (/dev/mapper/mpathb). Even though, mke2fs has been running since over one hour without completing, iostat -z -x -m 10 output in a separate terminal ...
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2 votes
1 answer
2k views

How do I set up the default route on a Linux router with dual ISP links?

So, here's the situation. I have dual ISP links currently active and working for routing traffic from my network, with a very similar iptables setup to the accepted answer at Load balancing & NAT-...
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