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Date:      Fri, 22 Mar 2013 09:16:13 -0400
From:      Mark Saad <nonesuch@longcount.org>
To:        "freebsd-performance@freebsd.org" <freebsd-performance@freebsd.org>
Subject:   Re: FreeBSD 9.1 vs CentOS 6.3
Message-ID:  <FA0CCB69-CDC6-4069-849E-9333218FECF6@longcount.org>
In-Reply-To: <514C2D36.8090505@contactlab.com>
References:  <514C1E5F.8040504@contactlab.com> <CAA%2BPJRFcdX-EEZD6W6NE%2BvUsiBV=VvZLGZvMw9AFkbGUynce3Q@mail.gmail.com> <514C2D36.8090505@contactlab.com>

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

> 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 Z=
FS /DATAZFS partition):
>=20
> - 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;
>=20
> The UFS filesystems performed at 400MBps without any tweak while ZFS perfo=
rmed at 400MBps after tweaks.
>=20
> So I don't think that these levels of performaces are related to file syst=
em.
>=20
> Thanks,
> d.
>=20
> _____________________________________________

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

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




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