Proxmox + LVM cache

[masterdaweb]

Hey there,


I've seen that using ZFS on a HW RAID is not advisable.

Due to this advices, In my setup with Hardware Raid, I've been planning to use LVM with cache, instead of ZFS.

Have someone experienced good perfomance, working on Proxmox + LVM Cache ?

 

[alexskysilk]

Hey there,


I've seen that using ZFS on a HW RAID is not advisable.

Due to this advices, In my setup with Hardware Raid, I've been planning to use LVM with cache, instead of ZFS.

Have someone experienced good perfomance, working on Proxmox + LVM Cache ?

Typically this is a bad idea. ZFS has its own caching (ARC/L2ARC) and works best with direct access to the disk interface. creating a vdev on top of a lvm volume in technically possible but is not likely to achieve desirable results.

 

[Alessandro 123]

Typically this is a bad idea. ZFS has its own caching (ARC/L2ARC) and works best with direct access to the disk interface. creating a vdev on top of a lvm volume in technically possible but is not likely to achieve desirable results.

User has explicitly said to NOT use ZFS

 

[alexskysilk]

User has explicitly said to NOT use ZFS

Laughs I clearly have a problem with reading comprehension.

LVM is fully supported and works well. As for cache- I havent used cached lvm with proxmox ; the LVM caching algorithm is primitive and may yield inconsistent results, but you can be sure it wont reduce your performance

 

[LnxBil]

Several years ago, I tried bcache and flashcache and both worked fine in write-back and write-through mode. Performance increase was huge.

A side effect was, that after each reboot, the cache needs to be synced and the performance was very, very bad until it finished. Besides that, it worked - yet I did not use it in production. It was more a proof of concept.