Was: Re: Positive feedback on performance (RC6-test2)

[Chris Pollard]

Might be a loose cable,  you could post a full smart report here for people to look at. Should be instructions in the wiki.

[Joe L.]

Might be a loose cable,  you could post a full smart report here for people to look at. Should be instructions in the wiki.

A smart report might show something, but odds are a syslog from the period of time where the poor performance is occurring is more useful.

[ix400]

I think I can exclude a cable causing the issues. I swapped the drive to a different bay (I'm using Supermicro's CSE-M35 enclosures), and that doesn't help either.

 

Here is a log file:

 

https://dl.dropbox.com/u/7782292/log.rtf

 

It was recorded during two buffering events. However, during the time the buffering happened no entries were made in the log. In other words, the buffering occurred in the 5 minutes after the last log entry.

 

As mentioned before, during that time I observed high %wa values, and it seems to happen when the movie file is opened for the first time after a reboot. The 2nd try to play the same movie from the beginning works without buffering, and %wa stays low.

 

I will also generate a smart-report in the next hours.

 

Thanks for your help,

 

Chris

[ix400]

Hi,

 

I've finished preparing the smart reports:

 

https://dl.dropbox.com/u/7782292/smart_disc_10_long.txt

https://dl.dropbox.com/u/7782292/smart_disc_10_short.txt

 

To me the results looks like as if the disc is okay.

 

What else can I do? 

 

Chris

[ix400]

... and I have to add:

 

Yesterday I configured the LAN as 100Mb in order to see if the buffering is influenced by that. I had the feeling that I see it less frequently, but it's still there.

 

Anyhow, I looked for dropped packets this morning. I used the server quite a bit yesterday, so this log is based on more network traffic:

 

root@Neon:~# ifconfig

eth0      Link encap:Ethernet  HWaddr 00:30:48:b2:0f:e6 

          inet addr:192.168.1.120  Bcast:192.168.1.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:8051675 errors:0 dropped:27 overruns:0 frame:0

          TX packets:15119121 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:572095857 (545.5 MiB)  TX bytes:4000581494 (3.7 GiB)

          Interrupt:43 Base address:0x8000

 

27 dropped packets. I guess in 1000Mb moder the rate would have been even higher, wouldn't it?

 

Chris

[ix400]

... but if the network would cause the problems also the movie playback from discs 1 to 9 would be effected. But only disc 10 causes the problems and shows the high %wa during the first minute of a started movie playback.

 

Chris