Photos Getting Corrupt During Copying

atlantic2 · **Joined:** Wed Aug 24, 2005 10:44 am **Posts:** 4

Has anyone else experienced problems with copying large amounts of photos over a small network? Seems anytime I try to copy my photos from an XP workstation to a Win2K Server, about 10 percent of the photos get corrupt to the point where only portions of a photo will appear or the entire photo itself will not show. The file sizes and everything else seems to be good just not viewable. I use explorer to copy and paste but not sure that copying 6000+ photos in explorer may be part of it.

Reason I am asking is I have just installed NasLite+ on another machine to try and correct this problem, and was wondering if anyone else had ran into this before.

uthi · **Joined:** Sat Dec 10, 2005 6:26 am **Posts:** 9

This is a known problem created by WinXP in combination with certain Motherboards and chipsets. Search the Microsoft Knowledge base, they recommend to change the hardware or the operating system!

We lost 5% of our archive server. The hardest thing was, how to find out, which file of our 200.000 files was corrupted ...

Our print shop went bankrupt because of this problem, because they lost all customer data :cry:

uthi

georg · **Posted:** Sat Dec 10, 2005 1:05 pm

I have not yet upgraded to NASLite+. Am still debugging an issue using NASLite. I am getting "DELAYED WRITE FAILED". The symptom is as documented at Microsoft's web site: http://support.microsoft.com/default.aspx?scid=kb;en-us;321733

But of course this problem can't be fixed using MS suggestions since we are writing to a network attached disk with non-MS OS. I am only including the reference above to illustrate the symptom. The system experiencing the DELAYED WRITE Failures is two year old hardware (Intel Mobo with 845 Chipset) running WinXP Pro SP2. And MS claims SP2 already fixes the problem.

I am using a new and modern box for NASLite (Celeron D, 2.93GHz, 533FSB, 512MB RAM, 300GB Maxtor (16MB buffer), MachSpeed MoBo (P4M800)). In general it works great.

So far the errors occur consistently when trying to copy a folder with about a dozen files, several of which are 1GB each in size from the WinXP system to NASLite using Windows Explorer.

After the errors are reported (usually after copy of the first few small files plus the first 1 GB file is APPARENTLY (not sure if I can trust this) completed, and canceling the copy operation on the WinXP system, and re-booting NASLite, NASLite it has to go through one hours worth of "fschk" to repair the errors (due to the 300GB size of the Maxtor).

I am still testing and will post updates as time allows.

Admin · **Posted:** Sat Dec 10, 2005 3:16 pm

Hi georg,

Have you tried another Hard drive in the NAS? to see if its a Cache of the hard drive, From what I have read it seems like a hard drive issue.

Eden

georg · **Posted:** Sat Dec 10, 2005 7:03 pm

Hello Eden,

Thanks for the suggestion ... I was just getting ready to do that. I had also already played around with Cable Select versus Master/Slave, an older (4200 rpm 20GB 2.5" laptop) HDD, etc ... (The laptop drive did not exhibit the error, but there were too many other variables ...)

HOWEVER ... I just dove in and purchased NasLite+ USB. With no other changes (HDD, cables, Master/Slave etc etc) IT NOW WORKS !!!

Too preliminary to tell yet ... I will run more continuous tests ... but so far no more Delayed Write Failures and MUCH MUCH BETTER performance (continuous network utilization around 85-88% in Windows Task Manager on the machine that is the source of those large folders as compared to 70% usage before with long 0% pauses).

Intermediate question though: in NASLite the "System" log had shown cumulative RX and TX bytes transfered. Now in NASLite+ USB those bytes seem to be all over the place (RX 2.3GB; five minutes later 1.0GB, then 32.5MB, etc). All this during these large transfers.

Any idea ??

(BTW: with NASLite (and the Delayed Write Failures) System log showed RX packets with errors, dropped, and overruns. See my post http://www.serverelements.com/phpBB2/viewtopic.php?t=584&highlight=&sid=d8094372f328fffd386b888a8832fd62 All zero so far with NASLite+ after transfer of about 15GB in 3 sub-folders and 35 files total.)

