4
votes
1answer
218 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 ...
1
vote
0answers
238 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
177 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
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
votes
1answer
752 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
3k 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, ...
0
votes
2answers
267 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
1k 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 ...
8
votes
2answers
235 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
460 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
576 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
1answer
174 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 ...
0
votes
1answer
4k 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
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
385 views

Same hard disk reported twice in Red Hat (SAN and multipath)

I use two Q-Logic HBA's on one server which have access to the same LUN. Red Hat (and gparted also) sees the LUN as two seperate disks (sda, sdb). Is this normal? Thanks!
1
vote
1answer
9k views

How do you “fix” a faulty path in device-mapper-multipath

I have a multipath config that was working but now shows a "faulty" path: [root@nas ~]# multipath -ll sdd: checker msg is "readsector0 checker reports path is down" mpath1 ...
4
votes
2answers
1k views

What is Multipath I/O?

What exactly does "Multipath I/O" mean?
1
vote
5answers
10k views

EMC PowerPath or MultiPath?

We are using a SAN for our datastorage. I recently got the SAN connected to a CentOS 5.3 server by using the EMC PowerPath software along with the Navisphere Agent running on CentOS. However I have ...