On Mon, Jul 6, 2009 at 11:53 AM, Adam Tauno
Williams
On Mon, 2009-07-06 at 08:42 -0700, Lew Wolfgang wrote:
Hi Folks,
<snip>
Fiber channel?
HP Left Hand is now supporting 10 Gbit / iSCSI. I haven't seen actual performance numbers, but it is likely as fast or faster than FC and I believe less expensive.
Although I really suspect that if you tested iSCSI you'd find the bandwidth sufficient (I've just heard the cannot-do-it-due-to-bandwidth allot and found it to be very rarely true).
Totally agree. Especially if you put a 10 Gbit card in the server. Not cheap, but not that expensive. Even if the you use a low cost 1 Gbit/sec iSCSI server like the DroboPro you could use raid to effectively merge multiple of those into a very high performance unit. I have not seen any reviews yet of the DroboPro, so if you buy / benchmark one I'd love to see the perf numbers. It will cost considerably more, but the Dell EqualLogic is highly regarded from what I've seen. You can bind up to 4 1 Gbit nics per shelf I believe, and then use software raid in linux to ramp up to even higher performance.
There is really no way to introduce HSM (hierarchical storage management) into your app?
And Adam throws me a softball. I'm presenting the Open HSM project at OLS next week. Not production ready yet, but I hope it gets there in the next year or less. fyi: I was just an advisor on the project. It was developed by a college grad team as part of a series of competitions. They earned the right to present at OLS and have asked me to do the presentation. Anyway with OHSM you can migrate files / folders between storage tiers without having to change the filepath / name. They have it working with ext2 as a prototype so far. The concept is to build a LVM volume from different PVs that are on different classes of storage. Then you use various policies to move data between the tiers. It still takes time to move it, but that can happen in the background, or at night. And if you just need to access the data for a quick project, you don't even have to move it. So as am example you tell OHSM to move a project directory from a slow storage array up to a higher speed array, and then you can immediately start working with the data, and as you work the data is being moved between the tiers transparently to you. My hope is we can talk the ext4 kernel team to accept ohsm into their mainline code. The ext4 version should be very non-intrusive and just have 4 or 5 small patches required. Of course their will be a separate ohsm kernel module, but being more or less standalone that could even be housed in the OBS for a while. The key is getting those small patches into ext4. Greg -- Greg Freemyer Head of EDD Tape Extraction and Processing team Litigation Triage Solutions Specialist http://www.linkedin.com/in/gregfreemyer Preservation and Forensic processing of Exchange Repositories White Paper - http://www.norcrossgroup.com/forms/whitepapers/tng_whitepaper_fpe.html The Norcross Group The Intersection of Evidence & Technology http://www.norcrossgroup.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org