[CentOS] iSCSI Question

Digimer lists at alteeve.ca
Sun Nov 18 05:07:02 UTC 2012


On 11/17/2012 10:40 PM, John R Pierce wrote:
> On 11/17/12 6:58 PM, Steven Crothers wrote:
>> On Sat, Nov 17, 2012 at 6:23 PM, Digimer<lists at alteeve.ca>  wrote:
>>
>>>> You could take two nodes, setup DRBD to replicate the data
>>>> (synchronously), manage a floating/virtual IP in pacemaker or rgmanager
>>>> and export the DRBD storage as an iSCSI LUN using tgtd. Then you can
>>>> migrate to the backup node, take down the primary node for maintenance
>>>> and restore with minimal/no downtime. Run this over mode=1 bonding with
>>>> each leg on two different switches and you get network HA as well.
>>>>
>> There is nothing active/active about DRBD though, it also doesn't solve the
>> problem of trying to utilize two heads.
>>
>> It's just failover. Nothing more.
>>
>> I'm looking for an active/active failover scenario, to utilize the multiple
>> physical paths for additional throughput and bandwidth. Yes, I know I can
>> add more nics. More nics doesn't provide failover of the physical node
> 
> 
> any sort of active-active storage system has difficult issues with 
> concurrent operations ...

Exactly what is discussed here, as linked in my other reply;

http://fghaas.wordpress.com/2011/11/29/dual-primary-drbd-iscsi-and-multipath-dont-do-that/

-- 
Digimer
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