Unable to write large files to NAS

[Buffoonz]

I am unable to write large files to my NAS (anything that can't transfer in about 5 seconds). I've attempted transfers from three different machines (2 Win7, 1 XP)(wired and wireless). Every time the transfer starts and lasts about 3-5 seconds and then just stops. I get an error message that the NAS is no longer connected. It's not just a CIFS problem as I get this through TFTP as well. I can read from the same NAS with no issues and can transfer files between the windows machines on the same network without issue. I've been using this NAS for about 12 months with no issues until a power failure a couple weeks ago (don't know if this was a coincidence or not). I desperate for some help to determine the cause.

The NAS is only being used as a movie server. I would typically add about 100GB/week to the server with my family constantly streaming movies throughout the house.

I replaced the NIC, the switch, patch cables, fresh install of FreeNAS (8.0.4-RELEASE-p3 & 8.2.0-BETA4) and still have the same issue.
I ran dd if=/dev/zero of=/mnt/MegaTank/junk bs=2m count=4000 with the result of 21.8MB/sec (not great but sufficient)

Current setup:
Platform Pentium Dual-Core CPU E5500 @ 2.80GHz (CPU load never goes above 50%)
Memory 16GB
zpool MegaTank-raidz2 (10 2TB drives) about 58% full
Release 8.2.0-BETA4

 

[Kimba]

Did you try testing the memory with Memtest? Bad memory will cause the symptoms you are describing

 

[Buffoonz]

Just finished the memtest86+. no errors.

 

[paleoN]

Just finished the memtest86+. no errors.

I'd let finish more than 1 pass. Let it run overnight.

I replaced the NIC, the switch, patch cables, fresh install of FreeNAS (8.0.4-RELEASE-p3 & 8.2.0-BETA4) and still have the same issue.

Did you replace the USB drive? If not then try that.

I ran dd if=/dev/zero of=/mnt/MegaTank/junk bs=2m count=4000 with the result of 21.8Mb/sec (not great but sufficient)

If this is running locally I'd actually consider this quite poor. What to you get when you run the normal performance test? From an SSH session as root:

Code:

dd if=/dev/zero of=/mnt/MegaTank/junk2 bs=2048k count=50k

 

[Buffoonz]

*Solved* So I was playing with everything I could think of last night and all of a sudden I got a notification that one of my drives disconnected. No error messages or issues with the pool until last night. So I figured "great another problem to fix". Last night I resilvered with the spare and everything started to work normally. Write speeds are up to 80MB/sec (I just realized my typo above, should have been 21.8MB/sec not Mb...). Don't know yet what failed with the drive (cable, controller card, etc) but I'm back in business.