[pve-devel] [PATCH pve-doc 2/5] ZFS RAM usage more precise.

[Alexandre DERUMIER]

>>+ZFS uses a lot of memory, a good calculation is 4GB plus 1GB RAM
>>+for each TB RAW disk space if you want to use ZFS.

also, if l2arc is enabled, zfs take 240 bytes memory for each block in l2arc.
if you use small block (4k) for your pool for example, this can be very huge (64GB memory for 1TB)



----- Mail original -----
De: "Wolfgang Link" <w.link at proxmox.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Lundi 3 Octobre 2016 09:28:56
Objet: [pve-devel] [PATCH pve-doc 2/5] ZFS RAM usage more precise.

--- 
pve-installation.adoc | 4 ++-- 
1 file changed, 2 insertions(+), 2 deletions(-) 

diff --git a/pve-installation.adoc b/pve-installation.adoc 
index 032fd51..485f077 100644 
--- a/pve-installation.adoc 
+++ b/pve-installation.adoc 
@@ -135,8 +135,8 @@ required for lvmthin snapshots). 
ZFS Performance Tips 
^^^^^^^^^^^^^^^^^^^^ 

-ZFS uses a lot of memory, so it is best to add additional 8-16GB RAM 
-if you want to use ZFS. 
+ZFS uses a lot of memory, a good calculation is 4GB plus 1GB RAM 
+for each TB RAW disk space if you want to use ZFS. 

ZFS also provides the feature to use a fast SSD drive as write cache. The 
write cache is called the ZFS Intent Log (ZIL). You can add that after 
-- 
2.1.4 


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