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18 views

File system size different from LV size

I try to build a highly available Red Hat 6.6 cluster. Following is the procedure I followed to create each of 6 shared gfs2 file systems: I first created physical volumes using multipath friendly ...
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0answers
31 views

Linux multipath 1 lun not using all paths other luns OK

A new 50gb lun was added to the rhel5.8 linux server and we did a scan to detect and add. However multipath -ll shows that the 50gb lun is using only 1 path while the old existing luns are on 2 ...
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1answer
109 views

Create file system on multipath volume

I'm completely new to linux admin and file system. Recently we acquired an HP MSA P2000 san. I've setup the disk into a vdisk and created 3 volumes on it. On Centos 7, I've also setup the multipath ...
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0answers
23 views

How to install Debian wheezy on a multipathed Device

I wanted to know how to install the Debian on Multipathed Luns since i did not found any complete Instructions I like to share my way to do it. Press TAB to enter additional settings. Type at the ...
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0answers
35 views

IBM HS22 QLogic SAN

We are trying to install a linux (Centos 6.6, 7.0, Ubuntu 15.04) on an IBM blade HS22 without local disks. The disk is provided by a SAN using two QLogic HBA (we are using multipath). We tried to ...
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0answers
102 views

Windows Server 2012R2 Backup

We have deployed Windows Server 2012R2, which by using the Windows Server Backup was backup on the drives connected from SAN. SAN disks connected through multiple paths using Windows Multipath-IO. ...
1
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1answer
253 views

lvextend: New size (3071999 extents) matches existing size (3071999 extents)

I configured LVM on a 12TB device with 1 partition. I then tried to extend the LVM across a second 12TB device with 1 partition. vgextend worked, but lvextend doesn't see the space on the second ...
0
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1answer
90 views

Multipath configuration is ignoring drives after /dev/sdaa, /dev/sdab, etc

I have a bare metal server running on Softlayer. It has many Consistent Performance iSCSI storage devices attached in a multipath configuration. One of the devices, represented by /dev/sdaa1 and ...
2
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0answers
691 views

XenServer 6.5 iSCSI MPIO with point-to-point links (without a Switch)

I'm doing some experiment with iSCSI MPIO between FreeNAS 9.3 and two XenServer 6.5 hosts. I would like to use iSCSI MPIO to serve as VM storage. Pretty common environment, but without a switch to ...
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0answers
78 views

Does a dead LUN path cause an increase in I/O times on the remaining LUN path(s)?

We use an EMC SAN appliance. There are 2 'paths' from the cluster to the SAN. Today we experienced that one of the LUN paths was 'dead' (as reported in the windows event logs). Presumably the ...
3
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2answers
129 views

FC-Multipath: Which path_selector performs best?

So I learned that since Red Hat 6 it is possible to choose between 3 algorithms for loadbalancing between different paths to my FC-SAN, the default dumb round-robin - and new - queue-length and ...
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0answers
444 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 ...
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0answers
86 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
vote
1answer
240 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
63 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 ...
5
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1answer
310 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 ...
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vote
2answers
300 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
votes
1answer
72 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
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1answer
1k 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
3k 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 ...
1
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1answer
3k 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 ...
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1answer
1k 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
100 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
2answers
475 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 ...
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0answers
534 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
316 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 ...
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1answer
7k 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
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
vote
2answers
402 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
3k 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 ...
2
votes
1answer
6k 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
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1answer
1k 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 ...
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1answer
2k 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
300 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 ...
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0answers
625 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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2answers
1k 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
6k 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, ...
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1answer
253 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 ...
2
votes
1answer
2k 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
476 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
557 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
166 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
votes
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 ...
0
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1answer
160 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
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2answers
268 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
703 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
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2answers
2k 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 ...
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2answers
3k 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
741 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 => ...