On Apr 13, 2010, at 1:17 PM, Yaron Sheffer wrote: > Looks good. A few comments down below. > > Yaron > > On Tue, 2010-04-13 at 11:49 +0300, Yoav Nir wrote: >> >> "Fault Tolerance" is a condition related to high availability, where >> a system maintains service availability, even when a specified set of >> fault conditions occur. In clusters, we expect the system to >> maintain service availability, when one of the cluster members fails. > > one or more
Agreed. Fixed. >> >> "Hot Standby Cluster", or "HS Cluster" is a cluster where only one of >> the members is active at any one time. This member is also referred >> to as the the "active", whereas the others are referred to as "stand- >> bys". [VRRP] is one method of building such a cluster. > > [Please ignore if you're sick and tired of terminology discussions:] I > look at the term "hot standby" as contrasted with "warm/cold > standby" (see http://www.webopedia.com/TERM/H/hot_standby.html). This is > not what we mean here. Can we use "active-standby" instead? I can live with that. What do other think? >> "Failover" is the event where a one member takes over some load from >> some other member. In a hot standby cluster, this hapens when a >> standby memeber becomes active due to a failure of the former active >> member, or because of an administrator command. In a load sharing >> cluster this usually happens because of a failure of one of the >> members, but certain load-balancing technologies may allow a >> particular load (an SA) to move from one member to another to even >> out the load, even without any failures. > > The parenthetical "an SA" implies that SAs are never shared between > members. I suggest that the initial definition of "cluster" mention > whether we expect IKE and IPsec SAs to be shared between members. That is not part of terminology. It's mentioned in section 3. How about I change the parenthetical remark to "such as all the flows associated with a particular SA" ? >> "Loose Cluster" is a cluster where each member has a different IP >> address. Peers find the correct member using some method such as DNS >> queries or [REDIRECT]. > > Upon failure, members' IP addresses are reallocated to other members. They are? _______________________________________________ IPsec mailing list [email protected] https://www.ietf.org/mailman/listinfo/ipsec
