Sorry if i dont answer before , im still reading all this thead , i'm on page 15 !!
Thank for your reply , iv take a look soon !!!!
EDIT:
Good morning at all , yesterday i was reading an article about zfs "improvement/tuning" ...I've tried some settings for the limit arc cache.
When i run the command in the terminal " cat /proc/spl/kstat/zfs/arcstats |grep c_" the result was :
c_min 33554432
c_max 8392192000
My system had 16G ram ( not so much, but not so bad ) ,so I tried to change this value creating a file zfs.conf in /etc/modprobe.d whit this parameter :
#Min: 4GB
options zfs zfs_arc_min=4000000000
#Max: 10GB
options zfs zfs_arc_max=10000000000
And then reboot the server, after another "cat /proc/spl/kstat/zfs/arcstats |grep c_" this is the new value of arc cache
c_min 4 4000000000
c_max 4 10000000000
arc_no_grow 4 0
arc_tempreserve 4 0
arc_loaned_bytes 4 0
arc_prune 4 0
arc_meta_used 4 7203712
arc_meta_limit 4 6294145536
arc_meta_max 4 7206128
arc_meta_min 4 16777216
arc_need_free 4 0
arc_sys_free 4 262254592
At moment the server run ok, and the read/write speed is higher than before, but someone could tell me if this parameter could impact on the server function ??
Someone have some advice for other improvements??
Thank's everybody