Fibre-channel is a communications protocol widely used in storage networks. It's most widely deployed in enterprise SAN environments, where large amounts of storage need to be shared amongst a number of different hosts, potentially over longer distances. The protocol is primarily used over fibre ...

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5k views

How should I set up my Fibre Channel (FC) network?

How do FC switches work, and how should I configure mine?
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1answer
769 views

Checking fiber cables for light without risking my eyes

I do storage, so I do a lot of fiber. I am also unlucky enough to have a patch panel with single strands, so when someone else does patching for me, it's usually a mystery which of the two strands I'm ...
10
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1answer
788 views

Correct placement of devices on a Fibre Channel fabric

We're getting a pair of new 8Gb switches for our fibre channel fabric. This is a Good Thing since we're running out of ports in our primary datacenter, and it'll allow us to have at least one 8Gb ISL ...
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2answers
1k views

How Fibre Channel Frames are populated and traverse a Fabric?

Trying to wrap my head around how Fibre Channel Frames are actually populated and sent through a switched fabric. I Understand WWNN WWPN, WWNN is a WWN of the actual HBA, and WWPN are the WWN of the ...
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2answers
30k views

Fibre Channel LUN rescan and QLogic

I have a serious problem with a SAN storage array connected to a Linux box through Fibre Channel. Here is the configuration : Debian with plain vanilla linux 2.6.27.25 Fibre controller QLogic 4Gb ...
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16answers
6k views

Cheap but Highly Available Shared Storage? [closed]

my group is in the market for plentiful storage. We traditionally used big-iron FC-attached SANs, but they are way expensive and provide much more performance than we require. We want highly ...
7
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1answer
845 views

VMWare ESX and guest settings for Netapp cluster failover

If I'm running VMWare 5.x on FC [edit] LUNs presented from a Netapp running ontap 8.x in 7 mode, what steps should I take to ensure that the VMs can withstand a worst possible case cluster node ...
6
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2answers
2k views

Is 10Gbps fiber (aqua or teal clad) backwards compatible with 4Gbps/8Gbps (normally orange clad fiber) FC equipment?

Just like the subject says. I've got a mess of FC hardware in a rack that I'd like to replace the cabling on. Looking at Monoprice I see that LC/LC cables are really close in price between 10Gb and ...
6
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1answer
712 views

FCoE, on any Ethernet switch?

I understand the concept of FCoE. I have looked at the Wikipedia page and looking at the layer 2 frame diagram, it looks like FCoE really should "just work" on any Ethernet switch, but is this really ...
6
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2answers
438 views

Fibre channel zoning by port: bad idea?

I have a single FC switch here that has a bunch of servers hanging off of it. Currently it is zoned (as per my previous question, Fibre Channel zoning best practices) by WWN, one zone for each pair ...
6
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1answer
2k views

Which events specifically cause Windows 2008 to mark a SAN volume offline?

I am searching for specific criteria/events that will cause Windows 2008 to mark a SAN volume as offline in disk management, even though it is connected to that SAN volume via FC or iSCSI. Microsoft ...
6
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1answer
1k views

fibre channel debian problem

I have a QLogic Fibre Channel card installed in a Debian box (Lenny), and after some tiffs with the firmware, I managed to get the operating system to recognize the card (DKMS driver, and the ...
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2answers
4k views

How do I set up IP over FC?

I have 2 systems, with a Broadcom BCM5701 and a LSI7202p, of which are connected with a LC->SC cable. The cards are properly detected in Linux, however I wish to set up IP over FC. I've read online ...
5
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5answers
734 views

Fiber in Cable Management Arm

I'm aware of the existing debate on cable management arms. For those people who DO use cable management arms, do you put Fiber into the arms? It looks like I'm fine on minimum bend radii, but am ...
5
votes
1answer
3k views

Switch Netapp expansion FC port from target to initiator

I have a v3200 with a 4 port FC expansion card. I am trying to switch one (or all, doesn't matter) of those ports from target to initiator. When I execute fcadmin config, I get: ...
5
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3answers
440 views

Brocade mirror ports

I'm getting a bunch of brand new condor 3 based switches and these things have a feature I'd like to use called port mirroring. Essentially, a mirror port can be configured to show all traffic being ...
5
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2answers
183 views

Storage issue - 360 VMs unresponsive

We recently had a fibre channel storage issue (looks like it was a single bad cable) that affected all 360 VMs in 2 clusters attached to the same storage virtualisation device - IBM SVC 2145. The VMs ...
4
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2answers
2k views

What is Multipath I/O?

