1
vote
2answers
103 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 ...
0
votes
0answers
118 views

Setting up iscsi and determining the scsi ID for multipath

Is there another way to determine the SCSI ID when trying to setup the friendly name in multipath.conf? I executed the command multipath –ll –v2 and didn’t see the new slice we had setup (after ...
2
votes
1answer
199 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
2answers
292 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). ...
0
votes
0answers
101 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 ...
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 ...
1
vote
1answer
415 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 ...
5
votes
3answers
849 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
530 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 ...
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
votes
3answers
3k 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 ...
6
votes
3answers
939 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: ...
0
votes
1answer
5k 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
1answer
2k 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 ...
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 ...
9
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* ...
1
vote
2answers
924 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. ...
1
vote
5answers
11k 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 ...
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 ...