On 12/29/2014 10:21 AM, Dan Ritter wrote:
On Sun, Dec 28, 2014 at 09:08:33PM -0500, Bill Horne wrote:
Thanks for reading this.
I'm setting up a file server, and it's attached to a couple of
"Drobo" Raid boxes (http://www.drobo.com/), type "TD", which have
about 18TB of storage each. They are connected via Thunderbolt 2
cables, and according to a couple of disk-speed measuring apps,
they're sending and receiving in excess of 180 MB/s.
Actual transfer speeds from a fiber-channel controller, however, as
measured by rsync transfers of large files, are only ~2 MB/s. All
suggestions welcome.
It's a Mac Mini, running OS X "Yosemite", with Server v4.1.
Drobo uses ZFS.
Please tell me more: the "Drobo Dashboard" software offered the option
to format them with HFS+, and since it's attached to Mac Mini, I clicked
"OK".
I don't think any of them have FiberChannel interfaces. They
come with Thunderbolt, gig-e, and USB-3, depending.
You are, of course, correct: I was referring to the /source/ of the
files I was copying /onto/ the Drobo, which is a Nexsan SAN with a
fiber-channel connection. It's a Promise controller that has both
Thunderbolt and Fiber connectors.
Also, I don't think any of them are called "TD". Do you mean
"5D"?
Indeed I do, and thanks for pointing that out.
Are the drives re-silvering?
Not AFAICT.
Do you get better results with a straight copy of a file than an
rsync?
No, but I may have found the problem: the Thunderbolt cables were looped
through the Promise Fiber-channel controller, and then through two
Drobos. We have tdmi -> VGA converters on the ends of the chain, to
drive the KVM video switch in our lab, and when I unplugged the VGA
converters, speeds increased dramatically. I'm running a large copy now
to confirm the results.
THANK YOU for your help!
Bill
--
E. William Horne
339-364-8487
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