Samba/FTP slow write fast read

[George Toft]

Further investigation shows it's not FTP nor samba.  It's Windows 7 
(which I used for Windows file and FTP).  Using smbclient on a Linux box 
I get 19MB/sec and FTP from Linux I get 32MB/sec.  Concurrent with 
replacing the old file server was the purchase of a new PC.  I guess we 
know what XP does better than Windows 7.

Regards,

George Toft

On 10/27/2012 6:01 PM, George Toft wrote:
> Spent several hours researching this one - can't find a solution.  I 
> hope someone here can hit me with a clue-by-four.
>
> CentOS 6.3 64-bit virtual running under VMware 2.0.2 fresh install 
> with FTP/Samba/NFS running.  I copied 500+GB of data from the old 
> computer to the new one using NFS at full network speed (11+ MB/sec).  
> Life's good.
>
> Now here it is a day later, and my samba write speed is a blazing 
> 80KB/sec (up from 40KB/s when I started troubleshooting).  I read 
> samba should approach FTP speed and I verified it does - FTP writes to 
> the new machine at about the same speed.  Reads still take place a 
> full speed (now it's on a 1Gbps network) - 33MB/sec. Writes . . . 
> 99.8% slower.  I did not have this problem on the previous samba 
> server (CentOS 4.8 32-bit).
>
> I added memory (it now has 1GB RAM, 1 GB swap) and it has 2 CPU's. 
> This had no effect.
>
> In summary, NFS works at full speed both ways.  Samba/FTP are fast on 
> reads but snail slow on writes.
>
> My next thought is to install ClearOS, test it, and copy their 
> smb.conf.  Or install CentOS 5.x and see if it has the same problems.
>
> Any ideas where to look on this one?  smb.conf necessary.
>