Hi,
thank you.
Effecttivly , It's really a lack of not having good support for ISCSI.
Sylvain
De: "Vinícius Ferrão"
À: dalma...@cines.fr
Cc: "Shani Leviim" , "users"
Envoyé: Jeudi 9 Avril 2020 16:06:19
Objet: Re: [ovirt-users] Re: Ovirt and Dell Compellent in ISCSI
It’s the same problem all over again.
iSCSI in oVirt/RHV is broken. For years.
Reported this a while: [ https://bugzilla.redhat.com/show_bug.cgi?id=1474904 |
https://bugzilla.redhat.com/show_bug.cgi?id=1474904 ]
iSCSI Multipath in the engine does not means a thing. It’s broken.
I don’t know why the oVirt team does not acknowledge this. I’m being an idiot
always answering and inquiring about this, but I can’t understand why anyone
doesn’t take this seriously. It’s real, it’s affects everyone and simply does
not makes sense.
Sent from my iPhone
On 9 Apr 2020, at 10:39, "dalma...@cines.fr" wrote:
BQ_BEGIN
Hi Shani,
thank's for the reply.
In this case, the bounding, I think, is inapropriate.
The dell compellent has 2 "fault domain" with différent IP network
This is a iSCSI array with 8 front-end ports (4 per controller). The iSCSI
network is simple: two independant switches with a single VLAN, front-end ports
are split equally between the two switches.
And for each serveur one Ethernet controller is connected on each switch. So,
bonding seems inappropriate.
(see this dell documentation : [
https://downloads.dell.com/manuals/common/scv30x0iscsi-setup_en.pdf |
https://downloads.dell.com/manuals/common/scv30x0iscsi-setup_en.pdf ] )
Maybe I misunderstood how iscsi bonding work in ovirt ?
Regards,
Sylvain
De: "Shani Leviim"
À: dalma...@cines.fr
Cc: "users"
Envoyé: Mardi 7 Avril 2020 15:41:16
Objet: Re: [ovirt-users] Ovirt and Dell Compellent in ISCSI
Hi Sylvain,
Not sure that's exactly what you're looking for, but you can define an iscsi
bond (iscsi multipath) using the UI and REST API:
[
https://www.ovirt.org/develop/release-management/features/storage/iscsi-multipath.html
|
https://www.ovirt.org/develop/release-management/features/storage/iscsi-multipath.html
]
Note that this is a character of the DC.
Hope it helps.
Regards,
Shani Leviim
On Wed, Apr 1, 2020 at 12:35 PM < [ mailto:dalma...@cines.fr |
dalma...@cines.fr ] > wrote:
BQ_BEGIN
hi all,
we use ovirt 4.3 on dell server r640 runing centos 7.7 and a storage bay Dell
Compellent SCv3020 in ISCSI.
We use two 10gb interfaces for iSCSI connection on each dell server.
If we configure ISCSI connection directly from web IU, we can’t specify the two
physical ethernet interface , and there are missing path . (only 4 path on 8)
So, on the shell of hypervisor we use this commands for configure the
connections :
iscsiadm -m iface -I em1 --op=new # 1st ethernet interface
iscsiadm -m iface -I p3p1 --op=new # 2d ethernet interface
iscsiadm -m discovery -t sendtargets -p xx.xx.xx.xx
iscsiadm -m node -o show
iscsiadm -m node --login
after this, on the web IU we can connect our LUN with all path.
Also, I don’t understand how to configure multipath in the web UI . By defaut
the configuration is in failover :
multipath -ll :
36000d3100457e405 dm-3 COMPELNT,Compellent Vol
size=500G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='service-time 0' prio=1 status=active
|- 23:0:0:1 sdb 8:16 active ready running
|- 24:0:0:1 sdd 8:48 active ready running
|- 25:0:0:1 sdc 8:32 active ready running
|- 26:0:0:1 sde 8:64 active ready running
|- 31:0:0:1 sdf 8:80 active ready running
|- 32:0:0:1 sdg 8:96 active ready running
|- 33:0:0:1 sdh 8:112 active ready running
|- 34:0:0:1 sdi 8:128 active ready running
I think round robind or another configuration will be more performent.
So can we made this configuration , select physical interface and configure
multipath in web UI ? for easyly maintenance and adding other server ?
Thank you.
Sylvain.
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