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Date:      Tue, 21 Oct 2014 09:23:49 +0200
From:      Egoitz Aurrekoetxea <egoitz@sarenet.es>
To:        Mark Felder <feld@FreeBSD.org>
Cc:        freebsd-xen@freebsd.org
Subject:   Re: disk loss
Message-ID:  <0084B089-9F31-43F0-8ED4-77CB45AE424D@sarenet.es>
In-Reply-To: <1413808457.2828604.181041145.4121AB54@webmail.messagingengine.com>
References:  <000001cfe3ca$8d242950$a76c7bf0$@ezwind.net> <5436CF13.4080509@citrix.com> <000101cfe3f1$91407da0$b3c178e0$@ezwind.net> <65CC3330-E22F-4253-918E-72CA9B004A81@sarenet.es> <1413808457.2828604.181041145.4121AB54@webmail.messagingengine.com>

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Egoitz Aurrekoetxea
Departamento de sistemas
944 209 470
Parque Tecnol=C3=B3gico. Edificio 103
48170 Zamudio (Bizkaia)
egoitz@sarenet.es <mailto:egoitz@sarenet.es>
www.sarenet.es <http://www.sarenet.es/>;
Antes de imprimir este correo electr=C3=B3nico piense si es necesario =
hacerlo.

> El 20/10/2014, a las 14:34, Mark Felder <feld@FreeBSD.org> escribi=C3=B3=
:
>=20
>=20
>=20
> On Mon, Oct 20, 2014, at 02:09, Egoitz Aurrekoetxea wrote:
>> Good morning,
>>=20
>> I would recommend you using NFS instead of iSCSI. It=E2=80=99s far =
more better to
>> handle the connection to disk arrays (the FreeNAS in this situation)
>> through a mature and stable protocol like NFS
>> and not something manipulating blocks directly. I would advise you to
>> rely the responsibility of serving the SR to NFS.=20
>>=20
>=20
> You can't have redundant paths with NFS (in FreeBSD), though. I'm not =
so
> sure everyone would agree that NFS is mature and stable, either :-)


Sure you can have redundant paths with a proper configuration with =
Spanning tree=E2=80=A6 and everything not touching directly blocks
is IMHO always safer=E2=80=A6 because the part you rely the disks =
integrity is all in the same place=E2=80=A6 and takes care of committing =
changes
properly having less probabilities to leave the vdi corrupt=E2=80=A6.

Faster??=E2=80=A6 how have you written to disk?? the file system you =
have used to which NFS was doing I/O how did it manage the write =
commits?. Did=20
you use Jumbo frames?=E2=80=A6 there is pretty relative all that you =
have said=E2=80=A6 And IMHO yes, NFS is tested and tried (mainly in some =
versions and configs)=20
very extensively and with very high loads=E2=80=A6 apart nowadays 10gbps =
switches exist...

>=20
> My personal experience with building a Xen+FreeBSD cluster concluded
> that NFS was far too slow and unreliable, and a properly configured
> iSCSI with multiple paths and proper alignment was extremely fast.
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