One path per controller though its own switch is usually enough.
I install multiple links between storage and switches, to increase the
bandwidth of that link. But I've never done that between switches and hosts.
Link A from host to Switch A to Storage Controller A
Link B from host to Switch B to Storage Controller B
-Original Message-
From: jorgevisent...@gmail.com
Sent: Wednesday, September 15, 2021 1:37 PM
To: users@ovirt.org
Subject: [ovirt-users] Re: 2-node with FC Storage
Hey man, what's up?
So... I use 4 FC cables (2 per controller) connected from Storage to FC Switch.
From this FC Switch I connect my hosts with 4 FC cables.
The more cables from Storage to Switch, the more throughout you will get.
That way I can use multipath. So when I drop an FC cable or a Storage
controller, I wouldn't lose connection.
In this way it is also possible to use all virtualization technologies, such as
LUN migration between Storage and/or Live Migration.
An example of multipath:
3600d0231000465cf19190aad44bfbbca dm-14 IFT,DS 4000 Series size=5.0T
features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| |- 1:0:2:14 sddv 71:208 active ready running
| |- 2:0:2:14 sddm 71:64 active ready running
| |- 4:0:2:14 sdek 128:192 active ready running
| |- 5:0:2:14 sddw 71:224 active ready running
| |- 6:0:2:14 sdes 129:64 active ready running
| |- 7:0:3:14 sdgz 132:240 active ready running
| |- 8:0:1:14 sdje 8:384 active ready running
| `- 9:0:1:14 sdnj 71:336 active ready running
`-+- policy='service-time 0' prio=10 status=enabled
|- 1:0:3:14 sdhw 134:96 active ready running
|- 2:0:3:14 sdgb 131:112 active ready running
|- 4:0:3:14 sdko 66:448 active ready running
|- 5:0:3:14 sdjm 65:256 active ready running
|- 6:0:3:14 sdla 67:384 active ready running
|- 7:0:2:14 sdcp 69:208 active ready running
|- 8:0:2:14 sdlz 69:272 active ready running
`- 9:0:0:14 sdmg 69:384 active ready running
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