What exactly does "Multipath I/O" mean?
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7answers
1k views

Rough estimate for speed advantage of SAN-via-fibre to san-via-iSCSI when using VMware vSphere

We are in the process of setting up two virtualization servers (DELL R710, Dual Quadcore Xeon CPUs at 2.3 Ghz, 48 GB RAM) for VMware VSphere with storage on a SAN (DELL Powervault MD3000i, 10x 500 GB ...
4
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1answer
327 views

Can someone explain the important differences between fabric, point to point, and loop on a fibre san?

I have a fully redundant HP 8/20q FC SAN that has been working well, but as I dig deeper into things looking for more performance, I'm quickly at the end of my knowledge when it comes to FC ...
4
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1answer
335 views

Is IP over FC still crazy complex? [closed]

In the link below, it is explained that 4 years ago IP over FC was crazy complex: How do I set up IP over FC? Is that still the case on CentOS 6?
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1answer
421 views

Brocade ISL port monitoring

I have a pair of Brocade switches with ISLs running between them. I'd like to know if it's possible to be alerted when one of the ISL ports goes from an E_PORT to anything else (particularly a ...
4
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2answers
5k views

Understanding Linux SCSI queue depths

I'm experimenting with the effects of different SCSI queue depth values on a Dell server running CentOS Linux 5.4 (x86_64). The server has two QLogic QLE2560 FC HBAs connected via multipathing to a ...
4
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1answer
582 views

Cisco FC SAN switch decision

I've got to buy a bunch of FC SAN switches in the next week or so, I have to, and want to, buy Cisco MDSs. Servers are HP BL490c G6's in C7000 chassis with Virtual-Connect Flex-10 ethernet ...
4
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1answer
155 views

UCS FC Adapter Aborts

So here's the scenario, and I'm hoping @Chopper3 can chime in here. For our SAN fabric, we have a pair of Cisco MDS 9513 FC switches with three EMC frames and four Cisco UCS domains directly attached. ...
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2answers
3k views

Is it possible to use Linux as a Fibre Channel Raid Disk Box?

You probably all know the relatively simple RAID boxes exporting a bunch of SATA disks as one big drive via FC, SAS or iSCSI, like the HP StorageWorks MSA2000, Infortrends EonStore series or many ...
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1answer
2k views

Fiber Channel Loop vs Point to Point

So, I'm playing with a couple of QLogic QLA2340s connected directly together. I've got options here to either have them act as a loop, or in point to point mode. What's the difference if I'm only ...
3
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3answers
3k views

Which OS can work as a fiber-channel target?

Just for the research, which OS can work from the box or with some 3rd-party software as a fc-target? I know only the following: Solaris (currently only OpenSolaris+COMSTAR), Windows Storage Server. ...
3
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2answers
210 views

What is a proper procedure for unplugging fiber chanel from ESXi

In my DC admins have to unplug my FC connection from ESXi5 (from EMC VNX) (temporary, some maintance works). I have never done that before and have some doubt about my own procedure... My first ...
3
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1answer
81 views

Is it possible to connect a FC HBA 8 Gb through 10 Gb Ethernet SFP+?

I have to connect an IBM Server with a QLogic EP2532 to an IBM DS3512 with a PMC PM8032. I need two 8 Gb FC LX 1310 nm SFP+ modules and since they seem to be hard to get, I thought would it be ...
3
votes
3answers
580 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 ...
3
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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
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1answer
187 views

Are FC and SAS DAS devices standard enough?

Before I ask my questions, here is some background info that may or may not be useful: For the first time I find myself needing a DAS solution. My priority is data through-put in a single direction. ...
3
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1answer
1k views

Fibre Channel zoning best practices

I'm hoping that this will be useful for more people than just me. Right now I've got a fibre channel switch, a NetApp filer, and some servers running Oracle. All of the servers can see the same LUNs ...
3
votes
1answer
865 views

ESX shut down VMs when some but not all storage paths failed

I've been on hold now for an hour waiting for VMware support and am betting serverfault can beat them to the answer! I am running ESX 4.0 and 4.1 on 6 HP blades, using FibreChannel LUN storage. We ...
3
votes
2answers
94 views

FC-Multipath: Which path_selector performs best?

