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10
votes
2answers
807 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 ...
9
votes
1answer
2k 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* ...
8
votes
2answers
243 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 ...
6
votes
2answers
571 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
977 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
6k 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
380 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
137 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 ...
5
votes
1answer
601 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
895 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
998 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

What is Multipath I/O?

What exactly does "Multipath I/O" mean?
4
votes
1answer
442 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 ...
3
votes
3answers
4k 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
3k 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
3k 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 ...
3
votes
2answers
782 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 ...
3
votes
1answer
288 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 ...
2
votes
5answers
253 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
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 ...
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
613 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
420 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
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 ...
2
votes
1answer
522 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 ...
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
47 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 ...
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, ...
2
votes
3answers
130 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
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 ...
2
votes
1answer
209 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
974 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
258 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
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 ...
1
vote
2answers
125 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 ...
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 ...
1
vote
1answer
334 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 ...
1
vote
1answer
4k 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
436 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
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 ...
1
vote
2answers
2k 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
11k 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
2k 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 ...
1
vote
1answer
200 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
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
110 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 ...
1
vote
1answer
610 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
vote
0answers
328 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
305 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). ...