High speed RW cache with array parity?

[cometship]

New to UNRAID and watched spaceinvader1 to learn.

I have a 10GbE NIC, HDDs for array, SDDs and 1 NVME for cache.

 

I can't figure out how to configure a cache so I can benefit from high speed read and write AND also keep contents duplicated in the array for protection.

A share with PREFER cache will meet the high speed RW, but the data won't be in the array for protection.

CACHE YES will write on the cache, and later move data to the array negating IO performance.

 

I could, I guess, setup a RAID1 CACHE, but I wonder if there is another solution.

Thanks!

 

 

[trurl]

You can have multiple pools, and each can have multiple disks if configured with a btrfs raid mode.

 

https://wiki.unraid.net/Manual/Storage_Management#Pool_Modes

[cometship]

trurl. yeah I know I can create RAID1 btrfs multiple disk cache.

But I was hoping to have both fast IO cache AND disk array parity backup built in feature for a given share.

 

Like this **addition**:

No: Only stored on array.

Yes: write on the cache and later move them to the array

Only: Only stored on the cache, never moved to the array.

Prefer: Will prefer to store on the cache, if the cache is full will move to the array.

**Both**: will keep and synchronize data between cache and the array.

 

 

[trurl]

pools and array are both part of user shares, so if the same folders and files existed in both they would be duplicates. You can create a script to make a backup to some backup share and schedule it with User Scripts plugin.

[trurl]

Also, parity is not a backup, so even your array files don't have backups unless you create them.

[cometship]

Thanks for the script idea. I'll setup a backup share and use rsync in a script.