Georg

UPDATE: I just copied (in a single Windows Explorer copy/paste operation) one folder with 33 files in 9 sub-folders, 12.8 GB, with NO ERRORS in 23 minutes (works out to about 9.5 MB/sec (or 76 mega-bits/sec or 76% (not counting protocol overhead) of what the cabling is rated at)). FANTASTIC ! Total copied so far without any further errors in the past hour or so: 27.5 GB.

Admin · **Posted:** Sat Dec 10, 2005 7:56 pm

Hi Georg,

I think purchasing the full version was a good move, 1. you no longer have a 4GB limit on filesize, 2 the networking is faster.
I hope it has solved your problems, With pc's it always a process of elimination and working out what is causing the problem, Due to me never ever having a problem with Naslite I have never had to go and look at the logs, its always just worked.

I just saw your UPDATE whilst writing this and I guess you are happy now, :-)

Oh and another thing georg, on the Naslite+usb disk there is a tools folder here is a kicker disk that will allow you to boot the usb on a non usb booting motherboard.. if you know what i mean. lol

Regards Eden

georg · **Posted:** Sat Dec 10, 2005 8:18 pm

Thanks, Eden ... yes I know what you mean (about the MoBo).

No trouble for me ... USB was initialized and worked right off ... thanks to the modern MoBo ...

I had decided a few weeks ago to put to rest all the trouble with the old Compaq ... for $70 (after Mail-In-Rebate ("MIR")) I purchased a modern Mobo (mini-ATX, built-in video and LAN) with Celeron D 340 (2.93GHz) included; added 512MB for $10

(after MIR) ... all from TigerDirect.com. A new mini-case was on special for $30 (with PSU) at a local small computer store. Voila: $110 and I had a new system. Used the old CD-ROM and floppy from Compaq, and an old Intel socket 478 Heatsink and USB stick just happened to be lying around. Then I bought a new disk (which I am not including in the total expense, since it would have been necessary anyway). Plus $25 for NASLite+USB.

So .... yes $135 has bought some happiness ! And the old Compaq can take on other duties. ( I no longer need the floppy and CD-ROM ... so back they go. )

Back to my question about the RX Byte count: Any ideas why it's not cumulative :?:

Georg

P.S. all $ are US$.

georg · **Posted:** Wed Dec 14, 2005 12:05 am

Regarding the "cumulative byte count" issue. I believe there's a BUG here. I am posting below copies of two consecutive updates from the SYSTEM LOG (unfortunately I did not catch it quite at the right time ... however, the NASLite+USB was not shutdown between the SYSTEM LOG snapshots (even though they are 1.25 days apart but with little NAS activity), and it SEEMS that when lots of activity started again, and with the crossing the 4GB boundary on the "TX Bytes", the BUG shows up.

Some more detail: the "TX packets" count does continue to increase, byt "TX bytes" is probably reset to ZERO after 4GB. A related question is: WHY is the "RX packets" count nearly TWICE the "TX packets" count, whereas the "RX bytes" count is only about one-quarter of the "TX bytes" ? Is the standard byte-size of a TX packet different from an RX packet ?

================================================================

Tony · **Posted:** Wed Dec 14, 2005 11:33 am

Hello georg,

From your email:

Quote:

Please see my comments in the Forum Post entitled "Photos Getting Corrupt During Copying", wherein I repeatedly ask about the "System" log not keeping track correctly of cumulative number of bytes. I have posted some more info after testing to help you DEBUG this issue.

Although not a priority, we'll take a look at that. I suspect it’s a variable scope related issue. The problem is most likely caused by a change in busybox, but until a closer look is possible, that’s just a guess.

Thanks for the note.

georg · **Posted:** Wed Dec 14, 2005 9:35 pm

Thanks. Tony. Yes ... low priority, but something to keep in mind for the next version. BTW, within a few days I'll create a new post ... something like "Wish-List for v1.6" ...

Georg

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Photos Getting Corrupt During Copying

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