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Questions tagged [multipath]

135 questions
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Linux Multipath

We have 3 hosts which are under oracle RAC cluster, recently we have seen lot of multipath path missing on all the 3 hosts and sometimes these hosts reboot automatically. current scenario is on host 1 all the paths are showing active and ready &…
snehal s
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Seeing Multiple Partition for same LUN

Anyone knows why I am seeing multiple device for the same LUN?I checked with storage team they only exposed 360000970000196801239533036304532 for this server but why I am seeing these many partition(p1..p7) lrwxrwxrwx 1 root root 8 Jan 20…
Prashant Lakhera
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Fujtisu Eternus DX80 change iSCSI Discovery Reply Mode

I have a configuration mistake in my dx80 and the system is already in production. I have to set "iSCSI Discovery Reply Mode" at "Host Response" configuration to "All - Reply All Ports (Default)". Is it safe to change this value in operation, or do…
Snooops
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No w/s in iostat output even though wMB/s is high

I am trying to format a 2 TB SAN based block device (/dev/mapper/mpathb). Even though, mke2fs has been running since over one hour without completing, iostat -z -x -m 10 output in a separate terminal shows a surprising thing: There are no completed…
pdp
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multipathd not working after restarting

Multipathd is not working on CentOS 6.5 x86_64: device-mapper-multipath-libs-0.4.9-87.el6.x86_64 device-mapper-multipath-0.4.9-87.el6.x86_64 I'm getting below error while restarting multipathd service: ux_socket_connect: Connection…
Gaurav Bhatkar
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Backup strategy for LVM file sytem on NFS file server connected to SAN

I have setup a server (CentOS) on which I have connected to several LUNs from a SAN via iSCSI then multipath, resulting in multiple physical volumes I can use for LVM (dm1 ...). From the file server, I have then used these physical volumes to setup…
Vince
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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 /dev/sdab1, is not showing up as a multipath device…
Leo
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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 properties when I select the new (raw mapped lun)…
Cobra Kai Dojo
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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 SOCKS proxys. Has anyone ever done that or can point…
tschanness
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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 command to find the new cloned LUN find…
Juan
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MPIO alike multipathing tool for Windows Server

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 options available from independent vendors.
Kaushik
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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 and see two active connections with Round Robin…
gravyface
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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 [size=5.5T][features=3 queue_if_no_path pg_init_retries…
Disco
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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 he can see, get read error on unaccessible luns,…
Igor Velkov
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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 see the data ( ntfs-3g ). But when I add a file…
Joe Murray
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