ZIL and ARC are internal parts of ZFS. No need to do anything with them.
If you want to improve read performance you can extend the ARC (Read cache from unused RAM), by adding a L2ARC to the pool with menu pool - add read cache ssd
Zil (the log for sync writes) is usually located on your pool. To improve sync write performance, you can use a dedicated ZIL drive instead. This is also pool wide and done with menu pool - add write cache ssd
A spare in ZFS is the same as always. If a disk fails it is replaced with a spare if the spare has at least the same size. ZFS is flexible in size. Your pool can be build also from vdevs in different sizes.
Thanks. What confused me was the fact that I could add a smaller disk to a pool with larger disks size and a article I read seems to mix up Spare and L2ARC in the same sentences.,,
ZIL and ARC are internal parts of ZFS. No need to do anything with them.
If you want to improve read performance you can extend the ARC (Read cache from unused RAM), by adding a L2ARC to the pool with menu pool - add read cache ssd
Zil (the log for sync writes) is usually located on your pool. To improve sync write performance, you can use a dedicated ZIL drive instead. This is also pool wide and done with menu pool - add write cache ssd
A spare in ZFS is the same as always. If a disk fails it is replaced with a spare if the spare has at least the same size. ZFS is flexible in size. Your pool can be build also from vdevs in different sizes.
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