-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Michael, We have seen the same poor performance in transfer speeds with USB thumb drives. We see about 10Mb/min. So 80Mb file can take 8 to 10 minutes to copy off of or write on to the thumb drive. I have put in support ticket to Sun on this issue. Bad news that came out of that is that there is no fix for this nor any time frame given when there might be one. We have had this issue since Sunray server 2.0. In our environment we use Citrix for connecting to our Windows farm and when you try to copy any large file from a thumb drive it will freeze the entire Citrix session for several minutes before Windows will pop up an error and kill the copy/write session. On the Solaris side it will succeed but only with that very poor transfer rate. One thing Sun Engineering told me is even though the DTU says USB 2.0 support (Sunray 2FS) you will not get the 2.0 speeds since the DTU only has a 100Mb network card. But that still doesn't account for the slow speeds we see as well. And it doesn't matter what server the DTU is connected to or network. I get the same rates using my test server connected to its one network hub with no other traffic than my one DTU on it.
Michael Jinks wrote: > Hi List. > > Last fall we replaced all the PC's in the public labs on our campus with > Sun Rays displaying Windows desktops through the Windows Connector in > kiosk mode. All in all things work pretty well, but we consistently get > complaints about poor performance with USB drives. > > I've been trying to get more concrete information before seeking help > with this, but I've had little luck. I can say for sure that the > troubles are real -- copying a few megs from the desktop to the USB > drive or back the other way can take 20 minutes. We've seen some > indication that some USB drives are worse than others, but since people > often don't know the manufacturer or model of their USB drive, it's > tough to say anything more specific, and any drive I've tried has been > far slower than it would be on a desktop. > > Our network folks tell us that the wire isn't saturated and that they > aren't seeing dropped packets on any of the subnets where our DTU's > reside. utcapture begs to differ, but packet drops are usually below > 2%, not the kind of rates I'd expect to really foul up a data transfer, > and the desktop experience itself is generally fine. > > So I guess I should ask, is our experience typical? What sort of data > transfer rates should we expect if things are working optimally? > > Assuming that this is not expected behavior, any thoughts on how to go > about gathering better information? > > Thanks, > --Michael > _______________________________________________ > SunRay-Users mailing list > [email protected] > http://www.filibeto.org/mailman/listinfo/sunray-users - -- C. J. Keist Email: [email protected] UNIX/Network Manager Phone: 970-491-0630 Engineering Network Services Fax: 970-491-5569 College of Engineering, CSU Ft. Collins, CO 80523-1301 All I want is a chance to prove 'Money can't buy happiness' -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJZ8DJA29OFr7C6jcRArewAKDcetnOeRGFZC8dGIzeEOtIMJE0ogCfQ5pq fYd+LoRpAyHXowlZkj/Bmfw= =DLKY -----END PGP SIGNATURE----- _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users
