I have suddenly started getting single figure read speeds from my array. It normally reads between 70-100MB/s, write speeds are still fine at 45-50MB/s.

 

It started last weekend when i was trying to get mysql working, i uninstalled mysql and read speeds returned to normal but its started again this morning.

 

I am a complete novice when it comes to Linux so dont have a clue where to start to try and diagnose this problem

 

syslog-2013-11-17.txt

Are you coping 3 things at once?  If so I would expect those speeds.

 

 

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Sorry should have said the first image is writing to the array, image 2 & 3 are reading from array all done seperatly

 

 

Attach the entire syslog. It must include a period of slow performance.

How do i get the full syslog? I have been downloading it from the unraid menu syslog page

 

 

I have just done more testing

 

i copied 11gb from unraid server to pc started the copy at 0812 and it completed at 09.19

 

I copied 4.5gb from pc to unraid server the copy started at 0920 and it completed at 0923.

 

I have telnetted onto the server and copied the syslog cp  /var/log/syslog  /boot

syslog.txt

The log ends at Nov 18 08:28:37. When exactly did the tests occur?

The test where ran between 0812 and 0930 and then the syslog copied at 0931 today. all times are GMT

 

I have attached the latest syslog that i have just copied at 16.27

 

 

syslog-2013-11-18.txt

Do all of the disks have slow read performance? Post SMART reports for slow disks.

Ive checked reading from all disks and they are all having the same slow read speed.

 

smartcache.txt

smartdisk1.txt

smartdisk2.txt

smartdisk3.txt

more smart reports and syslog after shutting down and restarting server

smartdisk4.txt

smartdisk5.txt

smartparity.txt

syslog-2013-11-181.txt

Ive checked reading from all disks and they are all having the same slow read speed.

Are the symptoms the same on all the client machines, or just the PC in your original post?

Check for MB BIOS and SATA card firmware updates.

Ive checked reading from all disks and they are all having the same slow read speed.

Are the symptoms the same on all the client machines, or just the PC in your original post?

 

Ive only got the original pc connected through the gigabit switch, my laptop is connected via 10/100 nic and it gets 10MB/s write speeds and 2-3MB/s read speeds

 

Check for MB BIOS and SATA card firmware updates.

Check for MB BIOS and SATA card firmware updates.

 

Trying to understand how you guys are reading the syslog. What did you read in the syslog to come to the conclusion that the sata card needs a update or the MB Bios?

Do you mean check the Bios settings because something changed or a Bios Update?

 

I have suddenly started getting single figure read speeds from my array. It normally reads between 70-100MB/s, write speeds are still fine at 45-50MB/s.

 

It started last weekend when i was trying to get mysql working, i uninstalled mysql and read speeds returned to normal but its started again this morning.

 

 

If danneh problem only started after his sql install then wouldn't this issue be software or network related?

 

also saw this in the syslog. Would this cause any problems..?

 

FAT-fs (sdb1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.

 

The server has been running perfectly for nearly 3 months without any change so not sure why firmware would help?

 

I dont understand that FAT-fs message there isnt a SDB1 disk in the array?

 

 

I dont understand that FAT-fs message there isnt a SDB1 disk in the array?

That is probably your USB stick that you are booting from.  That is in FAT format.

I dont understand that FAT-fs message there isnt a SDB1 disk in the array?

That is probably your USB stick that you are booting from.  That is in FAT format.

 

It indicates that the system is not being shutdown correctly.

How do i run fsck? will running the fsck clear that message from the syslog?

 

I had to power down server by holding down the power button a few weeks ago when i couldnt connect but everytime since i have been stopping the array and then shutting down from the unraid menu.

How do i run fsck? will running the fsck clear that message from the syslog?

 

I had to power down server by holding down the power button a few weeks ago when i couldnt connect but everytime since i have been stopping the array and then shutting down from the unraid menu.

 

Put the flash in a PC or Mac and run check disk.

i have run check disk on the flash disk now and the error message has cleared from the log but read speeds are still single figures 

Have you tried pulling the power to the hub / switch the server is connected to?

 

Had similar issues a while back and resetting the hub / switch saw a return to full speed but it slow right down after a day or so.

 

Replaced it and all is good and at full speed again.

 

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Replace the Ethernet cable between your UnRAID server and the router.  If one of the pairs has developed an issue, this will cause strange slowdowns -- I've seen this before where transfers in one direction were fine (e.g. your writes), but the other direction was very poor.

 

These symptoms can indicate a cable issue; a bad port on your switch (or router);  or some combination of both.  From what you've outlined, I'd try a different cable first.

 

Ive rebooted the switch and changed which ports im using and speed is now back up to normal

 

Thanks for the help everyone

Glad it's working well -- sounds like you have a bad port on the switch.