Hi everyone,

My array is based on an old mobo (SATA I). My main problem is that, having 18 disks means a bit less than a day for a parity check, but otherwise, eveything is fine.

 

My only problem is that although I have  a write speed of 25-40MB/s, my read speed ranges from 8.3-9.3MB/s. This is not terrible, but obviously does not make sense.

Any suggestions?

syslog?

syslog?

 

Here it is. I didn't post it cause I thought there is nothing wrong with it but, truth be told, some of the messages seem like Sanskrit to me.

syslog_2013-02-12.txt

Well you are right, I (your amateur Sanskrit reader, Linux dialect only) see nothing particularly wrong in your syslog.

 

Can you give us a few more details as to what these read and write operations are and how you are measuring those numbers?  Are they networked reads and writes?  What OS is running on the network machine you are using to read and write to your UnRAID server?  If it's a Windows Vista or later, have you seen this page?  Tom first mentioned it, said it helped him, and I found it made a significant improvement for me too, small improvement on writes and big improvement on reads.  I'm hoping to write it up and add it to the Improving unRAID Performance page.

Well you are right, I (your amateur Sanskrit reader, Linux dialect only) see nothing particularly wrong in your syslog.

 

Can you give us a few more details as to what these read and write operations are and how you are measuring those numbers?  Are they networked reads and writes?  What OS is running on the network machine you are using to read and write to your UnRAID server?  If it's a Windows Vista or later, have you seen this page?  Tom first mentioned it, said it helped him, and I found it made a significant improvement for me too, small improvement on writes and big improvement on reads.  I'm hoping to write it up and add it to the Improving unRAID Performance page.

 

First of all, thanks for your feedback. Now, for some extra info:

1. I am using Windows 7 64

2. I followed the instructions from the provided URL but there was no change (to be honest, that is what I expected; I hadn't changed anything in my PC and previously I used to get reading speeds >30MB/s).

3. I measure the speed by the indication of the copy window on my Windows PC (I use teracopy, which report 9). Additionally, the 'Disk Performance' tab of unMenu is reporting a speed of around 4500KB/s (exactly the half). The numbers I report are not even average speeds for lots of small files but for just a big one. The absolute proof is that an 8087MB file took  minutes to copy from unRaid->PC. So the actual speed is 9MB/s.

4. I think (but cannot be absolutely certain) that this problem might have appeared after upgrading from 4.7 -> 5.10.  I know for certain I had no such problem with 4.7 but I cannot wuite pinpoint whether the read speed was so low immediately after I upgraded or it became slow later.

 

What does "ethtool eth0" and "ifconfig" show? Try a new Ethernet cable, CAT 5e or better.