[CentOS] iSCSI Question

Sun Nov 18 03:40:38 UTC 2012
John R Pierce <pierce at hogranch.com>

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 ...

john r pierce                            N 37, W 122
santa cruz ca                         mid-left coast