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Commit a40a9ccc authored by Guiusepe's avatar Guiusepe
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testinf some MD identations. Added a few info about cache in ZFS

parent 965c4b0d
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# ROADMAP # ROADMAP
- [x] RAID{0,1,6,10} - [x] RAID{0,1,6,10}
- [x] ZFS description and capabilities - [x] ZFS description and capabilities
- [X] RAID implementations in ZFS - [x] RAID implementations in ZFS
- [ ] Cache systems in ZFS - [x] Cache systems in ZFS
___ ___
- [ ] ZFS for DB or lvm+ext4 - [ ] ZFS for DB or lvm+ext4
...@@ -72,3 +72,8 @@ ZFS implements versions of RAID0, RAID1 and RAID6. The first and second one are ...@@ -72,3 +72,8 @@ ZFS implements versions of RAID0, RAID1 and RAID6. The first and second one are
As known in RAID10 implementation, ZFS can take two or more RAID1 tank arrangements to make a RAID0 array, resulting in a RAID10 setup. This setup needs at least four total disks As known in RAID10 implementation, ZFS can take two or more RAID1 tank arrangements to make a RAID0 array, resulting in a RAID10 setup. This setup needs at least four total disks
It's important to know that a RAID0 and RAID1 requires at least two disks, and any RAID-Z requires at least n+2 disks, n being the total amount of parity disks available in the system. It's important to know that a RAID0 and RAID1 requires at least two disks, and any RAID-Z requires at least n+2 disks, n being the total amount of parity disks available in the system.
## Cache in ZFS
### Read caching:
- ARC (**A**daptive **R**placement **C**ache) |=| Simple RAM cache.
- L2ARC (**L**evel **2** **ARC**) |=| Adds SSDs in cache flow so oldest data removed from RAM gets on a faster device than hard drives.
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