On 10/11/2010 10:14 PM, drew wymore wrote: > On Mon, Oct 11, 2010 at 10:06 PM, frankhunt<[email protected]> wrote: >> Situation: Client = Vista PC, NTFS file system; Server = CentOS 5.3 >> serving CIFS shares (FYI: neither of these systems are current with all >> the latest patches and updates - customer preference). Client has >> windows open on both systems and attempts to drag and drop files from >> server to local file system. Seems to work on smaller files. Files >> larger than about 3-5MB will stop transferring after about 10% of the >> file and hang. Client times out, complains that it can't see the file >> on the server - the network connection to the server is lost. Cannot >> ping server from client or client from server. Cannot ping the router. >> Run "ifconfig eth0 down"; "ifconfig eth0 up" on the server side and >> the network comes back. Transfer failure is repeatable (usually) >> although sometimes it works. Network is straightforward SOHO type - >> D-Link wireless router, Netgear switches, very light traffic. I do not >> have a topology yet. >> >> Approach: Added my laptop (HP Pavilion dv6/Ubuntu 10.10) as a client >> and the problem persisted. Same symptoms transferring files to/from the >> CentOS system. Transfer would start, hang, time out, the network would >> crash and re-appear after bouncing the network on the server. >> >> Connected the laptop directly to the server with only a Netgear switch >> (no router). File transfers would NOT fail. Could not reproduce the >> problem in this configuration. [aha, he said, it's in the network!] >> >> (but wait) >> >> Replaced server with the laptop, served files to PC via CIFS. We would >> expect the laptop to fail just as the desktop CentOS system did (because >> we think it is a network problem). Wrong - works perfectly. Could not >> reproduce a failure in this configuration. [Aha, he said, it's NOT the >> network] >> >> Now what? >> >> When I left my client this afternoon at 5PM, we were having success by >> using "copy and paste" instead of "drag and drop" on the PC. WHAT? >> Why does this work? We will continue to test this transfer process but >> I don't see why it would make any difference (but hey, it's Windows on >> the client). Have not tried this approach using the Linux laptop as client. >> >> Thoughts: Could be some buggy condition in the server software >> somewhere (I suspect this because the system has not been updated but >> have no real reason). Could be some issue with the CentOS drivers >> interacting with the network components. I'm really saying that I have >> no clue. >> >> Hence this post. >> Looking for ideas, approaches, incantations, spells, band-aids, anything. >> >> Thanks for listening, >> >> -- >> frank hunt >> (L0F) R0B-ZAR1 >> befuddled linux admin >> erstwhile photographer >> hillsboro oregon >> >> _______________________________________________ >> PLUG mailing list >> [email protected] >> http://lists.pdxlinux.org/mailman/listinfo/plug >> > Frank - > > Look at the NIC on the Cent box and see if it starts incrementing > errors, check dmesg etc to see if there is anything obvious logged. > The copy and paste vs drag and drop is weird if the D-Link is in > place. I ran into a similar problem between Windows clients with a > wireless AP in place where one was connected to the AP via G and the > other via N and running wireshark (works on windows and linux woohoo) > and saw the buffers filling up causing the stall. This might be a > worthwhile route to go to ferret out the problem and see if you can > see a difference with the AP in place between drag and drop vs copy > and paste. > > If the AP lets you, maybe check the WLAN interface for errors as well. > > Drew- > Drew, Good ideas - I'll check with my client to see how much detective work he wants me to do. If it is the server NIC, wouldn't I see the problem when directly connected to the client?
I'm thinking that I should: 1 - get every system to the current release and patch level 2 - minimize the network config, then if things work, add pieces one at a time until it breaks 3 - if that doesn't work, introduce liberal amounts of adult beverage -fh -- frank hunt (L0F) R0B-ZAR1 befuddled linux admin erstwhile photographer hillsboro oregon _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
