I have started using TeraCopy to move things to my unRaid server (4.5). I was hoping to utilize the CRC check to verify post copy, but I seem to be having a LOT of errors, mainly with larger files such as vobs from DVDs. I have tried copying straight to disc shares (different discs) as well as user shares via cache drive and it happens either way. I have tried comparing the crc's and md5s manually from my windows box and get the same differences. Anybody have any ideas about this? I have never noticed a problem playing any of the files I moved previously, but the CRC mismatches concern me.

 

Thanks. And Happy New Year!

Are you using an Nvidia-based chipset for the NIC?

Have you replaced the network cable?

Have you performed memory tests on BOTH systems?

I was running memtest on the Unraid server as I wrote the last message. 75 errors through pass #2. Looks like I found the problem.

 

It's not nforce. Cables are all new but can be changed out if this doesn't work.

 

I have a Getgear GA311 gigabit card in there. Many recommend the Intel. I guess that might be a last try.

 

Thanks.

I was running memtest on the Unraid server as I wrote the last message. 75 errors through pass #2. Looks like I found the problem.

Thanks.

Time to verify the memory timing, voltage, and speed settings.  often time the bios does not set it properly for your specific brand/model memory strips.

 

Joe L.

Joe L, you were dead on. BIOS had 5-5-5-15 which was incorrect. Looked it up and Crucial memory I have should be at 4-4-4-12.  Changed, rebooted and so far 30GB transferred over without a single CRC mismatch.  Transfer speeds seem a tad faster too.

 

Thanks, you saved me time and $50 worth of RAM.

BIOS had 5-5-5-15 which was incorrect. Looked it up and Crucial memory I have should be at 4-4-4-12.

 

That's kind of strange: A 4-4-4-12 capable ram should run just fine at 5-5-5-15 timings.

You'd have a problem if it were the other way around. So, your real problem may still be someplace else.

 

Still, stranger things have been known to happen.

 

 

Yeah, I thought 4-4-4-12 would be faster (it's DDR-800) so it would be fine.    but since changing it, nothing has come back with CRC errors.

 

I'd run a new memory test, preferably overnight, with the new timings, before saying all is good.  You will want to verify the memory voltage too.  If it is wrong, the same types of errors can occur.  Same with clock speed.

 

If the memory test fails, expect lots of un-explained errors and problems.

I ran 4 hours (over 4 passes) of memtest on it already. Not a single error (had 75 errors before after 2 passes). I matched up the voltages when I did the timings. I'll probably do a long run overnight and see if it finds anything, but it seems that the memory may not have liked the settings. May be one of those shrug-your-shoulders kind of moments.

 

It  seems that whenever there is some unusual sporadic error that is difficult to isolate, the memory tends to be involved (atleast from my experience)

I matched up the voltages when I did the timings.

Messed up voltages are more likely to be what was causing the problem.

 

 

I matched up the voltages when I did the timings.

Messed up voltages are more likely to be what was causing the problem.

 

 

 

My BIOS allows for modification of the timings but no voltage modification for RAM. It is an Asus P5GC-MX1333 running a Celeron 430. 2x1GB of Crucial Ballistix RAM.

 

Hopefully the tests will come back fine in the morning.

Just to update,  over 8 hrs of memtest later, not a single error. I guess it was the RAM timings. Thanks to all who helped.