The multipath tag has no wiki summary.
10
votes
2answers
730 views
Adding 60TB Storage to an SLES 10 Server
I have to add some archive\staging storage to an SLES 10 Server. The requirement is to present fairly large volumes (9-20TB each approx, 60TB or so in total) that will be used to store archive data ...
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 ...
8
votes
1answer
1k views
Improving SAS multipath to JBOD performance on Linux
I'm trying to optimize a storage setup on some Sun hardware with Linux. Any thoughts would be greatly appreciated.
We have the following hardware:
Sun Blade X6270
2* LSISAS1068E SAS controllers
2* ...
6
votes
2answers
275 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 ...
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 ...
5
votes
5answers
361 views
What is the least expensive way to obtain 1,000s of public IP addresses?
What is the least expensive way to obtain 1,000s of public IP addresses?
I'm needing to serve secure (https) pages for 1,000s of SSL certificates, and need a separate IP address for each SSL cert.
...
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) ...
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 ...
5
votes
3answers
867 views
Why is my MPIO connection to the SAN capped at 1 Gbps when using Linux?
I'm connecting a RHEL5 box to a Dell EqualLogic PS5000X and seeing a maximum of 1 Gbps even while using MPIO with three gigabit NICs.
I have all three interfaces on the PS5000X and three dedicated ...
4
votes
2answers
1k views
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, ...
3
votes
3answers
1k views
Merit and demerits for various Linux fiberchannel multipath options
On our Linux servers, we currently use HPs qla2xxx drivers, because it has multipathing (active/passive) built in.
The are, however, various other options, like Red Hats device-mapper-multipath with ...
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 ...
3
votes
2answers
2k views
Solaris Multipathed I/O - Physically Removing a Disk
I am a Solaris newbie. I have a Solaris 10u8 machine that is running an attached J4400 and some internal drives. We're using multipathed SAS I/O (stmsboot; mpathadm), so the device mount points have ...
2
votes
5answers
240 views
When is storage considered highly-available?
I've read in several places people describing the following configuration as Highly Available:
2 servers (sometimes with multiple HBAs) each connected via multiple SAS cables to one RAID enclosure ...
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 ...
2
votes
1answer
370 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 => ...
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
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 ...
2
votes
1answer
359 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 ...
2
votes
2answers
398 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, ...
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
790 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 ...
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 ...
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 ...
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 ...
2
votes
1answer
484 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 ...
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 ...
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 ...
1
vote
5answers
9k 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 ...
1
vote
1answer
758 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 ...
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 ...
1
vote
1answer
851 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 ...
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 ...
1
vote
1answer
6k 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 ...
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
485 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 ...
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 ...
1
vote
2answers
143 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
169 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 ...
1
vote
0answers
352 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 ...
1
vote
1answer
843 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 ...
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:
...
1
vote
2answers
839 views
Debian and Multipath IO problem
Basically the situation is, I have a box running Debian, the box internally has an Intel SCSI RAID controller which is controlling 2 hard drives in RAID1 mode which is where the OS is installed.
...
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 ...
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 ...
0
votes
1answer
576 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
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 ...
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 ...
