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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Diagnosing SAN connectivity issues (RHEL5)

We are currently utilizing GFS2 to share a SAN LUN between 3 servers. However due to a feature problem with vendor software we are using, we currently have the volume unmounted on two of the boxes, ...
6
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1answer
568 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 ...
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1k views

Add Windows Server 2008 MPIO futures to Windows 7 [closed]

I have interest issue. I want to work with SAN storage via two Fibre Chanel with using multypath. And I want to use Windows 7 as workstation. Can i add this futures to Windows 7. And how to do this? ...
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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: ...
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2answers
4k views

Mounting LUN from EMC VNX5300 via FC on Centos 6

On my VMX5300, I have created LUNs, configure hosts etc. Mounting LUNs in my ESXi is very simple, ESXi host discovered new FC device and with few clicks I was able to mount new FC storage. On Centos ...
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1answer
341 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 ...
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2answers
112 views

FC SAN network high-error rate simulation

Is there a way to simulate a malfunctioning device or a faulty cable in a FC SAN network? edit: I know shutting down a port on a switch is an option, I'd like to simulate high error rates though. In ...
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2answers
345 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 ...
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1answer
1k 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 ...
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1answer
134 views

What's Fibre Channel? [closed]

i don't understand if the technology 'fibre channel' is something 'software' or something 'hardware' (fibre optics connection) ? Can i create a fibre-channel san using 'some' pieces of existent ...
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1answer
4k 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
1k 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 ...
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3answers
389 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 ...
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2answers
322 views

Can tgtadm serve up FC targets on Emulex / Qlogic HBAs?

I'm trying to discern if 'tgtadm' can be used with mode 'fc'. All the documentation out there tends to point to iSCSI only, though some spots hint at Qlogic FC HBA target mode integration. Would ...
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2answers
305 views

CISCO SNMP map port identifier to physical port

Given the identifier (the id from fcsPortPhyPortNum) and/or WWN of a FC switch port, how can I determine the physical location of the port on the switch (i.e., module 2/port 5 or fc2/5) via SNMP?
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60 views

CISCO SNMP fcIfFLoginTable oid result

Looking at an SNMP walk over 1.3.6.1.4.1.9.9.289.1.1.5.1.3 (enterprise.cisco.ciscoMgmt.ciscoFcFeMIB.ciscoFcFeObjects.cffFcFeConfig.fcIfFLoginTable.fcIfFLoginEntry.fcIfNxPortNodeName) on a CISCO FC ...
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1answer
544 views

Can a backup server HBA be zoned into 2 tape drives without confusing applications?

| tape drive 1 | ---- | switch 1 | ---- hba1 | backup server | hba2 ---- | switch 2 | -----| tape drive 2 | Our backup server has 2 FC HBAs. Each is zoned into a different drive on the back of the ...
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1answer
232 views

I still don't understand FC HBAs and such things [closed]

There is NO documentation out there. The companies don't offer any help on their products, and there aren't text books or anything. I want to set up a storage link between my desktop and my file ...
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1answer
238 views

What is the maximum number of FC switches in a switched star-topology fabric with a 4-domain fabric license on the hub switch?

I have 2 blade chassis, with 2 built-in fibre-channel switches each. And I inherited a "budget" fibre-channel switch with a 4-domain fabric license. I need a reality check, please: When I connect ...
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2answers
3k views

Emulex FC HBA not resetting

A Solaris 11 machine with an oldish Emulex HBA seems to have some problems: # dmesg | egrep emlxs Dec 29 15:31:10 san2 emlxs: [ID 349649 kern.info] [ 5.0608]emlxs1: NOTICE: 730: Link reset. ...
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2answers
1k views

diagnose dell poweredge r210 II not booting with qlogic hba

Dell doesn't "officially" support QLogic HBAs in their cheaper servers like R210 or R310. They support it with R410 upwards. But "official support" is a dubious concept anyway, at least for real men ...
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2answers
97 views

What SFPs can be used with Dell MD36x0f storage?

