Steve,
I have a couple of questions and concerns about using ZFS in an
environment where the underlying LUNs are replicated at a block
level using products like HDS TrueCopy or EMC SRDF. Apologies in
advance for the length, but I wanted the explanation to be clear.
(I do realise that
Steve McKinty wrote:
I have a couple of questions and concerns about using ZFS in an environment
where the underlying LUNs are replicated at a block level using products like
HDS TrueCopy or EMC SRDF. Apologies in advance for the length, but I wanted
the explanation to be clear.
(I do
Great questions.
1) First issue relates to the überblock. Updates to
it are assumed to be atomic, but if the replication
block size is smaller than the überblock then we
can't guarantee that the whole überblock is
replicated as an entity. That could in theory result
in a corrupt überblock
Steve McKinty wrote:
1) First issue relates to the überblock. Updates to it are assumed to be atomic, but if the replication block size is smaller than the überblock then we can't guarantee that the whole überblock is replicated as an entity. That could in theory result in a corrupt
