[ovirt-users] oVirt/RHEV and HP Blades and HP iSCSI SAN

[Colin Coe]

Hi Dan

I should have mentioned that we need to use the same subnet for both iSCSI
interfaces which is why I ended up bonding (mode 1) these.  Looking at
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.6/html/Administration_Guide/sect-Preparing_and_Adding_Block_Storage.html#Configuring_iSCSI_Multipathing,
it doesn't say anything about tying the iSCSI Bond back to the host.  In
our DEV environment I removed the bond the iSCSI interfaces were using and
created the iSCSI Bond as per this link.  What do I do now?  Recreate the
bond and give it an IP?  I don't see where to put an IP for iSCSI against
the hosts?

Lastly, not using jumbo frames as where a critical infrastructure
organisation and I fear possible side effects.

Thanks

On Sat, Jun 25, 2016 at 10:30 AM, Dan Yasny <dyasny at gmail.com> wrote:

> Two things off the top of my head after skimming the given details:
> 1. iSCSI will work better without the bond. It already uses multipath, so
> all you need is to separate the portal IPs/subnets and provide separate
> IPs/subnets to the iSCSI dedicated NICs, as is the recommended way here:
> https://access.redhat.com/solutions/131153 and also be sure to follow
> this:
> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.6/html/Administration_Guide/sect-Preparing_and_Adding_Block_Storage.html#Configuring_iSCSI_Multipathing
> 2. You haven't mentioned anything about jumbo frames, are you using those?
> If not, it is a very good idea to start.
>
> And 3: since this is RHEV, you might get much more help from the official
> support than from this list.
>
> Hope this helps
> Dan
>
> On Fri, Jun 24, 2016 at 9:12 PM, Colin Coe <colin.coe at gmail.com> wrote:
>
>> Hi all
>>
>> We run four RHEV datacenters, two PROD, one DEV and one TEST/Training.
>> They are all  working OK but I'd like a definitive answer on how I should
>> be configuring the networking side as I'm pretty sure we're getting
>> sub-optimal networking performance.
>>
>> All datacenters are housed in HP C7000 Blade enclosures.  The PROD
>> datacenters use HP 4730 iSCSI SAN clusters, each datacenter has a cluster
>> of two 4730s. These are configured RAID5 internally with NRAID1. The DEV
>> and TEST datacenters are using P4500 iSCSI SANs and each datacenter has a
>> cluster of three P4500s configured with RAID10 internally and NRAID5.
>>
>> The HP C7000 each have two Flex10/10D interconnect modules configured in
>> a redundant ring so that we can upgrade the interconnects without dropping
>> network connectivity to the infrastructure. We use fat RHEL-H 7.2
>> hypervisors (HP BL460) and these are all configured with six network
>> interfaces:
>> - eno1 and eno2 are bond0 which is the rhevm interface
>> - eno3 and eno4 are bond1 and all the VM VLANs are trunked over this bond
>> using 802.1q
>> - eno5 and eno6 are bond2 and dedicated to iSCSI traffic
>>
>> Is this the "correct" way to do this?  If not, what should I be doing
>> instead?
>>
>> Thanks
>>
>> CC
>>
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>>
>
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