[CentOS] iSCSI Question

Steven Crothers steven.crothers at gmail.com
Sun Nov 18 05:46:05 UTC 2012


DRBD is not active/active. I cannot utilize both server's as an active
session. DRBD replication latency will, in-fact, break my storage.

I do not want active/passive or "hot-standby" failover... DRBD is offtopic
from my original post, as it is not the correct solution.

Steven Crothers
steven.crothers at gmail.com



On Sun, Nov 18, 2012 at 12:07 AM, Digimer <lists at alteeve.ca> wrote:

> 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
> Papers and Projects: https://alteeve.ca/w/
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