Sudden low disk speed

[huberte]

Suddenly my disk speed is almost like a BBS speed :(

did

Code:

dd if=/dev/ad0 of=/dev/null bs=10M count=1000

for each disk

Code:

115343360 bytes transferred in 0.919060 secs (125501448 bytes/sec)

which I think is good...

Now, I'm with

Code:

dd if=/mnt/gra1 of=/dev/null bs=10M count=1000                
0+1 records in
0+1 records out
5 bytes transferred in 0.000038 secs (131072 bytes/sec)

When I choose the mnt path.

totally lost :(

 

[huberte]

thks to irc I have now this :

Code:

[root@freenas] ~# cd /mnt/gra1/
[root@freenas] /mnt/gra1# dd if=/dev/zero of=testfile bs=2048k count=400
400+0 records in
400+0 records out
838860800 bytes transferred in 0.933686 secs (898439929 bytes/sec)

But still 5 MB/S through ftp :(

So it's obviously not a storage pb, please move to network pb. thks.

 

[Milhouse]

Move to Networking.

Test your network performance using the iperf tool built in to FreeNAS 8.0.1.

 

[huberte]

Thanks, which protocol does it use ?

Between freenas (gigabit) and my computer (wih I former have 80 MB/S through ftp), also gigabit :

Code:

[156] local 192.168.0.6 port 6707 connected with 192.168.0.14 port 5001
[ ID] Interval       Transfer     Bandwidth
[156]  0.0-10.0 sec  54.1 MBytes  45.4 Mbits/sec

Between, laptop (megabit) and freenas :

Code:

[156] local 192.168.0.7 port 53776 connected with 192.168.0.14 port 5001
[ ID] Interval       Transfer     Bandwidth
[156]  0.0-10.0 sec   109 MBytes  91.1 Mbits/sec

Betwean laptop and computer :

Code:

[156] local 192.168.0.7 port 53910 connected with 192.168.0.6 port 5001
[ ID] Interval       Transfer     Bandwidth
[156]  0.0-10.0 sec  39.1 MBytes  32.8 Mbits/sec

Could we say that's not a freenas problem, but my client computer problem and close the thread ?

 

[Milhouse]

The protocol is TCP (also UDP if you specify -u/--udp) - it's testing your raw network performance without the overhead of any file system protocols such as SAMBA/CIFS, NFS, FTP etc.

It certainly doesn't look like there is any problem with the FreeNAS network connection, Windows (the OS) however may be throttling the connection by using a small TCP "window" size - you can increase the window size by specifying the "-w" parameter on the client (maybe also the server), eg. "-w 128K" would use a larger TCP transmit/receive window which may improve performance.

 

[huberte]

I'm really lost here, still stuck with 4,5Mbits/s

what should I do with my crappy windows ?

Didn't understand the -w parameter and where...

 

[Andy L]

I've been playing with iperf myself and trying to increase my FreeNAS box's performance - I found that using the command 'iperf -c <server IP> -w 131072' (131072 bytes = 128KBytes) gave a higher throughput when testing. If your version of Windows dates from Vista onwards (e.g. 7, Server 2008), I found these guides to be useful in improving performance at the Windows end:

http://www.speedguide.net/articles/windows-7-vista-2008-tweaks-2574
http://en.tiagomarques.info/2011/03/freenas-improve-cifssmb-performance/