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Questions tagged [multipath]

132 questions
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1 answer

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* Sun J4400 JBODs with 1 TB disks (24 disks per…
user36825
10
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2 answers

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 (literally, this is for a library) comprising large…
Helvick
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2 answers

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 advisable to : pause the VM's flush and turn…
janos erdelyi
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Should I bond iSCSI network connections?

I'm setting up some iSCSI storage (Lenovo) along with a physical server running RHEL7. The server has 2 NICs for the main LAN (bonded) and 2 NICs for the iSCSI network. The Lenovo storage has 4 ports connected to 2 physical switches. The iSCSI NICs…
frozenhelp
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4 answers

Fiber multipath fails: Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK

I am trying to copy(~7TB of data using rsync) between two server in same data center in the backend its using EMC VMAX3 After copying ~30-40GB of data multipath start failing Dec 15 01:57:53 test.example.com multipathd:…
Prashant Lakhera
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7
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3 answers

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 utilize both NICs (redundancy+throughput) each…
powo
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2 answers

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 IBM,2810XIV [size=1.6T][features=1…
MikeyB
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2 answers

SAN, ISCSI and Multipath (MLAG?)

I'm a bit confused regarding the setup of a SAN with ISCSI and multipath. We are upgrading our network to 10Gbit, so there are 2 10Gbit switches that are configured with MLAG for normal ethernet traffic. LAG groups are made on the appriorate NICs,…
inzanez
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1 answer

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) switches with multiple gigE NICs on both the targets…
Brad
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3 answers

/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: server1:/dev/disk/by-id # ls -l scsi-* | awk…
MikeyB
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2 answers

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 on my NetApp has two 10Gb ethernet ports. The only…
DigiSage
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5
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2 answers

How to make RAID controller rescan devices

I have the following setup: A single server with two LSI MegaRAID SAS 9380-8e controllers which are both connected to two 60-bay disk shelves while roughly following the design by Edmund White (see https://github.com/ewwhite/zfs-ha/wiki). The goal…
Michael
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2 answers

only one of two SFP ports reachable on iSCSI SAN

I have a server with HP NC523 dual 10GbE network card and HP MSA1040 storage with dual 10GbE iSCSI-controller. Both ports on NC523 are configured as a bond. The ports on MSA have different IP-addresses. I want to configure this system to use 20Gb…
Kris_R
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5
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1 answer

Refresh uuid of physical device

I'm trying to clone a LUN on a server and present it to the same server and am running into UUID oddities. I don't create partitions on the LUN, just create a PV and then LVM on top of that so I can grow it online as needed. The cloned LUN has the…
darkside
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3 answers

Can't attach iSCSI with multipathing in Citrix XenServer

Dear people of the world. I have a problem reattaching an iSCSI target on XenServer after a reboot. Whenever I try, I get several errors. Here's me in the attach screen on the redundant storage after it failed to…
Refalm
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