The multipath tag has no wiki summary.
2
votes
0answers
10 views
iSCSI multipath: should I keep all portals configured, even unreachable ones?
Sometimes when you connect to a multipath'ed iSCSI target you will have access to only some of its portals. This is common when the initiator is directly connected to the target's ethernet ports, as ...
0
votes
0answers
66 views
Is it safe to restart multipathd while volumes are being used
Forgive me if this is a completely idiotic question. Trying to reload an updated multipath.conf configuration to attach a new LUN and I need to restart multipathd. Is this a terrible idea if the ...
1
vote
0answers
149 views
How to install Ubuntu Server on SAN Storage with Multipath?
I have HP ProLiant BL35p blades and I want to install Ubuntu Server 12.x on them in order to do virtualization with OpenStack.
The storage is made of HP StorageWorks SAN, which is connected to the ...
2
votes
1answer
116 views
How to configure multipath using Intel X520-SR2 10GB on Oracle Linux 6.2?
I've installed the Intel x520-sr2 Ethernet/Fibre card into a server that has Oracle Linux 6.2 Installed on it. When I boot the server I can go into a QLogic menu (screen has something for Intel on ...
1
vote
1answer
775 views
RHEL 5 How to set mount location of multipath device?
I have a RHEL5 + 3Par FC SAN storage environment and am unsure how to setup a multipathed FC device to mount to particular location like /data. I have the 3Par Implementation guide for RHEL and it ...
2
votes
2answers
399 views
fsck.ext3: Device or resource busy on server with RAID after power outage
I am recovering Dell Poweredge R510 server running Scientific Linux 5.5 after an unexpected power outage. The server was set up by our previous system administrator (I'm a grad student). Upon reboot, ...
1
vote
2answers
144 views
Multipath performing very poorly RHEL/HSV200
I'm running a RHEL 5.5 with multipath@HSV200 storage system.
The disk performance for write is VERY poor comparing to Windows-system counterparts (which are using the same storage and multipath).
...
0
votes
1answer
578 views
How to get multipath working for Ubuntu Server 12.04
I'm working on a project which aims to make use of Ubuntu servers running on enterprise class hardware. In our case that means IBM HS23E blade servers, QLogic 4GB fibre channel extension cards and ...
0
votes
0answers
64 views
multipathd start: error starting uevent listener
How resolve problem:
multipathd start error starting uevent listener
C01-OraDB-02:~ # multipath -ll
3600a0b80006e6a66000040a95066a18b dm-2 IBM,1818 FAStT
[size=100G][features=0][hwhandler=0]
\_ ...
2
votes
1answer
1k views
How do I disable multipath on Linux (RHEL 6) when it is on the root partition (/, /boot, /boot/efi, and swap)?
I have been working on configuring multipath on a couple of RHEL 6 servers. Through some fault of my own (blacklist mistyped) I have configured multipath on the root partition, yet it seems that I am ...
1
vote
1answer
170 views
Can MySQL use multiple data directories on different physical storage devices
I am running MySQL with its data dir on a 128Gb SSD. I am dealing with large datasets (~20Gb) that are loaded and processed weekly, each stored in a separate DB for the purposes of time point ...
0
votes
0answers
109 views
Restarting iscsid on XenServer - will it lose the volume?
I need to adjust some iscsi timeout options in the iscsid.conf (XenServer 6.0.2), but i need to achieve this without loosing the iscsi connection / the volume (so the Virtual machines don't go ...
-3
votes
1answer
322 views
Add Windows Server 2008 MPIO futures to Windows 7 [closed]
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? ...
0
votes
1answer
185 views
Verifying Multipath I/O on Hyper-V (non-Core, Enterprise host with Hyper-V role)
Finding the dialog/menus a bit confusing in comparison to vCenter/VMware. I believe I have Multipath I/O configured (added Multipath I/O role, rebooted, added additional connection under Connections ...
1
vote
0answers
353 views
Newly Resized Luns not Showing correct LUN Size RHel 5.3
My linux servers are not showing their newly resized fibre Luns after being extended on the fly(online).the storage guys have successfully resized the LUNS from 1Tb to 2 Tb .We are running fibre SAN ...
0
votes
1answer
377 views
Howo to get Multipath IO with Dell MD3600i into active/active setup?
I'm desperately trying to improve performance of my SAN connection.
Here's what i have:
[root@xnode1 dell]# multipath -ll
mpath1 (36d4ae520009bd7cc0000030e4fe8230b) dm-2 DELL,MD36xxi
...
