My server is locking up temporarily

[DanielPT]

Hi all.

 

I have this issue for a long time but now i want to get it fixed

 

Dell PowerEdge T350.

Intel® Xeon® E-2336 CPU @ 2.90GHz

32 Gb ram

Unraid : 6.11.5

 

When something is downloading or im doing docker upragdes or something on the server i get CPU spikes.

But the it is only for a small mount of time.

 

My cache drive is 2 x Samsung 870 evo in a pool btrfs.

 

So it cut be 2 things 

 

1: A bug in the Samsung drives?

 

2: High IOwait. But how can i see if this is the problem?

 

Thanks!

 

 

 

[JorgeB]

When this happens it usually helps to dedicate a fast device for downloads and/or use exclusive shares for that.

[DanielPT]

3 minutes ago, JorgeB said:

When this happens it usually helps to dedicate a fast device for downloads and/or use exclusive shares for that.

Hi JorgeB

 

Yeap i use my cache drives for the downloads.

 

What about this guy ?

 

(1) Boost Your Unraid NAS Performance by 50%: Fix Disk IO Wait - YouTube

 

He talks about edit tha appdata folders to point at the cache drive. But my appdata folder allready is set tu "prefer" cache

[JorgeB]

1 hour ago, DanielPT said:

He talks about edit tha appdata folders to point at the cache drive.

That means using the disk path /mnt/cache/share instead of user path /mnt/user/share, it has the same effect as enabling exclusive shares as I mentioned above.

[DanielPT]

Okay but im a little confused

 

My appdata is set to "Prefer cache" so it is on the SSDs.

 

But changing the paths to the disk will change anything?

 

Thanks!

[itimpi]

5 minutes ago, DanielPT said:

But changing the paths to the disk will change anything?

The idea is that by-passing the Unraid Fuse layer that supports User Shares then there is better performance.

 

as was mentioned if you are on a 6.12.x release then you can get the same performance by setting up the share to run in Exclusive mode without having to change paths.

[DanielPT]

Okay but my download patch is allready on the cache and the mover moves it at night.

 

But how can i investiagte if i got IOwait or something else make the system unsuable for some seconds?

[DanielPT]

Hmm so it is a good idea to set my download folder and appdata folder to Exclusive mode ? They are on the same Samsung SSD pool.

[itimpi]

33 minutes ago, DanielPT said:

Hmm so it is a good idea to set my download folder and appdata folder to Exclusive mode ? They are on the same Samsung SSD pool.

If that is the only place they are located (I.e. nothing set for secondary storage) then the answer is yes.    Note that to get Exclusive mode you first need to make sure this set to be available under Settings- Global Share settings, and then also enable it for the relevant shares.   
 

[DanielPT]

7 minutes ago, itimpi said:

If that is the only place they are located (I.e. nothing set for secondary storage) then the answer is yes.    Note that to get Exclusive mode you first need to make sure this set to be available under Settings- Global Share settings, and then also enable it for the relevant shares.   
 

But can i breake something when using exclusice shares? Is it not better to check if it is IOwait first before i do anything?

I do use hardlinks for my downloads.

[itimpi]

35 minutes ago, DanielPT said:

But can i breake something when using exclusice shares?

Not that I know of. 

 

36 minutes ago, DanielPT said:

Is it not better to check if it is IOwait first before i do anything?

 

Using an Exclusive share is more efficient so would probably reduce ioWait as well.

[DanielPT]

16 hours ago, itimpi said:

Not that I know of. 

 

 

Using an Exclusive share is more efficient so would probably reduce ioWait as well.

Okay cool.

 

Meaby i should just hit the exclusive buttom for my download patch. Can i "Go back" if it is breaking something?

[itimpi]

1 hour ago, DanielPT said:

Okay cool.

 

Meaby i should just hit the exclusive buttom for my download patch. Can i "Go back" if it is breaking something?

You can switch Exclusive mode for a share off and on although it may (I am not sure) take a reboot to activate the change.

[DanielPT]

Okay i need to upgrade to 6.12.3 to get exclusive share.

 

So i have 2 options:

 

1: Upragde to 6.12.3 and make appdata exclusive

 

2: Move my app data to the guild in Dell ssd and take the risk that it will blow someday and i need to restore my dockers from backup

 

What will you think will help me?

 

Netdata got me this today

[DanielPT]

HI all

 

I still got some heavy IOwait and it is killing me

 

I use exclusive share for my appdata folder. But when downloading/uploading all my dockers get unresponsive

 

But i can also see that RAM is been used for cache when it is happening?