Native fibre channel using SL cards on ONS 15454.

Greetings,
I normally hang out in the Storage Networking forum but I thought this would be a good spot to ask a question.
We current have a dark fibre connection between our sites and have issues with our Brocade switches (yeah, they should be MDS) with buffer zero problems. We want to add more bandwidth for our ISL's and we have a couple of ONS 15454's hanging around in racks in our datacentres.. I have been looking at the SL cards for the 15454 and would like to know if anyone has had success with them. I need to do synchronous True Copy between the storage at both sites for a new project. We are using async now but that wont be good enough.
Any comments would be welcome.
Stephen

Stephen,
I don't have any SL cards in production, but do have ML cards, and a myriad of TXP/MXP's on MSTP platforms.
I can tell you, the ML card does a decent job with distance extension is turned on. I have a few STS-24's extended across 400-500KM span lengths for TAPE drives across ML cards and see consistently high throughput.
Measured latency across a 70km span was about 600us with an ML card. Pretty close to an equivalent circuit built across a Muxponder.
I would venture to say, the only concern that you may have with synchronous replication is the latency.
Regards,
Tom.

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i'm pasting one reply of mine, please let me know if it helps.
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IM：[email protected]

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00:07.0 ISA bridge [0601]: Intel Corporation 82371AB/EB/MB PIIX4 ISA [8086:7110] (rev 01)
00:07.1 IDE interface [0101]: Intel Corporation 82371AB/EB/MB PIIX4 IDE [8086:7111] (rev 01)
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00:08.0 VGA compatible controller [0300]: Microsoft Corporation Hyper-V virtual VGA [1414:5353]
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Disk /dev/sda: 53.7 GB, 53687091200 bytes
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Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
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/dev/sda1   *           1          64      512000   83 Linux
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hv_utils                7440 0
hv_balloon              9843 0
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version:        3.1
license:        GPL
srcversion:     8BAC864516830DFFF7DC2B1
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alias:          acpi*:VMBUS:*
depends:
intree:         Y
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Clarification on how to use Xserve Raid and Fibre Channel without xsan.

First let me apologize for not responding earlier to your response, I tend to get busy and then forget to check back here.
Tod, the answer to your question is No, only one computer is accessing the xserve raid files at any one time and that is via Fibre Channel. However I do have the xserve raids set up as share points via ethernet.
Maybe I should turn that off and only access the files with the one computer that can connect via fibre channel.
I never thought of that. I will try that while I await for your answer, thanks again.
Todd Buhmiller
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Mac Pro Tower-Quad Core Intel Xeon 2.8Ghz, 16Gb of Ram, Running Snow Leopard 10.6.4
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The directory for the xserve raids keep getting corrup, and I use disc warrior to rebuild them. Is there a way to keep the directories from getting corrupt? I am a few pieces of equipment before I can build an Xsan as that is the ultimate goal, but until then, I just need to be able to have the raids funciton as storage without having to rebuild the directories all of the time.
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Todd Buhmiller
Widescreen Media
Calgary, Alberta Canada
Tod Kuykendall
Posts: 1,237
From: San Diego
Registered: Oct 11, 2000
Re: Xserve Raid Mounts, Corrupt Directory tired of rebuilding directory
Posted: Jun 27, 2010 1:25 PM in response to: Todd Buhmiller
Are multiple computers accessing the same data on the RAID at the same time?
If so then NO. This is the source of your data corruption and I'm surprised if you were able to get all your data back every time if this is how you've been running your system. Each fibre channel assumes it has full and sole control of every volume it has mounted, no data arbitration is practiced and data corruption will occur if this assumption is wrong.
The only way this set-up will work is to use partitions or LUN masks so the volumes are accessed by one computer at any time. As long as one computer relinquishes control before another mounts it you will dodge arbitration issues but this is a dangerous game. If you screw up and mount an already mounted volume - and there is no easy way to tell if a volume is mounted - corruption will then occur. Sharing data simultaneous at fibre speeds is what XSAN does and to do this you need it.
HTH,
=Tod
Intel Xserve, G5 XServes, XRAID, Promise

+The xserve raids will mount automatically to any computer that I connect the qlogic fc switch to+
This is source of the corruption to your data. Any computer that attaches to a drive/partition via fibre channel assumes that it alone is in control of the drive and data corruption is inevitable.
+Is that the issue, should I disconnect the xserve from the fc switch and leave it connected via ethernet?+
Short answer: YES. The ethernet connections are fine because the server is controlling the file arbitration through the sharing protocol. Fibre channel connections assumes complete control over the partition and no arbitration of the file access is performed. It's like two people independently driving trying to drive the same car to different locations.
Depending on your set-up it is possible for the two machines to see and use different parts of the Xserve RAID storage but they cannot access the same areas without SAN doing the arbitration.
Hope that's clear,
=Tod

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I think there is. It is hard to believe that ~200MB/s read comnpared to 0,7MB/s write speeds are a feature rather than a bug/problem.
I haven´t tested the used xserve with another xraid, I used different server for the Xraid benchmarking.
Message was edited by: Janne Ikola

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Get the PCI-X card for the Xserve G5.
The previous post is wrong; the Intel Xserves use a PCI Express card.
NO system uses a standard PCI card anymore. That's old, slow technology. Apple doesn't sell PCI cards... only PCI-X (for Xserve G5) and PCI Express (for Intel Xeon Xserve). Actually the Intel one can use either card, IF you get a PCI-X riser card instead of 2 PCI Express ones.

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Hi all,
I'm attempting to repurpose a first-generation Xserve RAID (with HSSDC2 ports) on an Intel-based Sun machine. My problem is that I need to find a Fibre Channel HBA which has SFP ports.
The first-gen Apple PCI Express card seems to fit the bill:
http://store.apple.com/uk/product/MA900G/A?mco=MTIxODk3Mw
According to several reports online, all Apple FC HBAs are re-branded LSI cards.
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Yes, it is an LSI card.
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DWDM for provide native fibre to another site.

I hear that Cisco are going to offer the 4 and 10 Gbps DWDM SPFs that plug directly into the MDS so I got a bit excited at work discussing this with the network people. They are mucking about with optical test gear right now.
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Regards
Stephen

Hi Tim,
Thanks for your reply. It was most valuable. I discovered another company that provides a product called NeoScale CryptoStor SAN VPN which obviously means that this can be done. Their encryption is not on the same level as what we would need but it has to be a start. The system has limited abilities for throughput considering the speeds that can be achieved.
Regards
Stephen

Native fibre channel using SL cards on ONS 15454.

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