So I learned that since Red Hat 6 it is possible to choose between 3 algorithms for loadbalancing between different paths to my FC-SAN, the default dumb round-robin - and new - queue-length and ...
3
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1answer
241 views

Can't Repair SR in XenCenter

I've added in a 4th host to my Xen 6.2 cluster and I'm unable to get it to successfully attach to my existing storage repositories. I'm using 3 older IBM hosts and the 4th new one which is CPU masked ...
3
votes
1answer
987 views

COMSTAR and ZFS zvol giving bursty write pattern

I've just built a small NAS/SAN box and am doing some testing with it. Configuration is: 2GB RAM 2x Opteron 265s Iwill DK8N 5x500GB SATA drives (1 spare, rest mirrored) = 1TB usable space Emulex ...
3
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2answers
2k views

IBM XIV (Storage Array) - Anyone?

Is anyone here using the IBM XIV storage array? Anything you would like to share of your experience so far? We're evaluating an HP EVA along with the XIV which is very different (using commodity ...
3
votes
2answers
102 views

Is a DCB switch required for a FCoE setup?

I'm looking to play around with a test Fibre Channel over Ethernet (FCoE) deployment between 2 Xen servers and 1 storage server. Eventually I plan to replace our ageing NFS shared storage solution. ...
2
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5answers
5k views

Building cheap SAN

Note: Some of you may ask, why not just use a cheap hardware solution. The solution is not so cheap in the country it has to be installed in, with as much as 100% import tax on high end ...
2
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4answers
4k views

Using SAN Fiber Channel network for TCP/IP, possible?

I would like to know if it is possible to use the FC-switch (that is used for a SAN) also for TCP/IP traffic. We have servers (virtual machines) that must have a fast network for copying much data. ...
2
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4answers
122 views

SAN newbie: Using a server like an ISCSI gateway for a purely FC SAN device

I am very new to SANs and have inherited an old EMC CX300 to play with. The CX300 is purely FC, but I'd like to experiment with ISCSI as well without having to purchase an expensive ISCSI gateway ...
2
votes
2answers
417 views

ip over fiber channel for faster LAN

Is it possible to set up a fast LAN using HBA's and a fibre switch? I have a brocade 200e and several emulex LP1150 pcie 4GB cards. Information regarding IP over fiber channel is difficult to find. I ...
2
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3answers
462 views

HBA directly to DAE bypassing SPE

Is it possible to setup a server with a host-based adapter (HBA) directly to a Dell/EMC CX3-40f disk-array enclosure (DAE) which only has fiber connections, taking the storage-processor out of the ...
2
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2answers
189 views

Reset/reuse linux device letters?

Is there a way to tell the OS that /dev/sdd is really gone when I disconnect it and that it can reuse that letter? I have RAIDs hooked up through fibre channel. I have it set up so that fstab will ...
2
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1answer
159 views

Will ESXi 5.5 in standalone mode (free) support fibre channel SAN?

I have a HP blade in a C7000 enclosure and a new 3PAR StoreServ 7200 over Fibre Channel. Today we use DAS and have not virtualized our SQL servers. My goal is: SQL Server 2008 -> WS2012R2 -> ESXi 5.5 ...
2
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2answers
6k views

How to check the current queue depth value?

I have an OEL server connected via fibre to a NetApp SAN. How can I view the queue depth as the OS sees it? Output from lspci: 05:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel ...
2
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1answer
2k views

Best practices for adding 2nd FC switch to fabric on in-production environment?

I have a single Brocade Silkworm 200e switch in production right now. The corp exchange server and 3 ESX 3.5 hosts are connected to the clariion cx3 array through it. Port 0,1 are SPA0 and 1, and ...
2
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2answers
1k views

How to set up an Infiniband SRP Target?

I want to set up a server as a SCSI Target. How good are the open source implementations? What is the tutorial one? How is performance and reliability? How dependent is the OS? How much is ...