Hi All,
We are trying to understand and study how Swift handles drive failures.
From the book we have learnt that a drive failure triggers replication by
default where as a node failure doesnt. We are trying to study the
performance impact of this replication on the handoff nodes.
If during the replication of an entire partition P to one of the handoff
nodes N1, an object is upload whose 1 of the 3 replicas is destined to node
N1, then is one operation going to have a higher priority ? i.e is does a
normal upload operation take priority over the replication that is in
progress or does it wait for the replication to complete.
Also in the above scenario I do not believe the user experiences much
performance degradation as the proxy server would have recieved the quorum
of successful responses from the other 2 nodes. This brings us to our next
question, what would be the simplest way to quantify the performance
degradation due to a drive failure(maybe multiple) on a Swift setup using
as few drives as possible.
Any help or pointers would be appreciated.
Thank you.
We are trying to understand and study how Swift handles drive failures.
From the book we have learnt that a drive failure triggers replication by
default where as a node failure doesnt. We are trying to study the
performance impact of this replication on the handoff nodes.
If during the replication of an entire partition P to one of the handoff
nodes N1, an object is upload whose 1 of the 3 replicas is destined to node
N1, then is one operation going to have a higher priority ? i.e is does a
normal upload operation take priority over the replication that is in
progress or does it wait for the replication to complete.
Also in the above scenario I do not believe the user experiences much
performance degradation as the proxy server would have recieved the quorum
of successful responses from the other 2 nodes. This brings us to our next
question, what would be the simplest way to quantify the performance
degradation due to a drive failure(maybe multiple) on a Swift setup using
as few drives as possible.
Any help or pointers would be appreciated.
Thank you.