10:36 a.m.
Hello,
i want to run an 2-node oVirt cluster, where both nodes are connected to an FC Storage.
What is the best practice to connect LUNs to it, so that you can switch VMs between both
nodes?
Thanks
1:37 p.m.
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
5:12 p.m.
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: jorgevisentini(a)gmail.com <jorgevisentini(a)gmail.com>
Sent: Wednesday, September 15, 2021 1:37 PM
To: users(a)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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participants (3)
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carsten.recker＠ccf.de -
jorgevisentini＠gmail.com -
Matthew.Stier＠fujitsu.com