I've not found any information about used SFPs and supported cable length (which is what I actually want to know). Online configuration wizard does not allow to choose SFP type, only quantity. One ...
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1answer
167 views

Fiber-optic communication: Link length [closed]

I am trying to understand fiber optic communication over long distances: Can optical fibre communication links be used for a length of 100km as well as 100000km without having to change sender and ...
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2answers
3k views

MultiPath configuration on RHEL5 and Clariion CX-300

I have problem with discovering my FC-connected CX-300 storage. Frankly speaking I'm complete novice in FibreChannel, so step by step explanation would be appreciated. My configuration consist of two ...
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3answers
475 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 ...
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0answers
794 views

“Disk volume is write-protected” error when formatting

I have an Infortrend EonStor A16F-G2430 RAID-6 connected to Windows Server 2008 R2 x64 machine via Fiber Channel QLogic 2Gb PCI-X adapter. I am able to initialize the 8.5TB storage as GPT, and able ...
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1answer
340 views

EMC-branded DS24-M2 McData: Where get and what firmware?

I (will) get a EMC Symmetrix DS24-M2 FC Switch which is a branded McData 4500. I'm unsure how/if it's possible to update the box to the latest firmware without an official service contract anymore. ...
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3answers
229 views

Can't set up FC HBA with DHCP

I've got IP over FC working, and have the HBA (QLogic QLA2340) connected to a router with a DHCP server on it. However, whenever I do a: ifconfig fcip0 dhcp start I get: ifconfig: fcip0 wait timed ...
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2answers
183 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 ...
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2answers
3k 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 ...
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197 views

why are FC drives so cheap? or Using Fibre Channel drives as internal storage RAID array [closed]

While looking on Google Product search for drives for a new file server, I noticed that that almost all of the cheapest 300GB 10k drives are Fibre Channel drives: Google Products search result page. ...
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187 views

How to benchmark a fiber storage structure

We have an VMware structure, that uses a couple of physical hosts, a blade chassis and two SAN storages (a Fujitsu DX90 and a Fujitsu Fibrecat SX88). The two physical hosts have most of the LUNs on ...
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2answers
4k views

How to connect an HP StorageWorks 8000 EVA via Fibre to a Windows Server machine for direct storage?

I have two used HP EVA 8000 AD524B drive enclosures with 14 146gb drives in each. They have 2 Fibre controllers in each. I would like to connect these two units to an HP Proliant DL380 G4 server ...
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2answers
1k 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 ...
3
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1answer
824 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 ...
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1answer
191 views

Help identifying and getting started with this Fibre Channel equipment

Some old(?) fiber channel equipment is being donated to my company and I need help identifying what exactly I have, and how to get it up and running if possible. I have two HP rack units, each with ...
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1answer
1k views

what is the latency for an 8K transfer of Fibre Channel? (NFS vs FC) [closed]

I've heard it said that a 512byte data transfer over fibre channel is 10us so would an 8k (16x the data) take 160us? or is much of that 10us one time transmit overhead? I'm interested in comparing ...
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1answer
489 views

XServe Raid with Ubuntu 10.04 problems

I have an Apple XServe RAID connected via fibre channel to a Dell Poweredge R610. This server is mainly for hosting subversion repositories, and storing disk images. In the past 6 months or so we ...
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1answer
1k views

SAN I/O is horrible

I've been testing a SAN with fibre channel disks and I get 500MBPS Writes 200MBPS sequential reads and about 5MBPS randon reads / 1000 IOps max. Any idea why reads are so much slower? It is a 3PAR SAN ...
6
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2answers
405 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 ...
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1answer
302 views

Convert EMC AX150 to iSCSI?

I've to an EMC AX150 SAN, with two FC controllers in it. And no existing FC infrastructure. Since the controller cards seem to be modular (you can get 1 or 2 of them), is it possible to obtain iSCSI ...
2
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2answers
972 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 ...
0
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1answer
503 views

Brocade Fiber Channel switch backups

I am looking for a way to back up my Brocade FC switch configs (including zoning!). Does anyone have commands or automated methods that they use for this?
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1answer
793 views

Interpreting count of zero transmit credits

Our SAN consists of some Brocade 5100 FC-switches, three storage systems and a number of servers. The none of the switches are inter-connected (no inter-switch links). All servers, switches and ...
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3answers
4k views

Should I use the WWN or WWPN when zoning an FC switch?

I'm looking at zoning 2 FC switches which were not zoned when initially implemented for some reason. They are IBM/Brocade switches and I've found this page to be quite helpful. I'm just trying to ...
3
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1answer
935 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 ...
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2answers
2k views

Solaris Fibre Channel target - Configure QLogic QLA2340

I'm currently trying to set up a small storage system as a fibre channel target. This is for testing, so I'm currently using Solaris (Nexenta) and a QLogic QLA2340 HBA. For some reason, the qlc and ...
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 ...
10
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1answer
752 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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5answers
4k 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 ...