Replace cache drive

[MvL]

I have a ssd as cache drive at the moment but it's way to small. I'm thinking of to use spinners as my cache drive because they are cheaper. Of course I want speed is this possible with spinners. Is it possible to set 2 or 3 spinners in RAID 0? Are there other options?

[JorgeB]

Yes:

https://lime-technology.com/forums/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480421

 

[MvL]

Some good stuff to read before to go to sleep. Thanks Johnnie!!

[MvL]

Anybody running BTRFS RAID 5?

Edited May 3, 2018 by MvL

[pwm]

32 minutes ago, MvL said:

Anybody running BTRFS RAID 5?

 

Not something I would recommend if you care about your data. Too many corner cases.

[JorgeB]

  Not something I would recommend if you care about your data. Too many corner cases.

 

Yep, much better on latest kernels but write hole still exists. 

 

 

 

[Tybio]

For cache, I'd just backup things required to the array and do Raid0.  Why have all that protected space and then create another bucket of protected space on the device you want the most performance out of?

 

I totally get why some people do, just how I've come down in my thinking...

[pwm]

I wish there was some form of statistics about people who have had issues with their cache file systems.

 

How often there is issues with single-disk xfs. How often with single-disk btrfs. How often with mirrored btrfs. How often with striped btrfs. How often with striped/mirrored btrfs.

 

I get the feeling that btrfs cache pools are quite significantly over-represented in broken caches.

[MvL]

Thanks guys for responding.