3
votes
3answers
2k views
How to best tune Dell PowerVault MD3600i SAN/Initiators for best performance?
Recent owner of a Dell PowerVault MD3600i i'm experiencing some weird results.
I have a dedicated 24x 10GbE Switch (PowerConnect 8024), setup to jumbo frames 9K.
The MD3600 has 2 RAID controllers, ...
1
vote
1answer
158 views
BGP Multipath & return routes
I'm probably a complete n00b concerning serverfault related questions, but our IT department makes a bold statement I wish to verify. I've searched the internet, but can find nothing related to my ...
1
vote
1answer
486 views
Is it possible to create a multipath iSCSI target with two DRBD nodes?
I can put together two linux servers and use the (more or less) new DRBD dual-primary feature to get a shared block device with concurrent read/write access on the two nodes.
Can I then export an ...
0
votes
2answers
193 views
How to block some disks from probes on Linux boot?
My linux host connected to SAN with FC interface.
It connect with one path, and see some luns, that can't access, because they need anohter path, not available to host.
On boot linux probe all lun ...
1
vote
1answer
322 views
Networking / Multipath dropping
I'm having problem with few linux boxes running xen. They are acting as hypervisors and they are connected to SAN using multipath setup to provide storage to guest vms.
Every now and then one of two ...
2
votes
3answers
92 views
Add Multipath to Existing Storage - Ubuntu Server
I have an existing Fiber Channel Storage Array - SGI TP9300 (its an LSI product) it's all set up with LUNS and I have a LVM managing it with two Ubuntu 10.04 servers accessing the array. The Servers ...
2
votes
1answer
485 views
why does my lvm2 volume group only work with multipath device mapper and not powerpath
my server is Oracle Enterprise Linux 5.4 (RHEL5) on an hp blade (x64) with qlogic HBAs connected to an EMC clariion SAN.
we are migrating from multipath to powerpath because emc and the company ...
1
vote
1answer
852 views
vSphere 5/Dell MD3000i multipathing configuration clarification
Revisiting an older vSphere setup with two Dell 1950s, 4 NICs per host:
esxi1 and esxi2 for simplicity sake.
SAN is a Dell MD3000i, two controllers, two NICs per controller:
rc00 and rc01; rc10 ...
2
votes
1answer
221 views
iSCSI aggregation using one switch
Thinking of doing 2Gb aggregated iSCSI between a VM Host and a multi controller iSCSI array. Multipath with two switches is normal for this, but I only have one switch at the moment. But the switch is ...
0
votes
1answer
108 views
multipath storage changes not see between 2 servers with ntfs-3g
I have installed centos 6.2 as virtual host with KVM on servers. Each is connected via SCSI cabling to a HP-MSA500-G2. I've mounted the storage box via multipathd on box machines and both machines can ...
8
votes
2answers
217 views
Can i pause VM's while power-cycling iscsi storage array
Unfortunately I may have to power-cycle my storage array.
In the context of using KVM with libvirt managing the Virtual Machines where i need to power-cycle the storage array, is it possible or even ...
0
votes
1answer
397 views
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 ...
2
votes
1answer
362 views
linux multipath - change device alias safely
I'm running RHEL 5.2 connected to a NetApp over FC. The server is running a database on mpathNN devices that can not be stopped. I need to add a new LUN and give it a specific alias (rather than ...
1
vote
2answers
1k views
Dell PowerVault MD3200i dm-multipath configuration and performance snags in Debian 6.0 (squeeze)
I'll be using this iSCSI target for a couple of Debian-based KVM virtual machine hosts. Each of the target's redundant controllers has 4 ethernet ports; likewise for the initiators. I use two switches ...
2
votes
1answer
373 views
FC multipath says “device busy ” when connecting again. SLES 11 - netapp - emulex
I have a weird issue.
sles 11
emulex FC
netapp fas 2xxx
100G LUN is ok.
Multipath enabled, multipathd and device-mapper seem to work properly.
multipath -t shows this output of the config => ...
5
votes
3answers
568 views
Linux NIC bonding on top of vlan interfaces?
Is it possible to set up bonding(active/backup) on top of existing vlan interfaces ?
Assume the following scenario:
Linux Server with 2 NICs connected to separate switches
iSCSI initiator + MPIO to ...
0
votes
1answer
216 views
how to change path for partition in multipath device [closed]
i have multipath device /dev/dm-2
# multipath -l
mpath0 (3600c0ff00012bb4eed6bd34e01000000) dm-2 HP,P2000 G3 FC
[size=4.4T][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
\_ 3:0:0:0 ...
