NetApp NFS vs. ZFS and NFS for Maildir

[Juan Bernhard]

El 11/03/2016 a las 12:04 p.m., Charles Marcus escribió:
> On 3/11/2016 9:58 AM, Juan Bernhard <juan at inti.gob.ar> wrote:
>> Be careful to no do any synchronous writes under ZFS. Every sync write
>> can take up to 3 seconds of latency (under freebsd, I didnt test ZFS in
>> linux). Im using it in a 3k user environment and works great with a 4TB
>> raid 10, and dovecot cache files in a SSD disk.
>
>>From what I've heard you should not use hardware based RAID (ie, RAID10)
> setups with ZFS, you should let ZFS handle it.
>
> Maybe that is the source of your latency issues?
>
There are actually two ZFS raid1 but in the same zpool, and the SSD in 
local, not in the ZFS dtorage. The latency was because I tried to use a 
ZFS for datasore of a vmware undres NFS, and NFS under vmware is always 
synchronous. I improved 10 times the performance under iSCSI