Questions tagged [multipath]
135 questions
2
votes
1 answer
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 (84x12TB 7200rpm) and an additional enclosure…
Nicolas De Jay
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- 11
1
vote
2 answers
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 clients must operate in a multi-address multihoming…
cqcallaw
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1
vote
0 answers
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 iscsi, there are 4 different Ethernet ports which…
Rahul
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1
vote
0 answers
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 IP). I am trying to set up a ECMP(equal cost…
Lophy Liu
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1
vote
1 answer
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
3600000e00d290000002930c300100000p3 253 44 L--w 0 …
Kordi
- 131
- 5
1
vote
1 answer
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 0 0 0
mpathbb ONLINE …
elleciel
- 389
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- 11
1
vote
1 answer
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 package on Redhat 5 is device-mapper-multipath…
saraya
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1
vote
0 answers
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 multipath service and run rescan-scsi-bus but the output…
sherpaurgen
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1
vote
1 answer
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][active]
\_ 1:0:0:11 sdo 8:224 [active][ready]
\_…
finkfink
- 21
- 3
1
vote
1 answer
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][active]
\_ 1:0:0:11 sdo 8:224 [active][ready]
\_…
finkfink
- 21
- 3
1
vote
3 answers
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 size. since it's a multipath, i found there is this…
badbanana
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1
vote
0 answers
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 multipathd or iscsi configuration.
I somehow stumbled…
godzillante
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1
vote
0 answers
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 really Proxmox VE connected into a cluster, all those…
Nikita Kipriyanov
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1
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1 answer
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 less robust to packet reordering than MPTCP…
Tama Yoshi
- 131
- 5
1
vote
2 answers
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 Infiniband can I use the same port for IPoIB traffic…
BeGa
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