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0answers
191 views

VMware ESXi RDM Shared Disk and Multipathing

I have set up a RAW mapped storage device which is shared between 3 VMs. In the guest OSs the disk shows up fine but when I try to set up multipathing I can only see one path. In the virtual machine ...
0
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0answers
77 views

Parted does not display partition created in IBM Storwize 3700

My server is running CentOS 6.5. I created a LUN on Storwize 3700 and had named it /dev/mapper/lun1 (I used multipath). And then I created a partition on it and formated it as ext4. When I type ...
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0answers
29 views

TCP Multipath using several SOCKS Proxys as uplink

I would like to set up a server, that uses several SOCKS Proxys as uplink to the internet. All Multipath setups I found were about using "normal" uplink like LAN, Cable or DSL, but none that uses ...
1
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1answer
146 views

9211-8i HBA (IT mode) with Supermicro expander

I have managed to get things to a point that I see all my drives listed with "multipath -l". Now the question is how to add them to a ZFS zpool? All attempts at using dm* naming or /dev/mapper names ...
0
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1answer
45 views

New lun doesnt work well

Actually we have a server with Oracle Linux 5.8 in which we present clones of production LUN and then we open a clone of the database for several querys. The problem begin when we execute this ...
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0answers
130 views

Ubuntu 12.04 multipath boot device with LVM

I'm bootstrapping Ubuntu nodes using cobbler, with a predefined preseed. Due to a bug in Ubuntu: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/959749 it doesn't work too well to install on a ...
5
votes
1answer
184 views

Can SMB3 Multipathing be weighted by policy?

Consider a configuration with two identical WS2012R2 servers. Both have quad-port network boards. Each has one NIC connected to a subnet shared by other servers and ultimately accessible to client ...
1
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2answers
159 views

Number of device listed with multipath -ll

Hope i am not wasting anyone´s time, so apologies to all should that be the case with this question. it is the first time i am playing with multipath, manged to setup multipath on a RHL5, the setup ...
2
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1answer
55 views

Multipath path groups

For native RHEL multipathing, what is the difference between having 2 paths in a single path group as opposed to 2 path groups (with same priority) containing 1 path each? Is one preferable to the ...
4
votes
1answer
595 views

Mounting a disk from SAN (RHEL 5.9)

Storage admin told me he put a 3TB drive on my server from the SAN and I was asked to mount it. The only information I know is that it's on LUN 1 and that the disk is 3TB. Multipath is setup and I ...
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1answer
1k views

Multipath device unpresented to host. How to delete it from LVM and the system?

OS: Red Hat Enterprise Linux AS release 4 Storage people had unpresented a couple of disks previously exported to the system (things that... sometimes happens). Well, there is no problem with this ...
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1answer
2k views

Failure connecting to Dell MD3200i from XenServer 6.2 pool

This question also asked at Citrix Forums http://forums.citrix.com/thread.jspa?threadID=332289 I have a MD3200i that is currently working fine with my Xen5.6 pool, but I cannot get a connection to ...
1
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1answer
491 views

How to make sure RHEL will see multipath disks after a reboot?

We are using RHEL, but unfortunately there are issues with multipathing. It seems not all SAN disks are automatically seen after a reboot. A service multipath reload is required in order for the OS ...
0
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1answer
72 views

MPIO alike multipathing tool for Windows Server [closed]

We are looking for free multipath tool available for Windows Servers alike MPIO. Vendor specific multipath tool like Powerpath for EMC are license based and would like to evaluate different open ...
3
votes
1answer
350 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 ...
1
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0answers
384 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
235 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
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1answer
5k 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
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2answers
2k 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
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2answers
346 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). ...
1
vote
1answer
2k 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
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0answers
133 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
4k 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 ...
2
votes
1answer
675 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 ...
-3
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1answer
1k 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
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1answer
264 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
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0answers
516 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
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1answer
886 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
4k 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
214 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
1k 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
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2answers
338 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
472 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
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3answers
140 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 ...
3
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1answer
1k views

Why does my lvm2 volume group only work with multipath device mapper and not powerpath?

My server is an 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
2k 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
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1answer
260 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
149 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
243 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
554 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 ...
3
votes
2answers
930 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
2k 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
648 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 => ...
6
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3answers
960 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 ...
6
votes
2answers
633 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
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2answers
3k 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 ...
3
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3answers
467 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
1k 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
1k 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
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3answers
4k 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 ...