6
votes
2answers
276 views
Implications of 100% utilization on dm device
We have a RHEL 5.6 server here with 4 active paths to a single LUN. We suspect that it's not able to cram enough IOs down the pipeline to the XIV on the other end:
mpath0 (XXXXXXXXXXXXXXX) dm-9 ...
0
votes
2answers
2k views
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 ...
2
votes
3answers
293 views
Is it possible to multipath across FC and iSCSI?
Perhaps a silly question this one, but I was wondering if it were possible to multipath a storage array across a FC connection and an iSCSI connection? Given that the main point of multipathing seems ...
2
votes
1answer
791 views
Linux Multipath + SAS Array, “device errors” are logged to dmesg for passive paths? Possible to stop this?
I have two OpenSuSE 11.4 hosts connected to an LSI CTS2600 storage array via SAS. Every time I reboot the hosts, I see in dmesg output like
[ 255.942890] end_request: I/O error, dev sdg, sector ...
1
vote
1answer
844 views
Linux-HA + dm-multipath: path removal causes segfault, kernel null pointer dereference, and STONITH
well I am setting up a Linux-HA cluster running
*pacemaker-1.1.5
*openais-1.1.4
*multipath-tools-0.4.9
*OpenSuSE 11.4, kernel 2.6.37
Cluster configuration passed healthcheck by LinBit, so I'm ...
2
votes
3answers
2k views
Linux / Multipath not using all paths, and won't use queue-length path_selector?
I have the following hardware:
2x SuperMicro servers (128GB RAM, 2x 8 core AMDs)
2x/server LSI SAS2008 PCIe MPT-Fusion2 HBAs (2 SAS ports per card)
1x LSI CTS2600 DAS with 24x W.D. 15.7k RPM 600GB ...
1
vote
1answer
156 views
Multipath only sees 2.0T of 4.8T [closed]
I use multipath on 64Bit Ubuntu. If I do multipath -ll it finds my devices, but reports them as 2.0TB instead of the 4.8T they should be. Any idea why this is the case?
Example output:
...
2
votes
2answers
1k views
Multipathd load balancing on md3200i
I'm working on setting up a cluster of servers with an iSCSI MD3200i SAN for shared storage. Everything is working well but I have one small detail I can't seem to get working. Multipath seems to only ...
5
votes
1answer
480 views
Home-grown SAN — topology ideas?
I'm interested in hand-rolling a SAN solution on Linux with the following technologies:
iscsi
mdadm raid
lvm
multipath
xfs/gfs/???
teamed NICs
Hardware-wise, I'm thinking of 2 x gigE (or better) ...
6
votes
3answers
756 views
/dev/disk/by-id/scsi-* links pointing to sdX instead of multipath device
We have two similar SLES10SP2 servers both using multipath on the same devices
from the same storage array.
On one server, the /dev/disk/by-id/scsi-* devices properly point at the
multipath devices:
...
6
votes
2answers
4k views
How to enable multipath I/O for NFS-backed VMware ESXi storage?
Right now I have 3 VMware ESXi hosts using 4Gb fibre channel to our NetApp for storage. I'd like to switch to NFS over 10Gb ethernet.
Each ESXi server has two 10Gb ethernet ports and each controller ...
3
votes
2answers
2k views
Good NFS multipath solution
I have a couple of servers serving exactly the same content through NFS to several webfarms, all the servers involved are running CentOS 5
The content between both NFS servers is replicated using ...
0
votes
1answer
3k views
is multipath -F safe? (flush all unused paths)
from multipath manpage:
-F flush all unused multipath device maps
is this a safe operation? I have a bunch of old dead paths and would like to clear them out, but want to make sure it's ...
2
votes
1answer
1k views
RDAC MPP driver erratic path fail-over errors
In my central syslog I can see a some instances ofo the following error from LSI's RDAC multi-pathing driver for Linux.
[RAIDarray.mpp]MY_NICE_STORAGE_ARRAY:1:0:7 Cmnd-failed try alt ctrl 0. vcmnd SN ...
0
votes
1answer
812 views
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 ...
2
votes
3answers
2k views
lpfc + multipath + ubuntu - path keeps switching
I am having issues configuring multipath using Emulex (lpfc). Although I do not detect data corruption the SAN administrator has a tool that shows that the paths are being switched every 20 seconds or ...
0
votes
1answer
528 views
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?
...
