DSM-G600, DNS-3xx and NSA-220 Hack Forum

First, a little introduction about the setup. I recently got DNS-321 and set it up with two 1tb WD green drives in RAID-1 mode. I have a gigabit hub to which my two PCs are wired (my router itself is not gigabit). I have a laptop and for the sake of backup, I am using its gigabit ethernet. The two PC's and the laptop all run Win 7 with cygwin installed. I also have a dell mini9 with hackintosh that only has 100mbps ethernet. My hub's model is netgear gs-108 which supports over 9K jumbo frames, and one of my PCs support 9K jumbo frames and my laptop's ethernet adapter supports 4K jumbo frames. I installed fun_plug and selected default packages, but only enabled the ssh daemon (other the default telnet, which I have to yet to disable).

My issues are two fold, first I get speeds of an average 1.5mb/s and sometimes at the most 4.5mb/s, so I am definitely not getting gigabit speeds on any of the 3 devices that have gigabit. But what is more concerning for me right now are the periodic network failures. I am primarily copying over smb using rsync (the cygwin and mac versions) or the windows explorer. The symptom is that sometime during the copy (currently only writes), the DNS-321 stops responding for a few minutes and causes the copy to fail. The first few times, by the time I realized that the copy failed, DNS-321 was already back up and responding, so made me wonder why it failed. But the first time I was able to notice the error immediately, I found that only the top level shares are accessible, while accessing any of their content would just take forever.  I luckily had an ssh session open at that time. The ssh session was still responding and I was able to cd into the raid, but the moment I issues ls, the command hung and it took a few minutes to come back with listing. Almost at the same moment, the smb access also got restored, suggesting that all disk access was hanging. I also tried rsync over ssh, but that too failed the same way. Can anyone help understand what might be causing the failures? Here is the last rsync error that I copied:

rsync: writefd_unbuffered failed to write 4092 bytes to socket [sender]: No child processes (10)
rsync: write failed on "//dns-321/xxx/yyy.zzz": No such file or directory (2)
rsync error: error in file IO (code 11) at /home/lapo/packaging/rsync-3.0.6-1/src/rsync-3.0.6/receiver.c(302) [receiver=3.0.6]
rsync: connection unexpectedly closed (8878 bytes received so far) [sender]
rsync error: error in rsync protocol data stream (code 12) at /home/lapo/packaging/rsync-3.0.6-1/src/rsync-3.0.6/io.c(600) [sender=3.0.6]

Yesterday night, I had to even reset the device using power button, since it stopped responding to even ping (though the leds showed both disk and network activity), but this happened only once so far. I would like to work on making it reliable for my backups before working on the speed issue. Any help is appreciated.

Update: Just to confirm that the network slowness is not inherent, I get steady speeds of about 12mb/s if I copy from one PC to another via network share.

Last edited by irha (2010-07-28 04:28:52)