Jump to content

VM's and Docker on unassigned device?


Recommended Posts

Hi!

 

I just recently built a "homeserver" of some old hardware (Gigabyte UD5, 4930K and 64GB RAM and some WD RED 4TB) and a couple of new disks.

From the looks of it Unraid is the server OS I'm looking for, so I decided to give it a shot.

 

Since it will be moving a lot of big files I didn't really want to use an SSD as a cache-drive, so I took one of my old "WD RED 4TB".

 

But I have noticed that the VM's and Dockers do take a hit when the big files are beeing written, so my question before I decide:

Is it possible to store the dockers and VM's on an SSD as an unassigned device, or is it any downside to this if possible?

Link to comment
51 minutes ago, Koenig said:

I hope the same goes for the Dockers?

Yes

 

Another approach is to use SSD as cache but don't cache user share writes. This saves all the cache SSD for docker / VMs and writes to user shares are immediately protected by parity. If you still want a little more performance on writing to user shares on the array there is turbo-write mode. Not as fast as writing to cache but doesn't have the disadvantages of temporarily having your user share data on cache, where it will be unprotected (unless using a cache-pool) until moved (which just delays the performance hit of writing to the array).

Link to comment
10 minutes ago, Koenig said:

OK, I see.

 

Maybe I'll switch it up later, but for now I'll go for my first thought.

 

And then another question popped up as I connected my SSD: What filesystem to use? Any recommendations here?

If you only want to read the drive on unRAID then I would go with XFS.    If you want to read it on another system then I would suggest formatting it on that system to a supported file system before plugging it into unRAID.

Link to comment
20 minutes ago, itimpi said:

If you only want to read the drive on unRAID then I would go with XFS.    If you want to read it on another system then I would suggest formatting it on that system to a supported file system before plugging it into unRAID.

 

Only by Unraid.

 

Now I have to figure out how to move the already existing VM's and the dockers...

 

Anyone have a writeup about such things?

Link to comment

So what I did was in a console:

 

cp -a /mnt/user/appdata/. /mnt/disks/SSD/appdata/

cp -a /mnt/user/system/. /mnt/disks/SSD/system/

cp -a /mnt/user/domains/. /mnt/disks/SSD/domains/

 

And then I changed the settings under VM-manager (libvirt and vdisks) to the new locations and the same for Docker (docker.img and appdata)

And lastly I changed the settings for each VM I had already created.

 

I hope this will do it.

  • Like 1
Link to comment
  • 1 year later...
9 minutes ago, tarzan said:

For anyone tempting to do this, don’t! I did it today and have various issues afterwards (dockers that can’t write to the file system, automatic recreation of user shares etc. )

 

I’m gonna try this approach instead> https://forums.serverbuilds.net/t/moving-your-docker-image-and-appdata-to-an-unassigned-drive/1478/7

You have done something wrong somewhere or there's a fundamental issue with your setup.

For example,"automatic recreation of user shares" suggest you have not reconfigured the dockers correctly.

 

Having VM's / dockers on UD is certainly advanced config and thus requires some technical skills to implement.

Nevertheless, your specific issue doesn't warrant a generic "don't" recommendation.

Link to comment
  • 3 months later...

Just a question in relation to docker spacifically... i have offloaded my appdata and .img to a UD. I keep getting the error relating to the config path not being set as R/W Slave. When i try to edit the docker container to fix this the config is the one path that i dont have the edit option next to in order to set this as required.

 

Is this something i should redefine myself by adding a new path and leaving the existing config path empty? obviously as the edit and delete button arent available on the config as standard this isnt an option.

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...