FreeBSD 9.1 vs CentOS 6.3

[Mark Saad]

On Mar 22, 2013, at 6:06 AM, Davide D'Amico <davide.damico at contactlab.com> wrote:

> Il 22/03/13 11:00, Traffanstead, Mike ha scritto:
>> May I ask why you're running ZFS on top of a RAID array?  That's not
>> recommended.  One of the advantages of ZFS is that it balance disk
>> activity across devices but when put it on top drives that at are
>> already raided it loses that insight and may end up scheduling
>> reads/writes that all land on the same device.  The only case where
>> it's okay to do this is if you mirroring individual disks (e.g.
>> several RAID-1 devices) and even that's arguable.
> Hi,
> we tried different approaches to a /DATA partition (before trying using a ZFS /DATAZFS partition):
> 
> - an UFS partition (/DATA) on hardware raid10;


What are details of the ufs setup?
Version, softupdate , softupdate journaled, gjournal . What mount options ?

> - a ZFS on hardware raid10;
> - a ZFS mirror on two hardware stripes;
> 
> The UFS filesystems performed at 400MBps without any tweak while ZFS performed at 400MBps after tweaks.
> 
> So I don't think that these levels of performaces are related to file system.
> 
> Thanks,
> d.
> 
> _____________________________________________

What can you tell us about the raid card. And disks ?

---
Mark saad | mark.saad at longcount.org