Date: Mon, 05 Sep 2016 16:56:49 +0200 From: =?UTF-8?Q?Sol=C3=A8ne_Rapenne?= <solene@perso.pw> To: freebsd-questions@freebsd.org Subject: High availability storage : raid1 of iSCSI or iSCSI + hast Message-ID: <e0445cf02579fa338e6ff63fa93f54b3@mail.zplay.eu>
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Hello,
I am building a high availability cluster with FreeBSD, to make it
simple, we have 2 master/slave server called Web1 and Web2 and 2
master/slave file server called iSCSI1 and iSCSI2.
I have been thinking about 2 options and I would like to have some
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
on the webserver who is the master.
- the second is mounting the iSCSI target from the master iSCSI
server and the master iSCSI server will replicates the data to the slave
1st option : MASTER Web connects to both iSCSI server and make
a raid1 of the iSCSI
pros : in case of failure of iSCSI 1 or 2, Web isn't affected
cons : slow ? network bottleneck ?
+---------+ CARP +---------+
| Web1 | <----> | Web2 |
+---------+ +---------+
|raid1\
| \__________
| \
+---------+ +---------+
| iSCSI 1 | | iSCSI 2 |
+---------+ +---------+
2nd option : MASTER Web connects to MASTER iSCSI server,
which replicates to slave iSCSI server with HAST
pros : no idea
cons : if we want to switch the iSCSI server we have to stop everything
+---------+ CARP +---------+
| Web1 | <-----> | Web2 |
+---------+ +---------+
|
|
+---------+ CARP + +---------+
| iSCSI 1 | HAST | iSCSI 2 |
+---------+ <----> +---------+
Thank you for reading
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