Cache pool only RAID-1?

[saarg]

I tried to look around for an answer, but didn't find any, and thought I'd ask before trying.

Is the cache pool only RAID-1 or is it possible to use jbod?

[itimpi]

I tried to look around for an answer, but didn't find any, and thought I'd ask before trying.

Is the cache pool only RAID-1 or is it possible to use jbod?

unRAID only supports RAID-1 on the cache drive. 

 

Whether this is true if you bypass the GUI then I am not sure if this limitation still applies.

[saarg]

That was what I thought. I could probably work around this, but it isn't important enough to dig into, unless someone already did it and have the solution laid out for me

 

Thank you for the answer.

[limetech]

You can set up a raid-0 cache pool.  When you click on the 'cache' device after array Started and cache is mounted, scroll down to 'Balance' section and you will see default Balance options are:

-dconvert=raid1 -mconvert=raid1

You can change the 'raid level' by editing these options and click Balance.  For example, to have data raid0 but leave metadata raid1 you could change to:

-dconvert=raid0 -mconvert=raid1

You can monitor syslog to watch balance operation proceed.

 

Note that, at present, the s/w will "revert" the default balance options back to:

-dconvert=raid1 -mconvert=raid1

That is, we don't store your selection.  Similarly if you add a device to an existing pool it will automatically kick off a balance with the default options.  We plan to address this in a future release, but for now you can experiment with it.

[saarg]

Thanks Tom

[morti]

I do only know basics about about raid levels, but metadata is a new term for me. Google helped me a little, but not enough to base decision upon it.

 

If I set up a new raid0 ssd cache, do I want to keep the metadata, or do I want to set -mconvert=raid0 ? What is the difference?