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Date:      Mon, 5 Sep 2016 17:23:22 +0200
From:      Julien Cigar <julien@perdition.city>
To:        =?utf-8?Q?Sol=C3=A8ne?= Rapenne <solene@perso.pw>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: High availability storage : raid1 of iSCSI or iSCSI + hast
Message-ID:  <20160905152322.GA1779@mordor.lan>
In-Reply-To: <e0445cf02579fa338e6ff63fa93f54b3@mail.zplay.eu>
References:  <e0445cf02579fa338e6ff63fa93f54b3@mail.zplay.eu>

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On Mon, Sep 05, 2016 at 04:56:49PM +0200, Sol=C3=A8ne Rapenne wrote:
> Hello,
>=20
> I am building a high availability cluster with FreeBSD, to make it=20
> simple, we have 2 master/slave server called Web1 and Web2 and 2=20
> master/slave file server called iSCSI1 and iSCSI2.
>=20
> I have been thinking about 2 options and I would like to have some=20
> feedback if you run one of the option (or something else) :
>      - the first is to create a raid1 of both iSCSI target and mount it=
=20
> on the webserver who is the master.
>      - the second is mounting the iSCSI target from the master iSCSI=20
> server and the master iSCSI server will replicates the data to the slave
>=20
>=20
> 1st option : MASTER Web connects to both iSCSI server and make
>               a raid1 of the iSCSI
>=20
> pros : in case of failure of iSCSI 1 or 2, Web isn't affected
> cons : slow ? network bottleneck ?
>=20
>     +---------+   CARP   +---------+
>     |  Web1   |  <---->  |   Web2  |
>     +---------+          +---------+
>         |raid1\
>         |      \__________
>         |                 \
>     +---------+          +---------+
>     | iSCSI 1 |          | iSCSI 2 |
>     +---------+          +---------+
>=20
>=20
> 2nd option : MASTER Web connects to MASTER iSCSI server,
>              which replicates to slave iSCSI server with HAST
>=20
> pros : no idea
> cons : if we want to switch the iSCSI server we have to stop everything
>=20
>     +---------+   CARP   +---------+
>     |  Web1   | <----->  |   Web2  |
>     +---------+          +---------+
>         |
>         |
>     +---------+  CARP +  +---------+
>     | iSCSI 1 |   HAST   | iSCSI 2 |
>     +---------+  <---->  +---------+
>=20

there was a recent discussion on @freebsd-fs that may interrest you,
check the whole discussion on:
http://marc.info/?t=3D146729917100015&r=3D4&w=3D2

>=20
> Thank you for reading
> _______________________________________________
> freebsd-questions@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.o=
rg"

--=20
Julien Cigar
Belgian Biodiversity Platform (http://www.biodiversity.be)
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No trees were killed in the creation of this message.
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